{"id":1774,"date":"2026-03-24T23:51:18","date_gmt":"2026-03-24T23:51:18","guid":{"rendered":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/"},"modified":"2026-03-24T23:51:18","modified_gmt":"2026-03-24T23:51:18","slug":"entities-attributes-relationships-erd-guide","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7: Nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 m\u1ecdi nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n bi\u1ebft"},"content":{"rendered":"

Thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng ph\u1ea7n m\u1ec1m n\u00e0o m\u1ea1nh m\u1ebd. Khi x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t ki\u1ebfn tr\u00fac c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00e0 m\u1ed9t h\u1ed7n lo\u1ea1n d\u1ec5 v\u1ee1 th\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1ch b\u1ea1n t\u1ed5 ch\u1ee9c th\u00f4ng tin. \u1ede trung t\u00e2m c\u1ee7a c\u1ea5u tr\u00fac n\u00e0y l\u00e0 ba tr\u1ee5 c\u1ed9t n\u1ec1n t\u1ea3ng: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. Hi\u1ec3u r\u00f5 c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 t\u00f9y ch\u1ecdn \u0111\u1ed1i v\u1edbi nh\u00e0 ph\u00e1t tri\u1ec3n; \u0111\u00f3 l\u00e0 \u0111i\u1ec1u ki\u1ec7n c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u d\u1ec5 b\u1ea3o tr\u00ec, hi\u1ec7u qu\u1ea3 v\u00e0 h\u1ee3p l\u00fd.<\/p>\n

S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1c c\u1ea5u tr\u00fac n\u00e0y. N\u00f3 tr\u1ef1c quan h\u00f3a c\u00e1ch d\u1eef li\u1ec7u k\u1ebft n\u1ed1i, c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n qua h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n. Kh\u00f4ng n\u1eafm r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i n\u00e0y, ngay c\u1ea3 logic \u1ee9ng d\u1ee5ng ti\u00ean ti\u1ebfn nh\u1ea5t c\u0169ng s\u1ebd g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c ho\u1ea1t \u0111\u1ed9ng. H\u01b0\u1edbng d\u1eabn n\u00e0y ph\u00e2n t\u00edch t\u1eebng y\u1ebfu t\u1ed1 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c, \u0111\u1ea3m b\u1ea3o b\u1ea1n c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u v\u1edbi s\u1ef1 t\u1ef1 tin v\u00e0 r\u00f5 r\u00e0ng.<\/p>\n

\n
\"Hand-drawn<\/figure>\n<\/div>\n

Hi\u1ec3u v\u1ec1 Th\u1ef1c th\u1ec3: N\u1ec1n t\u1ea3ng c\u1ee7a D\u1eef li\u1ec7u \ud83e\uddf1<\/h2>\n

Trong b\u1ed1i c\u1ea3nh thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u, m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m ri\u00eang bi\u1ec7t m\u00e0 b\u1ea1n c\u1ea7n l\u01b0u tr\u1eef th\u00f4ng tin. \u0110\u00f3 l\u00e0 danh t\u1eeb trong m\u00f4 h\u00ecnh d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. H\u00e3y h\u00ecnh dung n\u00f3 nh\u01b0 m\u1ed9t danh m\u1ee5c ho\u1eb7c l\u1edbp c\u00e1c th\u1ee9 t\u1ed3n t\u1ea1i trong th\u1ebf gi\u1edbi th\u1ef1c ho\u1eb7c l\u0129nh v\u1ef1c kinh doanh c\u1ee7a b\u1ea1n. M\u1ed7i th\u1ef1c th\u1ec3 ph\u1ea3i duy nh\u1ea5t v\u00e0 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c trong b\u1ed1i c\u1ea3nh c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

C\u00e1c lo\u1ea1i Th\u1ef1c th\u1ec3<\/h3>\n

C\u00e1c th\u1ef1c th\u1ec3 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng gi\u1ed1ng nhau. Nh\u1eadn di\u1ec7n lo\u1ea1i th\u1ef1c th\u1ec3 m\u00e0 b\u1ea1n \u0111ang x\u1eed l\u00fd s\u1ebd gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t.<\/p>\n

    \n
  • Th\u1ef1c th\u1ec3 m\u1ea1nh:<\/strong> Ch\u00fang t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Ch\u00fang c\u00f3 kh\u00f3a ch\u00ednh ri\u00eang v\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c th\u1ef1c th\u1ec3 kh\u00e1c \u0111\u1ec3 t\u1ed3n t\u1ea1i. V\u00ed d\u1ee5, m\u1ed9t Kh\u00e1ch h\u00e0ng<\/em> ho\u1eb7c m\u1ed9t S\u1ea3n ph\u1ea9m<\/em> c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/li>\n
  • Th\u1ef1c th\u1ec3 y\u1ebfu:<\/strong> Ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t th\u1ef1c th\u1ec3 m\u1ea1nh \u0111\u1ec3 t\u1ed3n t\u1ea1i. Ch\u00fang kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh duy nh\u1ea5t n\u1ebfu kh\u00f4ng c\u00f3 th\u1ef1c th\u1ec3 cha. M\u1ed9t v\u00ed d\u1ee5 kinh \u0111i\u1ec3n l\u00e0 m\u1ed9t Chi ti\u1ebft \u0111\u01a1n h\u00e0ng<\/em> trong m\u1ed9t \u0110\u01a1n h\u00e0ng<\/em>. Kh\u00f4ng c\u00f3 b\u1ed1i c\u1ea3nh \u0111\u01a1n h\u00e0ng, m\u1ee5c n\u00e0y s\u1ebd kh\u00f4ng c\u00f3 \u00fd ngh\u0129a trong l\u01b0\u1ee3c \u0111\u1ed3 c\u1ee5 th\u1ec3 n\u00e0y.<\/li>\n
  • Th\u1ef1c th\u1ec3 li\u00ean k\u1ebft:<\/strong> C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ea3ng li\u00ean k\u1ebft, ch\u00fang gi\u1ea3i quy\u1ebft c\u00e1c m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111a. Ch\u00fang k\u1ebft n\u1ed1i hai th\u1ef1c th\u1ec3 kh\u00e1c \u0111\u1ec3 cho ph\u00e9p nhi\u1ec1u k\u1ebft n\u1ed1i gi\u1eefa ch\u00fang.<\/li>\n<\/ul>\n

