{"id":1584,"date":"2026-03-23T12:11:15","date_gmt":"2026-03-23T12:11:15","guid":{"rendered":"https:\/\/www.go-diagram.com\/vi\/erd-practice-problems-realistic-scenarios\/"},"modified":"2026-03-23T12:11:15","modified_gmt":"2026-03-23T12:11:15","slug":"erd-practice-problems-realistic-scenarios","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/vi\/erd-practice-problems-realistic-scenarios\/","title":{"rendered":"B\u00e0i t\u1eadp ERD: T\u0103ng s\u1ef1 t\u1ef1 tin v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf"},"content":{"rendered":"

Thi\u1ebft k\u1ebf m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd \u0111\u00f2i h\u1ecfi h\u01a1n c\u1ea3 vi\u1ec7c hi\u1ec3u ng\u1eef ph\u00e1p. N\u00f3 \u0111\u00f2i h\u1ecfi m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u t\u01b0\u01a1ng t\u00e1c trong m\u1ed9t h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf. C\u00e1c 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\u1ea5u tr\u00fac n\u00e0y. Kh\u00f4ng c\u00f3 th\u1ef1c h\u00e0nh, c\u00e1c kh\u00e1i ni\u1ec7m l\u00fd thuy\u1ebft v\u1ec1 chu\u1ea9n h\u00f3a, b\u1ed9i s\u1ed1 v\u00e0 kh\u00f3a ngo\u1ea1i v\u1eabn ch\u1ec9 l\u00e0 tr\u1eebu t\u01b0\u1ee3ng. \u0110\u1ec3 th\u1ef1c s\u1ef1 n\u1eafm v\u1eefng m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u, b\u1ea1n ph\u1ea3i tham gia v\u00e0o c\u00e1c b\u00e0i to\u00e1n th\u1ef1c t\u1ebf m\u00f4 ph\u1ecfng logic kinh doanh th\u1ef1c t\u1ebf.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y t\u1eadp trung v\u00e0o vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc ERD th\u00f4ng qua c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 v\u00e0 th\u1ef1c t\u1ebf. B\u1eb1ng c\u00e1ch l\u00e0m qua c\u00e1c v\u00ed d\u1ee5 n\u00e0y, b\u1ea1n s\u1ebd c\u1ee7ng c\u1ed1 kh\u1ea3 n\u0103ng x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, \u0111\u1ecbnh ngh\u0129a m\u1ed1i quan h\u1ec7 v\u00e0 tr\u00e1nh c\u00e1c l\u1ed7i c\u1ea5u tr\u00fac ph\u1ed5 bi\u1ebfn. M\u1ee5c ti\u00eau l\u00e0 ph\u00e1t tri\u1ec3n m\u1ed9t quy tr\u00ecnh l\u00e0m vi\u1ec7c \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i c\u00e1c y\u00eau c\u1ea7u ph\u1ee9c t\u1ea1p th\u00e0nh c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u s\u1ea1ch s\u1ebd v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n

\n
\"Child's<\/figure>\n<\/div>\n

Hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i \ud83e\uddf1<\/h2>\n

Tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o c\u00e1c t\u00ecnh hu\u1ed1ng, \u0111i\u1ec1u c\u1ea7n thi\u1ebft l\u00e0 xem l\u1ea1i c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u1ee7a ERD. M\u1ed9t n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc \u0111\u1ea3m b\u1ea3o r\u1eb1ng khi b\u1ea1n \u0111\u1ed1i m\u1eb7t v\u1edbi c\u00e1c y\u00eau c\u1ea7u ph\u1ee9c t\u1ea1p, b\u1ea1n kh\u00f4ng ph\u1ea3i h\u1ecdc l\u1ea1i nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n.<\/p>\n

1. Th\u1ef1c th\u1ec3 v\u00e0 thu\u1ed9c t\u00ednh<\/h3>\n
    \n
  • Th\u1ef1c th\u1ec3:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m ri\u00eang bi\u1ec7t trong h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n. V\u00ed d\u1ee5 bao g\u1ed3mKh\u00e1ch h\u00e0ng<\/em>, S\u1ea3n ph\u1ea9m<\/em>, ho\u1eb7cNh\u00e2n vi\u00ean<\/em>.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> Ch\u00fang m\u00f4 t\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3. \u0110\u1ed1i v\u1edbi m\u1ed9tKh\u00e1ch h\u00e0ng<\/em>, c\u00e1c thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 l\u00e0M\u00e3Kh\u00e1chH\u00e0ng<\/em>, T\u00ean<\/em>, v\u00e0\u0110\u1ecbaCh\u1ec9Email<\/em>.<\/li>\n
  • Kh\u00f3a ch\u00ednh:<\/strong> M\u1ed7i th\u1ef1c th\u1ec3 \u0111\u1ec1u c\u1ea7n m\u1ed9t \u0111\u1ecbnh danh duy nh\u1ea5t \u0111\u1ec3 ph\u00e2n bi\u1ec7t m\u1ed9t b\u1ea3n ghi v\u1edbi b\u1ea3n ghi kh\u00e1c.<\/li>\n<\/ul>\n

