{"id":1782,"date":"2026-03-24T11:47:14","date_gmt":"2026-03-24T11:47:14","guid":{"rendered":"https:\/\/www.go-diagram.com\/vi\/future-proof-database-scalable-erd-design-principles\/"},"modified":"2026-03-24T11:47:14","modified_gmt":"2026-03-24T11:47:14","slug":"future-proof-database-scalable-erd-design-principles","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/vi\/future-proof-database-scalable-erd-design-principles\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn ERD: B\u1ea3o v\u1ec7 C\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u01b0\u1edbc t\u01b0\u01a1ng lai: C\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng"},"content":{"rendered":"

Vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u gi\u1ed1ng nh\u01b0 vi\u1ec7c x\u00e2y d\u1ef1ng n\u1ec1n m\u00f3ng cho m\u1ed9t t\u00f2a nh\u00e0 ch\u1ecdc tr\u1eddi. N\u1ebfu b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf c\u00f3 l\u1ed7i, c\u1ea5u tr\u00fac s\u1ebd d\u1ea7n n\u1ee9t v\u1ee1 d\u01b0\u1edbi \u00e1p l\u1ef1c. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) ch\u00ednh l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf \u0111\u00f3. N\u00f3 x\u00e1c \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u k\u1ebft n\u1ed1i, lu\u1ed3ng d\u1eef li\u1ec7u v\u00e0 duy tr\u00ec trong \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. Khi s\u1ed1 l\u01b0\u1ee3ng ng\u01b0\u1eddi d\u00f9ng t\u0103ng l\u00ean v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u b\u00f9ng n\u1ed5, m\u1ed9t thi\u1ebft k\u1ebf t\u0129nh th\u01b0\u1eddng tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ec1n v\u1eefng, b\u1ea1n ph\u1ea3i \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng ngay t\u1eeb \u0111\u1ea7u. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c k\u1ef9 thu\u1eadt c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i l\u00e2u d\u00e0i.<\/p>\n

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\"Infographic<\/figure>\n<\/div>\n

Hi\u1ec3u r\u00f5 c\u1ed1t l\u00f5i c\u1ee7a m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u \ud83e\uddf1<\/h2>\n

Tr\u01b0\u1edbc khi \u0111i s\u00e2u v\u00e0o c\u00e1c chi\u1ebfn thu\u1eadt c\u1ee5 th\u1ec3, \u0111i\u1ec1u thi\u1ebft y\u1ebfu l\u00e0 ph\u1ea3i hi\u1ec3u ERD \u0111\u1ea1i di\u1ec7n cho \u0111i\u1ec1u g\u00ec. N\u00f3 tr\u1ef1c quan h\u00f3a c\u1ea5u tr\u00fac logic c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u. N\u00f3 bi\u1ec3u di\u1ec5n c\u00e1c th\u1ef1c th\u1ec3 (b\u1ea3ng), thu\u1ed9c t\u00ednh (c\u1ed9t) v\u00e0 m\u1ed1i quan h\u1ec7 (kh\u00f3a). M\u1ed9t m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t s\u1ebd c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 hi\u1ec7u su\u1ea5t. Tuy nhi\u00ean, ‘th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t’ thay \u0111\u1ed5i t\u00f9y theo kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c. \u1ee8ng d\u1ee5ng n\u1eb7ng v\u1ec1 \u0111\u1ecdc y\u00eau c\u1ea7u t\u1ed1i \u01b0u h\u00f3a kh\u00e1c v\u1edbi h\u1ec7 th\u1ed1ng giao d\u1ecbch n\u1eb7ng v\u1ec1 ghi.<\/p>\n