    Nh\u1eadn di\u1ec7n Th\u1ef1c th\u1ec3<\/h3>\n

    Khi thi\u1ebft k\u1ebf m\u1ed9t m\u00f4 h\u00ecnh, b\u1ea1n c\u1ea7n t\u1ef1 \u0111\u1eb7t c\u00e2u h\u1ecfi nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ebf gi\u1edbi th\u1ef1c n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c theo d\u00f5i. H\u00e3y t\u00ecm c\u00e1c danh t\u1eeb trong y\u00eau c\u1ea7u kinh doanh c\u1ee7a b\u1ea1n. N\u1ebfu m\u1ed9t quy t\u1eafc kinh doanh y\u00eau c\u1ea7u b\u1ea1n theo d\u00f5i tr\u1ea1ng th\u00e1i, l\u1ecbch s\u1eed ho\u1eb7c thu\u1ed9c t\u00ednh c\u1ee7a th\u1ee9 g\u00ec \u0111\u00f3, th\u00ec th\u1ee9 \u0111\u00f3 c\u00f3 kh\u1ea3 n\u0103ng l\u00e0 m\u1ed9t th\u1ef1c th\u1ec3.<\/p>\n

    H\u00e3y xem x\u00e9t c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau \u0111\u00e2y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t th\u1ef1c th\u1ec3 h\u1ee3p l\u1ec7:<\/p>\n

      \n
    • \u0110\u1ed9c nh\u1ea5t:<\/strong> M\u1ed7i tr\u01b0\u1eddng h\u1ee3p ph\u1ea3i c\u00f3 th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c v\u1edbi m\u1ecdi tr\u01b0\u1eddng h\u1ee3p kh\u00e1c.<\/li>\n
    • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong> \u0110\u1ecbnh ngh\u0129a c\u1ee7a th\u1ef1c th\u1ec3 ph\u1ea3i duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n trong to\u00e0n h\u1ec7 th\u1ed1ng.<\/li>\n
    • T\u00ednh li\u00ean quan:<\/strong> Th\u1ef1c th\u1ec3 \u0111\u00f3 ph\u1ea3i ph\u1ee5c v\u1ee5 m\u1ed9t m\u1ee5c \u0111\u00edch trong logic kinh doanh. Tr\u00e1nh t\u1ea1o c\u00e1c th\u1ef1c th\u1ec3 cho d\u1eef li\u1ec7u \u00edt khi \u0111\u01b0\u1ee3c truy v\u1ea5n ho\u1eb7c s\u1eed d\u1ee5ng.<\/li>\n<\/ul>\n

      Thu\u1ed9c t\u00ednh: X\u00e1c \u0111\u1ecbnh c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a th\u1ef1c th\u1ec3 \ud83d\udd11<\/h2>\n

      Sau khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c th\u1ef1c th\u1ec3, b\u1ea1n c\u1ea7n m\u00f4 t\u1ea3 ch\u00fang. Thu\u1ed9c t\u00ednh l\u00e0 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m, thu\u1ed9c t\u00ednh ho\u1eb7c chi ti\u1ebft m\u00f4 t\u1ea3 m\u1ed9t th\u1ef1c th\u1ec3. N\u1ebfu m\u1ed9t th\u1ef1c th\u1ec3 l\u00e0 m\u1ed9t b\u1ea3ng, th\u00ec m\u1ed9t thu\u1ed9c t\u00ednh l\u00e0 m\u1ed9t c\u1ed9t. C\u00f9ng nhau, ch\u00fang t\u1ea1o n\u00ean b\u1ee9c tranh to\u00e0n di\u1ec7n v\u1ec1 d\u1eef li\u1ec7u m\u00e0 b\u1ea1n \u0111ang qu\u1ea3n l\u00fd.<\/p>\n

      Kh\u00f3a ch\u00ednh v\u00e0 kh\u00f3a ngo\u1ea1i<\/h3>\n

      Kh\u00f4ng ph\u1ea3i m\u1ecdi thu\u1ed9c t\u00ednh n\u00e0o c\u0169ng c\u00f3 gi\u00e1 tr\u1ecb nh\u01b0 nhau. M\u1ed9t s\u1ed1 \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c b\u1ea3o to\u00e0n t\u00ednh to\u00e0n v\u1eb9n v\u00e0 li\u00ean k\u1ebft d\u1eef li\u1ec7u.<\/p>\n