    2. M\u1ed1i quan h\u1ec7 v\u00e0 b\u1ed9i s\u1ed1<\/h3>\n

    M\u1ed1i li\u00ean k\u1ebft gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. B\u1ed9i s\u1ed1 x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean quan \u0111\u1ebfn th\u1ef1c th\u1ec3 kh\u00e1c.<\/p>\n\n\n\n\n\n\n\n
    Lo\u1ea1i b\u1ed9i s\u1ed1<\/th>\nM\u00f4 t\u1ea3<\/th>\nV\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
    M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1)<\/td>\nM\u1ed9t th\u1ec3 hi\u1ec7n li\u00ean quan \u0111\u1ebfn \u0111\u00fang m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/td>\nM\u1ed9t Nh\u00e2n vi\u00ean<\/em> c\u00f3 m\u1ed9t Th\u1ebb c\u0103n c\u01b0\u1edbc<\/em>.<\/td>\n<\/tr>\n
    M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N)<\/td>\nM\u1ed9t th\u1ec3 hi\u1ec7n li\u00ean quan \u0111\u1ebfn nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/td>\nM\u1ed9t Ph\u00f2ng ban<\/em> c\u00f3 nhi\u1ec1u Nh\u00e2n vi\u00ean<\/em>.<\/td>\n<\/tr>\n
    Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N)<\/td>\nNhi\u1ec1u th\u1ec3 hi\u1ec7n li\u00ean quan \u0111\u1ebfn nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/td>\nNhi\u1ec1u Sinh vi\u00ean<\/em> \u0111\u0103ng k\u00fd v\u00e0o nhi\u1ec1u Kh\u00f3a h\u1ecdc<\/em>.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    B\u1ed1i c\u1ea3nh 1: N\u1ec1n t\u1ea3ng Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed \ud83d\uded2<\/h2>\n

    C\u00e1c h\u1ec7 th\u1ed1ng b\u00e1n l\u1ebb tr\u1ef1c tuy\u1ebfn bao g\u1ed3m c\u00e1c giao d\u1ecbch ph\u1ee9c t\u1ea1p, qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho v\u00e0 t\u00e0i kho\u1ea3n ng\u01b0\u1eddi d\u00f9ng. B\u1ed1i c\u1ea3nh n\u00e0y ki\u1ec3m tra kh\u1ea3 n\u0103ng c\u1ee7a b\u1ea1n trong vi\u1ec7c x\u1eed l\u00fd c\u00e1c b\u1ea3ng li\u00ean k\u1ebft v\u00e0 theo d\u00f5i tr\u1ea1ng th\u00e1i.<\/p>\n

    Ph\u00e2n t\u00edch y\u00eau c\u1ea7u<\/h3>\n
      \n
    • M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng theo th\u1eddi gian.<\/li>\n
    • M\u1ed9t \u0111\u01a1n h\u00e0ng duy nh\u1ea5t c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u1ea3n ph\u1ea9m.<\/li>\n
    • M\u1ed9t s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u \u0111\u01a1n h\u00e0ng kh\u00e1c nhau.<\/li>\n
    • M\u1ed7i \u0111\u01a1n h\u00e0ng ph\u1ea3i theo d\u00f5i m\u1ed9t tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: \u0110ang ch\u1edd, \u0110\u00e3 g\u1eedi).<\/li>\n
    • S\u1ea3n ph\u1ea9m thu\u1ed9c v\u1ec1 c\u00e1c danh m\u1ee5c c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n

      C\u00e1c b\u01b0\u1edbc m\u00f4 h\u00ecnh h\u00f3a<\/h3>\n
        \n
      1. X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3:<\/strong> Kh\u00e1ch h\u00e0ng, \u0110\u01a1n h\u00e0ng, S\u1ea3n ph\u1ea9m, Danh m\u1ee5c.<\/li>\n
      2. X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh:<\/strong>\n
          \n
        • Kh\u00e1ch h\u00e0ng:<\/em> CustomerID, FirstName, LastName, Email.<\/li>\n
        • \u0110\u01a1n h\u00e0ng:<\/em> OrderID, OrderDate, Status, \u0110\u1ecba ch\u1ec9 giao h\u00e0ng.<\/li>\n
        • S\u1ea3n ph\u1ea9m:<\/em> ProductID, T\u00ean, Gi\u00e1, S\u1ed1 l\u01b0\u1ee3ng t\u1ed3n kho.<\/li>\n
        • Danh m\u1ee5c:<\/em> CategoryID, T\u00ean danh m\u1ee5c.<\/li>\n<\/ul>\n<\/li>\n
        • X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7:<\/strong>\n
            \n
          • Kh\u00e1ch h\u00e0ng \u0111\u1ebfn \u0110\u01a1n h\u00e0ng:<\/em> M\u1ed9t-\u0111a. M\u1ed9t kh\u00e1ch h\u00e0ng t\u1ea1o ra nhi\u1ec1u \u0111\u01a1n h\u00e0ng.<\/li>\n
          • \u0110\u01a1n h\u00e0ng \u0111\u1ebfn S\u1ea3n ph\u1ea9m:<\/em> \u0110a-\u0111a. M\u1ed9t \u0111\u01a1n h\u00e0ng ch\u1ee9a nhi\u1ec1u s\u1ea3n ph\u1ea9m, v\u00e0 m\u1ed9t s\u1ea3n ph\u1ea9m c\u00f3 m\u1eb7t trong nhi\u1ec1u \u0111\u01a1n h\u00e0ng. \u0110i\u1ec1u n\u00e0y y\u00eau c\u1ea7u m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft.<\/li>\n
          • S\u1ea3n ph\u1ea9m \u0111\u1ebfn Danh m\u1ee5c:<\/em> \u0110a-\u0111\u01a1n. Nhi\u1ec1u s\u1ea3n ph\u1ea9m thu\u1ed9c v\u1ec1 m\u1ed9t danh m\u1ee5c.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