        \n
      • Kh\u00f3a ch\u00ednh (PK):<\/strong> M\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t cho m\u1ed9t b\u1ea3n ghi trong m\u1ed9t th\u1ef1c th\u1ec3. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng kh\u00f4ng c\u00f3 hai h\u00e0ng n\u00e0o gi\u1ed1ng nhau. Kh\u00f3a ch\u00ednh c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t c\u1ed9t duy nh\u1ea5t (nh\u01b0 m\u1ed9t s\u1ed1 ID) ho\u1eb7c m\u1ed9t kh\u00f3a k\u1ebft h\u1ee3p g\u1ed3m nhi\u1ec1u c\u1ed9t.<\/li>\n
      • Kh\u00f3a ngo\u1ea1i (FK):<\/strong> M\u1ed9t thu\u1ed9c t\u00ednh li\u00ean k\u1ebft \u0111\u1ebfn kh\u00f3a ch\u00ednh c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c. \u0110i\u1ec1u n\u00e0y thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c b\u1ea3ng. N\u00f3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu, \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t b\u1ea3n ghi trong m\u1ed9t b\u1ea3ng kh\u00f4ng th\u1ec3 tham chi\u1ebfu \u0111\u1ebfn m\u1ed9t b\u1ea3n ghi kh\u00f4ng t\u1ed3n t\u1ea1i trong b\u1ea3ng kh\u00e1c.<\/li>\n<\/ul>\n

        Ph\u00e2n lo\u1ea1i thu\u1ed9c t\u00ednh<\/h3>\n

        C\u00e1c thu\u1ed9c t\u00ednh kh\u00e1c nhau v\u1ec1 c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 tr\u00edch xu\u1ea5t. Hi\u1ec3u r\u00f5 nh\u1eefng kh\u00e1c bi\u1ec7t n\u00e0y gi\u00fap t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 hi\u1ec7u su\u1ea5t truy v\u1ea5n.<\/p>\n\n\n\n\n\n\n\n\n
        Lo\u1ea1i<\/th>\nM\u00f4 t\u1ea3<\/th>\nV\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
        \u0110\u01a1n gi\u1ea3n<\/td>\nKh\u00f4ng th\u1ec3 chia nh\u1ecf h\u01a1n n\u1eefa. N\u00f3 l\u00e0 nguy\u00ean t\u1eed.<\/td>\nS\u1ed1 \u0111i\u1ec7n tho\u1ea1i<\/td>\n<\/tr>\n
        H\u1ee3p th\u00e0nh<\/td>\nC\u00f3 th\u1ec3 chia th\u00e0nh c\u00e1c ph\u1ea7n con.<\/td>\n\u0110\u1ecba ch\u1ec9 (\u0110\u01b0\u1eddng, Th\u00e0nh ph\u1ed1, M\u00e3 b\u01b0u ch\u00ednh)<\/td>\n<\/tr>\n
        Nhi\u1ec1u gi\u00e1 tr\u1ecb<\/td>\nC\u00f3 th\u1ec3 l\u01b0u tr\u1eef nhi\u1ec1u gi\u00e1 tr\u1ecb cho m\u1ed9t th\u1ec3 hi\u1ec7n th\u1ef1c th\u1ec3 duy nh\u1ea5t.<\/td>\n\u0110\u1ecba ch\u1ec9 email<\/td>\n<\/tr>\n
        \u0110\u01b0\u1ee3c suy ra<\/td>\nT\u00ednh to\u00e1n t\u1eeb c\u00e1c thu\u1ed9c t\u00ednh kh\u00e1c.<\/td>\nTu\u1ed5i (\u0110\u01b0\u1ee3c suy ra t\u1eeb ng\u00e0y sinh)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho thu\u1ed9c t\u00ednh<\/h3>\n

        Khi \u0111\u1ecbnh ngh\u0129a thu\u1ed9c t\u00ednh, h\u00e3y l\u01b0u \u00fd c\u00e1c h\u01b0\u1edbng d\u1eabn sau \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng d\u1eef li\u1ec7u:<\/p>\n

          \n
        • S\u1eed d\u1ee5ng t\u00ean m\u00f4 t\u1ea3:<\/strong> Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c t\u00ean chung chung nh\u01b0 \"col1\"<\/code> ho\u1eb7c d\u1eef li\u1ec7u<\/code>. S\u1eed d\u1ee5ng t\u00ean gi\u1ea3i th\u00edch n\u1ed9i dung, v\u00ed d\u1ee5 nh\u01b0 email_khach_hang<\/code> ho\u1eb7c ngay_dat_hang<\/code>.<\/li>\n
        • X\u00e1c \u0111\u1ecbnh ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> H\u00e3y ch\u00ednh x\u00e1c. S\u1eed d\u1ee5ng s\u1ed1 nguy\u00ean cho c\u00e1c con s\u1ed1 \u0111\u1ebfm, ng\u00e0y th\u00e1ng cho d\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn th\u1eddi gian, v\u00e0 chu\u1ed7i k\u00fd t\u1ef1 cho v\u0103n b\u1ea3n. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh l\u1ed7i khi nh\u1eadp v\u00e0 truy xu\u1ea5t d\u1eef li\u1ec7u.<\/li>\n
        • T\u1ed1i thi\u1ec3u h\u00f3a gi\u00e1 tr\u1ecb r\u1ed7ng:<\/strong> \u1ede m\u1ee9c \u0111\u1ed9 c\u00f3 th\u1ec3, \u00e1p d\u1ee5ng r\u00e0ng bu\u1ed9c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng b\u1ecb b\u1ecf tr\u1ed1ng. C\u00e1c gi\u00e1 tr\u1ecb r\u1ed7ng c\u00f3 th\u1ec3 l\u00e0m ph\u1ee9c t\u1ea1p c\u00e1c truy v\u1ea5n v\u00e0 d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 kh\u00f4ng mong mu\u1ed1n.<\/li>\n
        • Chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u:<\/strong> \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c thu\u1ed9c t\u00ednh ch\u1ec9 ph\u1ee5 thu\u1ed9c v\u00e0o kh\u00f3a ch\u00ednh. Tr\u00e1nh l\u01b0u tr\u1eef d\u1eef li\u1ec7u c\u00f3 th\u1ec3 suy ra ho\u1eb7c di chuy\u1ec3n sang th\u1ef1c th\u1ec3 kh\u00e1c.<\/li>\n<\/ul>\n

          M\u1ed1i quan h\u1ec7: K\u1ebft n\u1ed1i c\u00e1c \u0111i\u1ec3m \ud83d\udd17<\/h2>\n

          C\u00e1c th\u1ef1c th\u1ec3 hi\u1ebfm khi t\u1ed3n t\u1ea1i ri\u00eang l\u1ebb. M\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Ch\u00fang quy \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c li\u00ean k\u1ebft, c\u00e1ch c\u00e1c truy v\u1ea5n \u0111\u01b0\u1ee3c n\u1ed1i, v\u00e0 c\u00e1ch b\u1ea3o to\u00e0n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u trong to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1ed9t c\u1ea5u tr\u00fac m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t s\u1ebd ng\u0103n ng\u1eeba s\u1ef1 tr\u00f9ng l\u1eb7p d\u1eef li\u1ec7u v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c c\u1eadp nh\u1eadt \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i ch\u00ednh x\u00e1c.<\/p>\n

          S\u1ed1 l\u01b0\u1ee3ng<\/h3>\n

          S\u1ed1 l\u01b0\u1ee3ng x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 s\u1ed1 h\u1ecdc gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi: \u201cC\u00f3 bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean quan \u0111\u1ebfn bao nhi\u00eau th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B?\u201d<\/p>\n

            \n
          • M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean quan \u0111\u1ebfn \u0111\u00fang m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. \u0110i\u1ec1u n\u00e0y hi\u1ebfm x\u1ea3y ra nh\u01b0ng xu\u1ea5t hi\u1ec7n trong c\u00e1c t\u00ecnh hu\u1ed1ng nh\u01b0 m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 m\u1ed9t h\u1ed3 s\u01a1.<\/li>\n
          • M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean quan \u0111\u1ebfn nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. V\u00ed d\u1ee5, m\u1ed9t Ph\u00f2ng ban<\/em> c\u00f3 nhi\u1ec1u Nh\u00e2n vi\u00ean<\/em>.<\/li>\n
          • Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N):<\/strong> Nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean quan \u0111\u1ebfn nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. V\u00ed d\u1ee5, m\u1ed9t Sinh vi\u00ean<\/em> c\u00f3 th\u1ec3 \u0111\u0103ng k\u00fd v\u00e0o nhi\u1ec1u Kh\u00f3a h\u1ecdc<\/em>, v\u00e0 m\u1ed9t Kh\u00f3a h\u1ecdc<\/em> c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u Sinh vi\u00ean<\/em>.<\/li>\n<\/ul>\n

            C\u00e1c r\u00e0ng bu\u1ed9c tham gia<\/h3>\n

            Cardinality cho b\u1ea1n bi\u1ebft s\u1ed1 l\u01b0\u1ee3ng, nh\u01b0ng c\u00e1c r\u00e0ng bu\u1ed9c tham gia cho b\u1ea1n bi\u1ebft m\u1ed1i quan h\u1ec7 c\u00f3 b\u1eaft bu\u1ed9c hay kh\u00f4ng.<\/p>\n

              \n
            • Tham gia to\u00e0n b\u1ed9:<\/strong> M\u1ed7i th\u1ef1c th\u1ec3 ph\u1ea3i tham gia v\u00e0o m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, m\u1ed7i \u0110\u01a1n h\u00e0ng<\/em> ph\u1ea3i c\u00f3 m\u1ed9t Kh\u00e1ch h\u00e0ng<\/em>.<\/li>\n
            • Tham gia m\u1ed9t ph\u1ea7n:<\/strong> M\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 tham gia ho\u1eb7c kh\u00f4ng tham gia v\u00e0o m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, m\u1ed9t Kh\u00e1ch h\u00e0ng<\/em> c\u00f3 th\u1ec3 c\u00f3 ho\u1eb7c kh\u00f4ng c\u00f3 m\u1ed9t \u0110\u01a1n h\u00e0ng<\/em> v\u00e0o m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh.<\/li>\n<\/ul>\n