            Tinh ch\u1ec9nh thi\u1ebft k\u1ebf<\/h3>\n

            \u0110\u1ed1i v\u1edbi m\u1ed1i quan h\u1ec7 \u0111a-\u0111a gi\u1eefa \u0110\u01a1n h\u00e0ng v\u00e0 S\u1ea3n ph\u1ea9m, b\u1ea1n ph\u1ea3i t\u1ea1o m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0OrderItems<\/em>. B\u1ea3ng n\u00e0y ph\u00e1 v\u1ee1 li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp v\u00e0 cho ph\u00e9p b\u1ea1n l\u01b0u tr\u1eef d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 v\u1ec1 d\u00f2ng giao d\u1ecbch, ch\u1eb3ng h\u1ea1n nh\u01b0S\u1ed1 l\u01b0\u1ee3ng<\/em> v\u00e0 Gi\u00e1 \u0111\u01a1n v\u1ecb t\u1ea1i th\u1eddi \u0111i\u1ec3m b\u00e1n<\/em>.<\/p>\n

              \n
            • Thu\u1ed9c t\u00ednh c\u1ee7a OrderItems:<\/strong> OrderItemID, OrderID (Kh\u00f3a ngo\u1ea1i), ProductID (Kh\u00f3a ngo\u1ea1i), S\u1ed1 l\u01b0\u1ee3ng, Gi\u00e1 \u0111\u01a1n v\u1ecb.<\/li>\n
            • Ki\u1ec3m tra chu\u1ea9n h\u00f3a:<\/strong> \u0110\u1ea3m b\u1ea3o Gi\u00e1 \u0111\u01a1n v\u1ecb<\/em> \u0111\u01b0\u1ee3c l\u01b0u \u1edf \u0111\u00e2y ch\u1ee9 kh\u00f4ng ph\u1ea3i trong b\u1ea3ng S\u1ea3n ph\u1ea9m<\/em> b\u1ea3ng, v\u00ec gi\u00e1 c\u1ea3 thay \u0111\u1ed5i theo th\u1eddi gian.<\/li>\n<\/ul>\n

              B\u1ed1i c\u1ea3nh 2: H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ec7nh vi\u1ec7n \ud83c\udfe5<\/h2>\n

              C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u y t\u1ebf \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c cao do t\u00ednh ch\u1ea5t quan tr\u1ecdng c\u1ee7a d\u1eef li\u1ec7u. B\u1ed1i c\u1ea3nh n\u00e0y nh\u1ea5n m\u1ea1nh t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u nghi\u00eam ng\u1eb7t v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ph\u00e2n c\u1ea5p.<\/p>\n

              Ph\u00e2n t\u00edch y\u00eau c\u1ea7u<\/h3>\n
                \n
              • C\u00e1c b\u00e1c s\u0129 chuy\u00ean v\u1ec1 c\u00e1c ph\u00f2ng ban c\u1ee5 th\u1ec3.<\/li>\n
              • B\u1ec7nh nh\u00e2n \u0111\u1ebfn g\u1eb7p b\u00e1c s\u0129 \u0111\u1ec3 kh\u00e1m b\u1ec7nh.<\/li>\n
              • M\u1ed9t b\u00e1c s\u0129 c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u b\u1ec7nh nh\u00e2n, v\u00e0 m\u1ed9t b\u1ec7nh nh\u00e2n c\u00f3 th\u1ec3 g\u1eb7p nhi\u1ec1u b\u00e1c s\u0129.<\/li>\n
              • Toa thu\u1ed1c \u0111\u01b0\u1ee3c c\u1ea5p trong c\u00e1c bu\u1ed5i kh\u00e1m b\u1ec7nh.<\/li>\n
              • M\u1ed7i b\u1ec7nh nh\u00e2n c\u00f3 m\u1ed9t h\u1ed3 s\u01a1 y t\u1ebf duy nh\u1ea5t.<\/li>\n<\/ul>\n

                C\u00e1c b\u01b0\u1edbc m\u00f4 h\u00ecnh h\u00f3a<\/h3>\n
                  \n
                1. X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3:<\/strong> B\u00e1c s\u0129, B\u1ec7nh nh\u00e2n, Cu\u1ed9c h\u1eb9n, Toa thu\u1ed1c, Ph\u00f2ng ban.<\/li>\n
                2. X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh:<\/strong>\n
                    \n
                  • B\u00e1c s\u0129:<\/em> M\u00e3 b\u00e1c s\u0129, T\u00ean, Chuy\u00ean khoa, S\u1ed1 gi\u1ea5y ph\u00e9p.<\/li>\n
                  • Ph\u00f2ng ban:<\/em> M\u00e3 ph\u00f2ng ban, T\u00ean ph\u00f2ng ban, M\u00e3 b\u00e1c s\u0129 tr\u01b0\u1edfng ph\u00f2ng.<\/li>\n
                  • Cu\u1ed9c h\u1eb9n:<\/em> M\u00e3 cu\u1ed9c h\u1eb9n, Ng\u00e0y gi\u1edd, Ghi ch\u00fa ch\u1ea9n \u0111o\u00e1n.<\/li>\n
                  • Toa thu\u1ed1c:<\/em> M\u00e3 toa thu\u1ed1c, T\u00ean thu\u1ed1c, Li\u1ec1u l\u01b0\u1ee3ng, Th\u1eddi gian d\u00f9ng.<\/li>\n<\/ul>\n<\/li>\n
                  • X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7:<\/strong>\n
                      \n
                    • Ph\u00f2ng ban \u0111\u1ebfn B\u00e1c s\u0129:<\/em> M\u1ed9t-\u0111a. M\u1ed9t ph\u00f2ng ban tuy\u1ec3n d\u1ee5ng nhi\u1ec1u b\u00e1c s\u0129.<\/li>\n
                    • B\u00e1c s\u0129 \u0111\u1ebfn Cu\u1ed9c h\u1eb9n:<\/em> M\u1ed9t-\u0111a. M\u1ed9t b\u00e1c s\u0129 th\u1ef1c hi\u1ec7n nhi\u1ec1u cu\u1ed9c h\u1eb9n.<\/li>\n
                    • B\u1ec7nh nh\u00e2n \u0111\u1ebfn kh\u00e1m:<\/em>M\u1ed9t-nhi\u1ec1u. M\u1ed9t b\u1ec7nh nh\u00e2n tham gia nhi\u1ec1u cu\u1ed9c h\u1eb9n kh\u00e1m.<\/li>\n
                    • Cu\u1ed9c h\u1eb9n kh\u00e1m \u0111\u1ebfn \u0111\u01a1n thu\u1ed1c:<\/em>M\u1ed9t-nhi\u1ec1u. M\u1ed9t cu\u1ed9c h\u1eb9n kh\u00e1m c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nhi\u1ec1u \u0111\u01a1n thu\u1ed1c.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                      X\u1eed l\u00fd c\u00e1c r\u00e0ng bu\u1ed9c ph\u1ee9c t\u1ea1p<\/h3>\n

                      Trong t\u00ecnh hu\u1ed1ng n\u00e0y, t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u. B\u1ea1n ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t \u0111\u01a1n thu\u1ed1c kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 cu\u1ed9c h\u1eb9n kh\u00e1m li\u00ean k\u1ebft. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c thi th\u00f4ng qua c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i.<\/p>\n

                        \n
                      • M\u1ed1i quan h\u1ec7 t\u1ef1 tham chi\u1ebfu:<\/strong> M\u1ed9t B\u00e1c s\u0129<\/em> th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 c\u1ea7n li\u00ean k\u1ebft v\u1edbi m\u1ed9t B\u00e1c s\u0129 tr\u01b0\u1edfng<\/em> trong c\u00f9ng m\u1ed9t b\u1ea3ng. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 M\u1ed9t-\u0111\u1ed1i-m\u1ed9t, n\u01a1i m\u00e0 HeadDoctorID<\/em> tham chi\u1ebfu \u0111\u1ebfn DoctorID<\/em>.<\/li>\n
                      • D\u1eef li\u1ec7u th\u1eddi gian:<\/strong> C\u00e1c cu\u1ed9c h\u1eb9n c\u00f3 ng\u00e0y c\u1ee5 th\u1ec3. \u0110\u1ea3m b\u1ea3o tr\u01b0\u1eddng DateTime \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef theo \u0111\u1ecbnh d\u1ea1ng chu\u1ea9n \u0111\u1ec3 cho ph\u00e9p truy v\u1ea5n l\u1eadp l\u1ecbch.<\/li>\n<\/ul>\n

                        C\u1ea3nh b\u00e1o 3: C\u1ed5ng th\u00f4ng tin sinh vi\u00ean tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc \ud83c\udf93<\/h2>\n

                        C\u00e1c h\u1ec7 th\u1ed1ng h\u1ecdc thu\u1eadt bao g\u1ed3m c\u00e1c m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u ph\u1ee9c t\u1ea1p v\u00e0 logic \u0111i\u1ec1u ki\u1ec7n. T\u00ecnh hu\u1ed1ng n\u00e0y t\u1eadp trung v\u00e0o vi\u1ec7c qu\u1ea3n l\u00fd \u0111\u0103ng k\u00fd h\u1ecdc v\u00e0 c\u00e1c \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft.<\/p>\n

                        Ph\u00e2n t\u00edch y\u00eau c\u1ea7u<\/h3>\n
                          \n
                        • Sinh vi\u00ean \u0111\u0103ng k\u00fd nhi\u1ec1u kh\u00f3a h\u1ecdc.<\/li>\n
                        • M\u1ed7i kh\u00f3a h\u1ecdc c\u00f3 nhi\u1ec1u gi\u1ea3ng vi\u00ean.<\/li>\n
                        • M\u1ed9t kh\u00f3a h\u1ecdc c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c cung c\u1ea5p trong nhi\u1ec1u h\u1ecdc k\u1ef3.<\/li>\n
                        • M\u1ed9t s\u1ed1 kh\u00f3a h\u1ecdc c\u00f3 \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft.<\/li>\n
                        • \u0110i\u1ec3m s\u1ed1 \u0111\u01b0\u1ee3c g\u00e1n cho t\u1eebng sinh vi\u00ean theo t\u1eebng kh\u00f3a h\u1ecdc.<\/li>\n<\/ul>\n

                          C\u00e1c b\u01b0\u1edbc m\u00f4 h\u00ecnh h\u00f3a<\/h3>\n
                            \n
                          1. X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3:<\/strong>Sinh vi\u00ean, Kh\u00f3a h\u1ecdc, Gi\u1ea3ng vi\u00ean, H\u1ecdc k\u1ef3, \u0110\u0103ng k\u00fd.<\/li>\n
                          2. X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh:<\/strong>\n
                              \n
                            • Sinh vi\u00ean:<\/em> MSSV, GPA, Chuy\u00ean ng\u00e0nh.<\/li>\n
                            • M\u00f4n h\u1ecdc:<\/em> M\u00e3 m\u00f4n h\u1ecdc, Ti\u00eau \u0111\u1ec1, S\u1ed1 t\u00edn ch\u1ec9.<\/li>\n
                            • Gi\u1ea3ng vi\u00ean:<\/em> MSSV gi\u1ea3ng vi\u00ean, H\u1ecd t\u00ean, Ch\u1ee9c danh.<\/li>\n
                            • \u0110\u0103ng k\u00fd:<\/em> MSSV \u0111\u0103ng k\u00fd, \u0110i\u1ec3m, H\u1ecdc k\u1ef3 n\u0103m.<\/li>\n<\/ul>\n<\/li>\n
                            • X\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7:<\/strong>\n
                                \n
                              • Sinh vi\u00ean \u0111\u1ebfn M\u00f4n h\u1ecdc:<\/em> Nhi\u1ec1u – Nhi\u1ec1u. \u0110\u01b0\u1ee3c qu\u1ea3n l\u00fd th\u00f4ng qua b\u1ea3ng \u0110\u0103ng k\u00fd<\/em>ph\u1ee5 tr\u1ee3.<\/li>\n
                              • M\u00f4n h\u1ecdc \u0111\u1ebfn Gi\u1ea3ng vi\u00ean:<\/em> Nhi\u1ec1u – Nhi\u1ec1u. M\u1ed9t m\u00f4n h\u1ecdc c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3ng d\u1ea1y b\u1edfi nhi\u1ec1u gi\u1ea3ng vi\u00ean theo th\u1eddi gian.<\/li>\n
                              • M\u00f4n h\u1ecdc \u0111\u1ebfn \u0110i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft:<\/em>T\u1ef1 tham chi\u1ebfu. M\u1ed9t m\u00f4n h\u1ecdc li\u1ec7t k\u00ea m\u1ed9t m\u00f4n h\u1ecdc kh\u00e1c l\u00e0 \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                                X\u1eed l\u00fd logic \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft<\/h3>\n