              Chi\u1ebfn l\u01b0\u1ee3c tri\u1ec3n khai<\/h3>\n

              C\u00e1c cardinalities kh\u00e1c nhau y\u00eau c\u1ea7u c\u00e1c chi\u1ebfn l\u01b0\u1ee3c tri\u1ec3n khai kh\u00e1c nhau trong m\u00f4 h\u00ecnh d\u1eef li\u1ec7u.<\/p>\n\n\n\n\n\n\n\n
              Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\nPh\u01b0\u01a1ng ph\u00e1p tri\u1ec3n khai<\/th>\nV\u00ed d\u1ee5 t\u00ecnh hu\u1ed1ng<\/th>\n<\/tr>\n<\/thead>\n
              1:1<\/td>\nG\u1ed9p c\u00e1c b\u1ea3ng ho\u1eb7c th\u00eam kh\u00f3a ngo\u1ea1i v\u00e0o m\u1ed9t b\u00ean.<\/td>\nH\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng li\u00ean k\u1ebft v\u1edbi t\u00e0i kho\u1ea3n ng\u01b0\u1eddi d\u00f9ng.<\/td>\n<\/tr>\n
              1:N<\/td>\nTh\u00eam kh\u00f3a ngo\u1ea1i v\u00e0o b\u1ea3ng b\u00ean \u201cnhi\u1ec1u\u201d.<\/td>\nB\u1ea3ng Nh\u00e2n vi\u00ean c\u00f3 m\u1ed9t Dept_ID.<\/td>\n<\/tr>\n
              M:N<\/td>\nT\u1ea1o m\u1ed9t b\u1ea3ng giao nhau v\u1edbi hai kh\u00f3a ngo\u1ea1i.<\/td>\nB\u1ea3ng \u0111\u0103ng k\u00fd k\u1ebft n\u1ed1i gi\u1eefa H\u1ecdc sinh v\u00e0 Kh\u00f3a h\u1ecdc.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Chu\u1ea9n h\u00f3a: C\u1ea5u tr\u00fac h\u00f3a \u0111\u1ec3 \u1ed5n \u0111\u1ecbnh \ud83d\udcd0<\/h2>\n

              Trong khi c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 t\u1ea1o n\u00ean c\u1ea5u tr\u00fac, th\u00ec chu\u1ea9n h\u00f3a t\u1ed5 ch\u1ee9c l\u1ea1i c\u1ea5u tr\u00fac \u0111\u00f3 \u0111\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n. Chu\u1ea9n h\u00f3a l\u00e0 m\u1ed9t chu\u1ed7i c\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c ph\u1ee5 thu\u1ed9c d\u1eef li\u1ec7u l\u00e0 h\u1ee3p l\u00fd.<\/p>\n

              D\u1ea1ng chu\u1ea9n th\u1ee9 nh\u1ea5t (1NF)<\/h3>\n

              Trong 1NF, m\u1ecdi c\u1ed9t ph\u1ea3i ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb nguy\u00ean t\u1eed. B\u1ea1n kh\u00f4ng th\u1ec3 l\u01b0u tr\u1eef m\u1ed9t danh s\u00e1ch c\u00e1c gi\u00e1 tr\u1ecb trong m\u1ed9t \u00f4 duy nh\u1ea5t. M\u1ed7i h\u00e0ng ph\u1ea3i l\u00e0 duy nh\u1ea5t, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o b\u1edfi kh\u00f3a ch\u00ednh. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf c\u00e1c nh\u00f3m l\u1eb7p l\u1ea1i.<\/p>\n

              D\u1ea1ng chu\u1ea9n th\u1ee9 hai (2NF)<\/h3>\n

              Sau khi \u0111\u1ea1t \u0111\u01b0\u1ee3c 1NF, 2NF \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a \u0111\u1ec1u ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o kh\u00f3a ch\u00ednh. N\u1ebfu b\u1ea1n c\u00f3 kh\u00f3a h\u1ee3p th\u00e0nh, m\u1ecdi thu\u1ed9c t\u00ednh ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o to\u00e0n b\u1ed9 kh\u00f3a, ch\u1ee9 kh\u00f4ng ch\u1ec9 m\u1ed9t ph\u1ea7n c\u1ee7a n\u00f3.<\/p>\n

              D\u1ea1ng chu\u1ea9n th\u1ee9 ba (3NF)<\/h3>\n

              3NF lo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u. C\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00e1c. V\u00ed d\u1ee5, n\u1ebfu Th\u00e0nh ph\u1ed1<\/em> ph\u1ee5 thu\u1ed9c v\u00e0o M\u00e3 b\u01b0u ch\u00ednh<\/em>, v\u00e0 M\u00e3 b\u01b0u ch\u00ednh<\/em> ph\u1ee5 thu\u1ed9c v\u00e0o M\u00e3 kh\u00e1ch h\u00e0ng<\/em>, th\u00ec Th\u00e0nh ph\u1ed1<\/em> ph\u1ee5 thu\u1ed9c v\u00e0o M\u00e3 kh\u00e1ch h\u00e0ng<\/em> m\u1ed9t c\u00e1ch b\u1eafc c\u1ea7u. \u0110\u1ec3 kh\u1eafc ph\u1ee5c \u0111i\u1ec1u n\u00e0y, di chuy\u1ec3n Th\u00e0nh ph\u1ed1<\/em> sang m\u1ed9t th\u1ef1c th\u1ec3 ri\u00eang bi\u1ec7t ho\u1eb7c \u0111\u1ea3m b\u1ea3o n\u00f3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp v\u1edbi kh\u00f3a.<\/p>\n

              Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong thi\u1ebft k\u1ebf \u26a0\ufe0f<\/h2>\n

              Ngay c\u1ea3 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m khi thi\u1ebft k\u1ebf m\u00f4 h\u00ecnh d\u1eef li\u1ec7u. Vi\u1ec7c nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m r\u1ea5t nhi\u1ec1u th\u1eddi gian trong giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n.<\/p>\n