                                Y\u00eau c\u1ea7u \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft t\u1ea1o ra m\u1ed9t m\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy trong th\u1ef1c th\u1ec3 M\u00f4n h\u1ecdc<\/em> . B\u1ea1n c\u1ea7n m\u1ed9t c\u1ed9t trong b\u1ea3ng M\u00f4n h\u1ecdc<\/em> , v\u00ed d\u1ee5 nh\u01b0 M\u00e3 m\u00f4n h\u1ecdc \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft<\/em>, tham chi\u1ebfu \u0111\u1ebfn M\u00e3 m\u00f4n h\u1ecdc<\/em> c\u1ee7a m\u1ed9t h\u00e0ng kh\u00e1c trong c\u00f9ng b\u1ea3ng.<\/p>\n

                                  \n
                                • Th\u1ef1c hi\u1ec7n:<\/strong> \u0110i\u1ec1u n\u00e0y cho ph\u00e9p m\u1ed9t To\u00e1n 101<\/em> kh\u00f3a h\u1ecdc \u0111\u1ec3 li\u00ean k\u1ebft v\u1edbi m\u1ed9t To\u00e1n 100<\/em> kh\u00f3a h\u1ecdc.<\/li>\n
                                • X\u00e1c th\u1ef1c:<\/strong> H\u1ec7 th\u1ed1ng ph\u1ea3i ng\u0103n ch\u1eb7n vi\u1ec7c m\u1ed9t kh\u00f3a h\u1ecdc tr\u1edf th\u00e0nh \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft c\u1ee7a ch\u00ednh n\u00f3 \u0111\u1ec3 tr\u00e1nh c\u00e1c l\u1ed7i logic v\u00f2ng tr\u00f2n.<\/li>\n<\/ul>\n

                                  Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 ERD \u26a0\ufe0f<\/h2>\n

                                  Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. Vi\u1ec7c xem x\u00e9t c\u00e1c l\u1ed7i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap b\u1ea1n tinh ch\u1ec9nh m\u00f4 h\u00ecnh c\u1ee7a m\u00ecnh tr\u01b0\u1edbc khi tri\u1ec3n khai.<\/p>\n

                                  1. D\u1eef li\u1ec7u tr\u00f9ng l\u1eb7p<\/h3>\n

                                  L\u01b0u tr\u1eef c\u00f9ng m\u1ed9t th\u00f4ng tin \u1edf nhi\u1ec1u n\u01a1i l\u00e0m t\u0103ng nguy c\u01a1 kh\u00f4ng nh\u1ea5t qu\u00e1n. V\u00ed d\u1ee5, l\u01b0u \u0111\u1ecba ch\u1ec9 kh\u00e1ch h\u00e0ng trong b\u1ea3ng \u0110\u01a1n h\u00e0ng<\/em> l\u00e0 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c cho m\u1ee5c \u0111\u00edch giao h\u00e0ng, nh\u01b0ng b\u1ea3ng Kh\u00e1ch h\u00e0ng<\/em> n\u00ean v\u1eabn l\u00e0 ngu\u1ed3n th\u00f4ng tin ch\u00ednh x\u00e1c cho \u0111\u1ecba ch\u1ec9 th\u01b0\u1eddng tr\u00fa c\u1ee7a h\u1ecd.<\/p>\n

                                    \n
                                  • Ki\u1ec3m tra:<\/strong> H\u1ecfi xem vi\u1ec7c thay \u0111\u1ed5i m\u1ed9t thu\u1ed9c t\u00ednh trong m\u1ed9t b\u1ea3ng c\u00f3 y\u00eau c\u1ea7u c\u1eadp nh\u1eadt \u1edf c\u00e1c b\u1ea3ng kh\u00e1c hay kh\u00f4ng.<\/li>\n
                                  • S\u1eeda:<\/strong> Chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u theo d\u1ea1ng chu\u1ea9n h\u00f3a th\u1ee9 ba (3NF) n\u1ebfu c\u00f3 th\u1ec3.<\/li>\n<\/ul>\n