                \n
              • Chu\u1ea9n h\u00f3a qu\u00e1 m\u1ee9c:<\/strong>Chia d\u1eef li\u1ec7u th\u00e0nh qu\u00e1 nhi\u1ec1u th\u1ef1c th\u1ec3 nh\u1ecf c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1c truy v\u1ea5n tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p v\u00e0 ch\u1eadm. \u0110\u00f4i khi, vi\u1ec7c kh\u00f4ng chu\u1ea9n h\u00f3a l\u00e0 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi c\u00e1c t\u00e1c v\u1ee5 \u0111\u1ecdc d\u1eef li\u1ec7u nhi\u1ec1u.<\/li>\n
              • Chu\u1ea9n h\u00f3a ch\u01b0a \u0111\u1ee7:<\/strong>L\u01b0u tr\u1eef c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u \u1edf nhi\u1ec1u n\u01a1i d\u1eabn \u0111\u1ebfn s\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n. N\u1ebfu \u0111\u1ecba ch\u1ec9 kh\u00e1ch h\u00e0ng thay \u0111\u1ed5i, b\u1ea1n ph\u1ea3i c\u1eadp nh\u1eadt n\u00f3 trong m\u1ecdi b\u1ea3n ghi. \u0110i\u1ec1u n\u00e0y l\u00e0m t\u0103ng nguy c\u01a1 l\u1ed7i.<\/li>\n
              • B\u1ecf qua ki\u1ec3u d\u1eef li\u1ec7u:<\/strong>S\u1eed d\u1ee5ng chu\u1ed7i cho s\u1ed1 ho\u1eb7c ng\u00e0y th\u00e1ng d\u1eabn \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 s\u1eafp x\u1ebfp v\u00e0 l\u1ed7i x\u00e1c th\u1ef1c. Lu\u00f4n kh\u1edbp ki\u1ec3u thu\u1ed9c t\u00ednh v\u1edbi d\u1eef li\u1ec7u th\u1ef1c t\u1ebf.<\/li>\n
              • Gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c ghi c\u1ee9ng:<\/strong>Tr\u00e1nh l\u01b0u m\u00e3 tr\u1ea1ng th\u00e1i d\u01b0\u1edbi d\u1ea1ng chu\u1ed7i n\u1ebfu ch\u00fang c\u00f3 \u00fd ngh\u0129a c\u1ee5 th\u1ec3. S\u1eed d\u1ee5ng b\u1ea3ng tham chi\u1ebfu cho c\u00e1c gi\u00e1 tr\u1ecb nh\u01b0 \u201cTr\u1ea1ng th\u00e1i\u201d ho\u1eb7c \u201cQu\u1ed1c gia\u201d \u0111\u1ec3 duy tr\u00ec s\u1ef1 nh\u1ea5t qu\u00e1n.<\/li>\n
              • Thi\u1ebfu ch\u1ec9 m\u1ee5c:<\/strong>C\u00e1c kh\u00f3a ngo\u1ea1i v\u00e0 c\u00e1c thu\u1ed9c t\u00ednh th\u01b0\u1eddng \u0111\u01b0\u1ee3c truy v\u1ea5n n\u00ean \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 tra c\u1ee9u. Thi\u1ebfu ch\u1ec9 m\u1ee5c, c\u00e1c thao t\u00e1c n\u1ed1i (join) c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn.<\/li>\n<\/ul>\n

                C\u00e1c c\u00e2n nh\u1eafc n\u00e2ng cao cho kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng \ud83d\ude80<\/h2>\n

                Khi \u1ee9ng d\u1ee5ng ph\u00e1t tri\u1ec3n, m\u00f4 h\u00ecnh d\u1eef li\u1ec7u ph\u1ea3i ti\u1ebfn h\u00f3a theo. C\u00e1c quy\u1ebft \u0111\u1ecbnh thi\u1ebft k\u1ebf ban \u0111\u1ea7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng h\u1ec7 th\u1ed1ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng c\u00e2n nh\u1eafc cho s\u1ef1 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i.<\/p>\n

                X\u1eed l\u00fd d\u1eef li\u1ec7u l\u1ecbch s\u1eed<\/h3>\n

                C\u00e1c quy t\u1eafc kinh doanh thay \u0111\u1ed5i theo th\u1eddi gian. C\u00e1c thu\u1ed9c t\u00ednh t\u1eebng b\u1eaft bu\u1ed9c c\u00f3 th\u1ec3 tr\u1edf n\u00ean t\u00f9y ch\u1ecdn. C\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 thay \u0111\u1ed5i. Thay v\u00ec li\u00ean t\u1ee5c thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3, h\u00e3y c\u00e2n nh\u1eafc th\u00eam c\u00e1c c\u1ed9t l\u01b0u tr\u1eef l\u1ecbch s\u1eed ho\u1eb7c s\u1eed d\u1ee5ng b\u1ea3ng th\u1eddi gian \u0111\u1ec3 theo d\u00f5i thay \u0111\u1ed5i theo th\u1eddi gian. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea1n ki\u1ec3m to\u00e1n c\u00e1c thay \u0111\u1ed5i m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng ch\u1ee9c n\u0103ng hi\u1ec7n t\u1ea1i.<\/p>\n

                B\u1ea3o m\u1eadt v\u00e0 ki\u1ec3m so\u00e1t truy c\u1eadp<\/h3>\n

                C\u00e1c th\u1ef1c th\u1ec3 th\u01b0\u1eddng ch\u1ee9a th\u00f4ng tin nh\u1ea1y c\u1ea3m. Thi\u1ebft k\u1ebf c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a b\u1ea1n \u0111\u1ec3 h\u1ed7 tr\u1ee3 ki\u1ec3m so\u00e1t truy c\u1eadp. V\u00ed d\u1ee5, t\u00e1ch bi\u1ec7t d\u1eef li\u1ec7u Ng\u01b0\u1eddi d\u00f9ng<\/em> d\u1eef li\u1ec7u kh\u1ecfi Nh\u1eadt k\u00fd<\/em> d\u1eef li\u1ec7u c\u00f3 th\u1ec3 gi\u00fap qu\u1ea3n l\u00fd quy\u1ec1n h\u1ea1n. \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c kh\u00f3a ngo\u1ea1i kh\u00f4ng ti\u1ebft l\u1ed9 d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m v\u1edbi ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p.<\/p>\n