                                    2. M\u1ed1i quan h\u1ec7 m\u01a1 h\u1ed3<\/h3>\n

                                    \u0110\u00f4i khi kh\u00f4ng r\u00f5 m\u1ed1i quan h\u1ec7 l\u00e0 b\u1eaft bu\u1ed9c hay t\u00f9y ch\u1ecdn. Trong m\u1ed1i quan h\u1ec7 gi\u1eefa Kh\u00e1ch h\u00e0ng<\/em> v\u00e0 \u0110\u01a1n h\u00e0ng<\/em> m\u1ed1i quan h\u1ec7, kh\u00e1ch h\u00e0ng t\u1ed3n t\u1ea1i tr\u01b0\u1edbc khi \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. Tuy nhi\u00ean, m\u1ed9t \u0111\u01a1n h\u00e0ng lu\u00f4n ph\u1ea3i thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng.<\/p>\n\n\n\n\n\n\n
                                    Kh\u00e1i ni\u1ec7m<\/th>\n\u00dd ngh\u0129a<\/th>\n<\/tr>\n<\/thead>\n
                                    M\u1ed1i quan h\u1ec7 t\u00f9y ch\u1ecdn<\/td>\nC\u01a1 th\u1ec3 \u1edf ph\u00eda n\u00e0y kh\u00f4ng y\u00eau c\u1ea7u li\u00ean k\u1ebft v\u1edbi c\u01a1 th\u1ec3 kia.<\/td>\n<\/tr>\n
                                    M\u1ed1i quan h\u1ec7 b\u1eaft bu\u1ed9c<\/td>\nC\u01a1 th\u1ec3 \u1edf ph\u00eda n\u00e0y ph\u1ea3i c\u00f3 li\u00ean k\u1ebft v\u1edbi c\u01a1 th\u1ec3 kia.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                    3. B\u1ecf qua ki\u1ec3u d\u1eef li\u1ec7u<\/h3>\n

                                    Vi\u1ec7c ch\u1ecdn ki\u1ec3u d\u1eef li\u1ec7u sai c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u00e3ng ph\u00ed b\u1ed9 nh\u1edb ho\u1eb7c sai s\u00f3t trong t\u00ednh to\u00e1n. V\u00ed d\u1ee5, s\u1eed d\u1ee5ng ki\u1ec3u Integer cho tr\u01b0\u1eddng Price m\u00e0 kh\u00f4ng c\u00f3 ph\u1ea7n th\u1eadp ph\u00e2n s\u1ebd d\u1eabn \u0111\u1ebfn m\u1ea5t \u0111\u1ed9 ch\u00ednh x\u00e1c ti\u1ec1n t\u1ec7.<\/p>\n

                                      \n
                                    • Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t:<\/strong>S\u1eed d\u1ee5ng ki\u1ec3u Decimal cho ti\u1ec1n t\u1ec7 v\u00e0 ki\u1ec3u Date\/Time cho l\u1eadp l\u1ecbch.<\/li>\n
                                    • R\u00e0ng bu\u1ed9c:<\/strong>X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 d\u00e0i t\u1ed1i \u0111a cho c\u00e1c tr\u01b0\u1eddng v\u0103n b\u1ea3n \u0111\u1ec3 ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng bloat c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

                                      Quy tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a t\u1eebng b\u01b0\u1edbc \ud83d\udcdd<\/h2>\n

                                      Th\u1ef1c hi\u1ec7n theo c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n trong t\u1ea5t c\u1ea3 c\u00e1c b\u00e0i t\u1eadp c\u1ee7a b\u1ea1n.<\/p>\n

                                        \n
                                      1. Thu th\u1eadp y\u00eau c\u1ea7u:<\/strong>Li\u1ec7t k\u00ea m\u1ecdi danh t\u1eeb (\u0110\u1ed1i t\u01b0\u1ee3ng) v\u00e0 \u0111\u1ed9ng t\u1eeb (M\u1ed1i quan h\u1ec7) \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong m\u00f4 t\u1ea3 v\u1ea5n \u0111\u1ec1.<\/li>\n
                                      2. V\u1ebd s\u01a1 \u0111\u1ed3 ban \u0111\u1ea7u:<\/strong>\u0110\u1eb7t c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 v\u1ebd c\u00e1c \u0111\u01b0\u1eddng \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c k\u1ebft n\u1ed1i. Ch\u01b0a c\u1ea7n lo v\u1ec1 s\u1ef1 ho\u00e0n h\u1ea3o ngay l\u00fac n\u00e0y.<\/li>\n
                                      3. G\u00e1n kh\u00f3a:<\/strong>X\u00e1c \u0111\u1ecbnh Kh\u00f3a ch\u00ednh cho m\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 Kh\u00f3a ngo\u1ea1i cho m\u1ed7i m\u1ed1i quan h\u1ec7.<\/li>\n
                                      4. Tinh ch\u1ec9nh t\u00ednh ch\u1ea5t cardinality:<\/strong>X\u00e1c minh c\u00e1c m\u1ed1i quan h\u1ec7 1:1, 1:N v\u00e0 M:N d\u1ef1a tr\u00ean c\u00e1c quy t\u1eafc kinh doanh.<\/li>\n
                                      5. Th\u00eam thu\u1ed9c t\u00ednh:<\/strong>L\u00e0m \u0111\u1ea7y \u0111\u1ee7 t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eb1ng c\u00e1c tr\u01b0\u1eddng c\u1ea7n thi\u1ebft. Lo\u1ea1i b\u1ecf b\u1ea5t k\u1ef3 tr\u01b0\u1eddng n\u00e0o \u0111\u01b0\u1ee3c suy ra t\u1eeb c\u00e1c tr\u01b0\u1eddng kh\u00e1c.<\/li>\n
                                      6. Xem x\u00e9t \u0111\u1ec3 chu\u1ea9n h\u00f3a:<\/strong>\u0110\u1ea3m b\u1ea3o kh\u00f4ng t\u1ed3n t\u1ea1i c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u (v\u00ed d\u1ee5: n\u1ebfuA<\/em>x\u00e1c \u0111\u1ecbnhB<\/em>, v\u00e0B<\/em>x\u00e1c \u0111\u1ecbnhC<\/em>, th\u00ecA<\/em>kh\u00f4ng n\u00ean x\u00e1c \u0111\u1ecbnhC<\/em> tr\u1ef1c ti\u1ebfp).<\/li>\n
                                      7. X\u00e1c nh\u1eadn cu\u1ed1i c\u00f9ng:<\/strong>\u0110i qua m\u1ed9t t\u00ecnh hu\u1ed1ng nh\u1eadp d\u1eef li\u1ec7u \u0111\u1ec3 xem m\u00f4 h\u00ecnh c\u00f3 h\u1ed7 tr\u1ee3 n\u00f3 hay kh\u00f4ng.<\/li>\n<\/ol>\n

                                        B\u1ea3ng ki\u1ec3m t\u1ef1 \u0111\u00e1nh gi\u00e1 \u2705<\/h2>\n

                                        Tr\u01b0\u1edbc khi ho\u00e0n t\u1ea5t s\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n, h\u00e3y \u0111i qua danh s\u00e1ch ki\u1ec3m tra n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n

                                          \n
                                        • T\u00ednh duy nh\u1ea5t:<\/strong>M\u1ed7i b\u1ea3ng c\u00f3 kh\u00f3a ch\u00ednh kh\u00f4ng?<\/li>\n
                                        • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u c\u00f3 nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c b\u1ea3ng li\u00ean quan kh\u00f4ng?<\/li>\n
                                        • T\u00ednh \u0111\u1ea7y \u0111\u1ee7:<\/strong>B\u1ea1n c\u00f3 th\u1ec3 ch\u00e8n t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u y\u00eau c\u1ea7u m\u00e0 kh\u00f4ng vi ph\u1ea1m c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f4ng?<\/li>\n
                                        • T\u00ednh r\u00f5 r\u00e0ng:<\/strong>T\u00ean th\u1ef1c th\u1ec3 v\u00e0 thu\u1ed9c t\u00ednh c\u00f3 m\u00f4 t\u1ea3 r\u00f5 r\u00e0ng v\u00e0 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a kh\u00f4ng?<\/li>\n
                                        • T\u00ednh m\u1edf r\u1ed9ng:<\/strong>Thi\u1ebft k\u1ebf c\u00f3 ch\u1ecbu \u0111\u01b0\u1ee3c n\u1ebfu kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng g\u1ea5p m\u01b0\u1eddi l\u1ea7n kh\u00f4ng?<\/li>\n
                                        • R\u00e0ng bu\u1ed9c:<\/strong>C\u00e1c r\u00e0ng bu\u1ed9c null c\u00f3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u00fang n\u01a1i d\u1eef li\u1ec7u l\u00e0 b\u1eaft bu\u1ed9c kh\u00f4ng?<\/li>\n<\/ul>\n

                                          C\u00e1c c\u00e2n nh\u1eafc n\u00e2ng cao \ud83d\ude80<\/h2>\n

                                          Khi b\u1ea1n t\u1ef1 tin h\u01a1n, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e2ng cao h\u01a1n.<\/p>\n

                                          1. Th\u1ef1c th\u1ec3 y\u1ebfu<\/h3>\n

                                          M\u1ed9t th\u1ef1c th\u1ec3 y\u1ebfu ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t th\u1ef1c th\u1ec3 kh\u00e1c \u0111\u1ec3 t\u1ed3n t\u1ea1i. V\u00ed d\u1ee5, m\u1ed9t OrderLine<\/em> kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 m\u1ed9t Order<\/em>. Kh\u00f3a ch\u00ednh c\u1ee7a n\u00f3 th\u01b0\u1eddng l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa kh\u00f3a ph\u1ea7n c\u1ee7a ch\u00ednh n\u00f3 v\u00e0 kh\u00f3a ch\u00ednh c\u1ee7a ch\u1ee7 s\u1edf h\u1eefu.<\/p>\n

                                          2. K\u1ebf th\u1eeba<\/h3>\n

                                          \u0110\u00f4i khi c\u00e1c th\u1ef1c th\u1ec3 chia s\u1ebb c\u00e1c thu\u1ed9c t\u00ednh chung. Trong m\u1ed9t h\u1ec7 th\u1ed1ng Employee<\/em> h\u1ec7 th\u1ed1ng, FullTime<\/em> v\u00e0 B\u00e1n th\u1eddi gian<\/em> c\u00e1c nh\u00e2n vi\u00ean chia s\u1ebb m\u1ed9t ID v\u00e0 t\u00ean nh\u01b0ng kh\u00e1c nhau v\u1ec1 quy\u1ec1n l\u1ee3i. B\u1ea1n c\u00f3 th\u1ec3 m\u00f4 h\u00ecnh h\u00f3a \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u1ea5u tr\u00fac si\u00eau l\u1edbp v\u00e0 l\u1edbp con.<\/p>\n

                                          3. B\u1ea3ng th\u1eddi gian<\/h3>\n

                                          M\u1ed9t s\u1ed1 d\u1eef li\u1ec7u thay \u0111\u1ed5i theo th\u1eddi gian. M\u1ed9t Gi\u00e1 s\u1ea3n ph\u1ea9m<\/em> thay \u0111\u1ed5i h\u00e0ng tu\u1ea7n. B\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n l\u01b0u tr\u1eef l\u1ecbch s\u1eed thay \u0111\u1ed5i gi\u00e1 thay v\u00ec ch\u1ec9 gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi ph\u1ea3i th\u00eam ng\u00e0y b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac hi\u1ec7u l\u1ef1c v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a b\u1ea1n.<\/p>\n

                                          Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho th\u1ef1c h\u00e0nh \ud83d\udca1<\/h2>\n