                Hi\u1ec7u su\u1ea5t truy v\u1ea5n<\/h3>\n

                C\u00e1ch b\u1ea1n c\u1ea5u tr\u00fac c\u00e1c m\u1ed1i quan h\u1ec7 tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t truy v\u1ea5n. C\u00e1c m\u1ed1i quan h\u1ec7 l\u1ed3ng gh\u00e9p s\u00e2u y\u00eau c\u1ea7u nhi\u1ec1u thao t\u00e1c n\u1ed1i, c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm vi\u1ec7c truy xu\u1ea5t d\u1eef li\u1ec7u. Ph\u00e2n t\u00edch c\u00e1c truy v\u1ea5n th\u01b0\u1eddng xuy\u00ean nh\u1ea5t v\u00e0 c\u1ea5u tr\u00fac c\u00e1c th\u1ef1c th\u1ec3 \u0111\u1ec3 t\u1ed1i thi\u1ec3u h\u00f3a s\u1ed1 l\u01b0\u1ee3ng n\u1ed1i c\u1ea7n thi\u1ebft. \u0110\u00f4i khi, lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a m\u1ed9t s\u1ed1 thu\u1ed9c t\u00ednh v\u00e0o kho l\u01b0u tr\u1eef t\u1ed1i \u01b0u cho \u0111\u1ecdc l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1eafn.<\/p>\n

                K\u1ebft lu\u1eadn \ud83c\udfc1<\/h2>\n

                Th\u00e0nh th\u1ea1o c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i v\u1ec1 th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 l\u00e0 m\u1ed9t h\u00e0nh tr\u00ecnh k\u00e9o d\u00e0i su\u1ed1t s\u1ef1 nghi\u1ec7p c\u1ee7a b\u1ea1n. Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m l\u00fd thuy\u1ebft; ch\u00fang l\u00e0 c\u00f4ng c\u1ee5 th\u1ef1c t\u1ebf b\u1ea1n d\u00f9ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, t\u00ednh to\u00e0n v\u1eb9n v\u00e0 hi\u1ec7u qu\u1ea3, b\u1ea1n s\u1ebd t\u1ea1o ra c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u h\u1ed7 tr\u1ee3 \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh trong nhi\u1ec1u n\u0103m t\u1edbi.<\/p>\n

                B\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng \u0111i\u1ec1u c\u01a1 b\u1ea3n. X\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng c\u00e1c th\u1ef1c th\u1ec3 c\u1ee7a b\u1ea1n. G\u00e1n c\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 ch\u00ednh x\u00e1c ch\u00fang. X\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ea3n \u00e1nh \u0111\u00fang t\u01b0\u01a1ng t\u00e1c trong th\u1ebf gi\u1edbi th\u1ef1c. Khi b\u1ea1n tinh ch\u1ec9nh c\u00e1c thi\u1ebft k\u1ebf n\u00e0y, b\u1ea1n s\u1ebd nh\u1eadn th\u1ea5y logic c\u1ee7a \u1ee9ng d\u1ee5ng tr\u1edf n\u00ean s\u1ea1ch s\u1ebd v\u00e0 v\u1eefng ch\u1eafc h\u01a1n. H\u00e3y nh\u1edb r\u1eb1ng m\u1ed9t thi\u1ebft k\u1ebf t\u1ed1t l\u00e0 thi\u1ebft k\u1ebf d\u1ec5 hi\u1ec3u v\u00e0 d\u1ec5 thay \u0111\u1ed5i. H\u00e3y ghi nh\u1edb nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y khi b\u1ea1n ti\u1ebfp t\u1ee5c c\u00f4ng vi\u1ec7c ph\u00e1t tri\u1ec3n.<\/p>\n

                \u0110\u1ea7u t\u01b0 th\u1eddi gian v\u00e0o thi\u1ebft k\u1ebf ERD ph\u00f9 h\u1ee3p s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch r\u00f5 r\u1ec7t trong vi\u1ec7c gi\u1ea3m l\u1ed7i, r\u00fat ng\u1eafn chu k\u1ef3 ph\u00e1t tri\u1ec3n v\u00e0 t\u1ea1o ra m\u00e3 ngu\u1ed3n d\u1ec5 b\u1ea3o tr\u00ec h\u01a1n. D\u00f9 b\u1ea1n \u0111ang x\u00e2y d\u1ef1ng m\u1ed9t c\u00f4ng c\u1ee5 nh\u1ecf hay m\u1ed9t h\u1ec7 th\u1ed1ng doanh nghi\u1ec7p quy m\u00f4 l\u1edbn, c\u00e1c quy t\u1eafc v\u1ec1 th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 v\u1eabn nh\u01b0 nhau. H\u00e3y tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n, v\u00e0 ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n s\u1ebd v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

                Thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng ph\u1ea7n m\u1ec1m n\u00e0o m\u1ea1nh m\u1ebd. Khi x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd d\u1eef li\u1ec7u ph\u1ee9c…<\/p>\n","protected":false},"author":1,"featured_media":1775,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[86],"tags":[82,85],"class_list":["post-1774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nTh\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-24T23:51:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1664\" \/>\n\t<meta property=\"og:image:height\" content=\"928\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"vpadmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"vpadmin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"21 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\"},\"author\":{\"name\":\"vpadmin\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/05a897b07530dd5607bd8a29719b1d6c\"},\"headline\":\"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7: Nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 m\u1ecdi nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n bi\u1ebft\",\"datePublished\":\"2026-03-24T23:51:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\"},\"wordCount\":4241,\"publisher\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg\",\"keywords\":[\"academic\",\"erd\"],\"articleSection\":[\"ERD\"],\"inLanguage\":\"vi\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\",\"url\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\",\"name\":\"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n\",\"isPartOf\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg\",\"datePublished\":\"2026-03-24T23:51:18+00:00\",\"description\":\"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#breadcrumb\"},\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage\",\"url\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg\",\"contentUrl\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg\",\"width\":1664,\"height\":928},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.go-diagram.com\/vi\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7: Nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 m\u1ecdi nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n bi\u1ebft\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#website\",\"url\":\"https:\/\/www.go-diagram.com\/vi\/\",\"name\":\"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.go-diagram.com\/vi\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"vi\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#organization\",\"name\":\"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods\",\"url\":\"https:\/\/www.go-diagram.com\/vi\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/go-diagram-logo.png\",\"contentUrl\":\"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/go-diagram-logo.png\",\"width\":340,\"height\":62,\"caption\":\"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods\"},\"image\":{\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/05a897b07530dd5607bd8a29719b1d6c\",\"name\":\"vpadmin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"vi\",\"@id\":\"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g\",\"caption\":\"vpadmin\"},\"sameAs\":[\"https:\/\/www.go-diagram.com\"],\"url\":\"https:\/\/www.go-diagram.com\/vi\/author\/vpadmin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n","description":"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/","og_locale":"vi_VN","og_type":"article","og_title":"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n","og_description":"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.","og_url":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/","og_site_name":"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods","article_published_time":"2026-03-24T23:51:18+00:00","og_image":[{"width":1664,"height":928,"url":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg","type":"image\/jpeg"}],"author":"vpadmin","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"vpadmin","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"21 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#article","isPartOf":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/"},"author":{"name":"vpadmin","@id":"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/05a897b07530dd5607bd8a29719b1d6c"},"headline":"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7: Nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 m\u1ecdi nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n bi\u1ebft","datePublished":"2026-03-24T23:51:18+00:00","mainEntityOfPage":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/"},"wordCount":4241,"publisher":{"@id":"https:\/\/www.go-diagram.com\/vi\/#organization"},"image":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg","keywords":["academic","erd"],"articleSection":["ERD"],"inLanguage":"vi"},{"@type":"WebPage","@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/","url":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/","name":"Th\u1ef1c th\u1ec3, Thu\u1ed9c t\u00ednh, M\u1ed1i quan h\u1ec7: H\u01b0\u1edbng d\u1eabn ERD cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n","isPartOf":{"@id":"https:\/\/www.go-diagram.com\/vi\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage"},"image":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg","datePublished":"2026-03-24T23:51:18+00:00","description":"H\u1ecdc c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i c\u1ee7a ERD: th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt to\u00e0n di\u1ec7n cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eefng ch\u1eafc.","breadcrumb":{"@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#breadcrumb"},"inLanguage":"vi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/"]}]},{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#primaryimage","url":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg","contentUrl":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2026\/03\/entities-attributes-relationships-database-design-whiteboard-infographic.jpg","width":1664,"height":928},{"@type":"BreadcrumbList","@id":"https:\/\/www.go-diagram.com\/vi\/entities-attributes-relationships-erd-guide\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.go-diagram.com\/vi\/"},{"@type":"ListItem","position":2,"name":"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh, m\u1ed1i quan h\u1ec7: Nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 m\u1ecdi nh\u00e0 ph\u00e1t tri\u1ec3n c\u1ea7n bi\u1ebft"}]},{"@type":"WebSite","@id":"https:\/\/www.go-diagram.com\/vi\/#website","url":"https:\/\/www.go-diagram.com\/vi\/","name":"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods","description":"","publisher":{"@id":"https:\/\/www.go-diagram.com\/vi\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.go-diagram.com\/vi\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"vi"},{"@type":"Organization","@id":"https:\/\/www.go-diagram.com\/vi\/#organization","name":"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods","url":"https:\/\/www.go-diagram.com\/vi\/","logo":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.go-diagram.com\/vi\/#\/schema\/logo\/image\/","url":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/go-diagram-logo.png","contentUrl":"https:\/\/www.go-diagram.com\/vi\/wp-content\/uploads\/sites\/10\/2025\/03\/go-diagram-logo.png","width":340,"height":62,"caption":"Go Diagram Vietnamese - Proven AI Workflows & Modern Tech Methods"},"image":{"@id":"https:\/\/www.go-diagram.com\/vi\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/05a897b07530dd5607bd8a29719b1d6c","name":"vpadmin","image":{"@type":"ImageObject","inLanguage":"vi","@id":"https:\/\/www.go-diagram.com\/vi\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/56e0eb902506d9cea7c7e209205383146b8e81c0ef2eff693d9d5e0276b3d7e3?s=96&d=mm&r=g","caption":"vpadmin"},"sameAs":["https:\/\/www.go-diagram.com"],"url":"https:\/\/www.go-diagram.com\/vi\/author\/vpadmin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/posts\/1774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/comments?post=1774"}],"version-history":[{"count":0,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/posts\/1774\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/media\/1775"}],"wp:attachment":[{"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/media?parent=1774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/categories?post=1774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.go-diagram.com\/vi\/wp-json\/wp\/v2\/tags?post=1774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}