                                          X\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin trong thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 ERD l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh d\u1ea7n d\u1ea7n. N\u00f3 bao g\u1ed3m vi\u1ec7c tinh ch\u1ec9nh li\u00ean t\u1ee5c v\u00e0 suy ngh\u0129 ph\u1ea3n bi\u1ec7n v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n qua m\u1ed9t h\u1ec7 th\u1ed1ng. B\u1eb1ng c\u00e1ch l\u00e0m vi\u1ec7c qua c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf nh\u01b0 Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, Y t\u1ebf v\u00e0 Gi\u00e1o d\u1ee5c, b\u1ea1n s\u1ebd ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec1u th\u00e1ch th\u1ee9c c\u1ea5u tr\u00fac kh\u00e1c nhau.<\/p>\n

                                          H\u00e3y nh\u1edb r\u1eb1ng hi\u1ebfm khi c\u00f3 m\u1ed9t m\u00f4 h\u00ecnh ‘ho\u00e0n h\u1ea3o’ duy nh\u1ea5t. C\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau c\u00f3 th\u1ec3 \u01b0u ti\u00ean c\u00e1c kh\u00eda c\u1ea1nh kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc so v\u1edbi t\u1ed1c \u0111\u1ed9 ghi. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 hi\u1ec3u r\u00f5 c\u00e1c th\u1ecfa hi\u1ec7p li\u00ean quan \u0111\u1ebfn l\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n.<\/p>\n

                                          Ti\u1ebfp t\u1ee5c luy\u1ec7n t\u1eadp v\u1edbi c\u00e1c y\u00eau c\u1ea7u m\u1edbi. H\u00e3y th\u1eed m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n, h\u1ec7 th\u1ed1ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n ho\u1eb7c m\u1ea1ng x\u00e3 h\u1ed9i. M\u1ed7i l\u0129nh v\u1ef1c \u0111\u1ec1u mang l\u1ea1i nh\u1eefng r\u00e0ng bu\u1ed9c v\u00e0 m\u1eabu quan h\u1ec7 ri\u00eang bi\u1ec7t. C\u00e0ng luy\u1ec7n t\u1eadp nhi\u1ec1u, qu\u00e1 tr\u00ecnh n\u00e0y s\u1ebd tr\u1edf n\u00ean t\u1ef1 nhi\u00ean h\u01a1n.<\/p>\n

                                          Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h3>\n
                                            \n
                                          • C\u00e1c th\u1ef1c th\u1ec3 l\u00e0 n\u1ec1n t\u1ea3ng:<\/strong> X\u00e1c \u0111\u1ecbnh ch\u00fang m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng tr\u01b0\u1edbc khi k\u1ebft n\u1ed1i ch\u00fang.<\/li>\n
                                          • S\u1ed1 l\u01b0\u1ee3ng quan h\u1ec7 l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7 ph\u00f9 h\u1ee3p v\u1edbi quy t\u1eafc kinh doanh.<\/li>\n
                                          • Chu\u1ea9n h\u00f3a gi\u1ea3m thi\u1ec3u r\u1ee7i ro:<\/strong> Tr\u00e1nh tr\u00f9ng l\u1eb7p \u0111\u1ec3 duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/li>\n
                                          • Xem x\u00e9t th\u01b0\u1eddng xuy\u00ean:<\/strong> Lu\u00f4n ki\u1ec3m tra thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n tr\u01b0\u1edbc c\u00e1c y\u00eau c\u1ea7u m\u1edbi.<\/li>\n<\/ul>\n

                                            V\u1edbi s\u1ef1 t\u1eadn t\u00e2m v\u00e0 luy\u1ec7n t\u1eadp c\u00f3 c\u1ea5u tr\u00fac, b\u1ea1n s\u1ebd ph\u00e1t tri\u1ec3n \u0111\u01b0\u1ee3c c\u00e1c k\u1ef9 n\u0103ng c\u1ea7n thi\u1ebft \u0111\u1ec3 thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady, c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. H\u00e3y t\u1eadp trung v\u00e0o logic \u0111\u1eb1ng sau c\u00e1c m\u1ed1i li\u00ean k\u1ebft, v\u00e0 vi\u1ec7c tri\u1ec3n khai k\u1ef9 thu\u1eadt s\u1ebd t\u1ef1 nhi\u00ean theo sau.<\/p>\n","protected":false},"excerpt":{"rendered":"

                                            Thi\u1ebft k\u1ebf m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd \u0111\u00f2i h\u1ecfi h\u01a1n c\u1ea3 vi\u1ec7c hi\u1ec3u ng\u1eef ph\u00e1p. N\u00f3 \u0111\u00f2i h\u1ecfi m\u1ed9t m\u00f4 h\u00ecnh t\u01b0 duy r\u00f5 r\u00e0ng v\u1ec1 c\u00e1ch d\u1eef…<\/p>\n","protected":false},"author":1,"featured_media":1585,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"B\u00e0i t\u1eadp th\u1ef1c h\u00e0nh s\u01a1 \u0111\u1ed3 ERD: X\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf \ud83c\udfaf","_yoast_wpseo_metadesc":"C\u1ee7ng c\u1ed1 k\u1ef9 n\u0103ng m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n v\u1edbi c\u00e1c b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh s\u01a1 \u0111\u1ed3 ERD. Kh\u00e1m ph\u00e1 c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf, nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1eebng b\u01b0\u1edbc.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[86],"tags":[82,85],"class_list":["post-1584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nB\u00e0i t\u1eadp th\u1ef1c h\u00e0nh s\u01a1 \u0111\u1ed3 ERD: X\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf \ud83c\udfaf<\/title>\n<meta name=\"description\" content=\"C\u1ee7ng c\u1ed1 k\u1ef9 n\u0103ng m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n v\u1edbi c\u00e1c b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh s\u01a1 \u0111\u1ed3 ERD. 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