C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh bao g\u1ed3m:<\/p>\n

    \n
  • Th\u1ef1c th\u1ec3:<\/strong> Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh, ch\u1eb3ng h\u1ea1n nh\u01b0 Ng\u01b0\u1eddi d\u00f9ng, \u0110\u01a1n h\u00e0ng ho\u1eb7c S\u1ea3n ph\u1ea9m.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> C\u00e1c thu\u1ed9c t\u00ednh x\u00e1c \u0111\u1ecbnh m\u1ed9t th\u1ef1c th\u1ec3, nh\u01b0 \u0111\u1ecba ch\u1ec9 email ho\u1eb7c gi\u00e1 c\u1ea3.<\/li>\n
  • M\u1ed1i quan h\u1ec7:<\/strong> C\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau, th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi kh\u00f3a ngo\u1ea1i.<\/li>\n
  • S\u1ed1 l\u01b0\u1ee3ng (Cardinality):<\/strong> M\u1ed1i quan h\u1ec7 s\u1ed1 l\u01b0\u1ee3ng gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 (m\u1ed9t-m\u1ed9t, m\u1ed9t-nhi\u1ec1u, nhi\u1ec1u-nhi\u1ec1u).<\/li>\n<\/ul>\n

    Chu\u1ea9n h\u00f3a: S\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 t\u1ed1c \u0111\u1ed9 \u2696\ufe0f<\/h2>\n

    Chu\u1ea9n h\u00f3a l\u00e0 qu\u00e1 tr\u00ecnh t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u nh\u1eb1m gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n. M\u1eb7c d\u00f9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t quy t\u1eafc nghi\u00eam ng\u1eb7t, nh\u01b0ng \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i. Chu\u1ea9n h\u00f3a cao l\u00e0m gi\u1ea3m thi\u1ec3u c\u00e1c b\u1ea5t th\u01b0\u1eddng nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p truy v\u1ea5n th\u00f4ng qua c\u00e1c ph\u00e9p n\u1ed1i. Chu\u1ea9n h\u00f3a th\u1ea5p (phi chu\u1ea9n h\u00f3a) l\u00e0m t\u0103ng t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc nh\u01b0ng ti\u1ec1m \u1ea9n nguy c\u01a1 b\u1ea5t nh\u1ea5t d\u1eef li\u1ec7u.<\/p>\n

    C\u00e1c m\u1ee9c \u0111\u1ed9 chu\u1ea9n h\u00f3a<\/h3>\n

    Hi\u1ec3u r\u00f5 c\u00e1c d\u1ea1ng chu\u1ea9n gi\u00fap b\u1ea1n quy\u1ebft \u0111\u1ecbnh d\u1eebng \u1edf \u0111\u00e2u. M\u1ed7i d\u1ea1ng gi\u1ea3i quy\u1ebft c\u00e1c b\u1ea5t th\u01b0\u1eddng d\u1eef li\u1ec7u c\u1ee5 th\u1ec3.<\/p>\n

      \n
    • D\u1ea1ng chu\u1ea9n th\u1ee9 nh\u1ea5t (1NF):<\/strong> \u0110\u1ea3m b\u1ea3o t\u00ednh nguy\u00ean t\u1eed. M\u1ed7i c\u1ed9t ph\u1ea3i ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb kh\u00f4ng th\u1ec3 chia nh\u1ecf. Kh\u00f4ng c\u00f3 nh\u00f3m l\u1eb7p l\u1ea1i hay m\u1ea3ng trong m\u1ed9t \u00f4 duy nh\u1ea5t.<\/li>\n
    • D\u1ea1ng chu\u1ea9n th\u1ee9 hai (2NF):<\/strong> D\u1ef1a tr\u00ean 1NF. T\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o to\u00e0n b\u1ed9 kh\u00f3a ch\u00ednh, ch\u1ee9 kh\u00f4ng ch\u1ec9 m\u1ed9t ph\u1ea7n c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c ri\u00eang ph\u1ea7n.<\/li>\n
    • D\u1ea1ng chu\u1ea9n th\u1ee9 ba (3NF):<\/strong> D\u1ef1a tr\u00ean 2NF. C\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00f4ng \u0111\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00e1c. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u.<\/li>\n
    • D\u1ea1ng chu\u1ea9n Boyce-Codd (BCNF):<\/strong> M\u1ed9t phi\u00ean b\u1ea3n nghi\u00eam ng\u1eb7t h\u01a1n c\u1ee7a 3NF. N\u00f3 x\u1eed l\u00fd c\u00e1c tr\u01b0\u1eddng h\u1ee3p m\u00e0 c\u00e1c y\u1ebfu t\u1ed1 x\u00e1c \u0111\u1ecbnh kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f3a \u1ee9ng vi\u00ean.<\/li>\n<\/ul>\n

      \u0110\u1ed1i v\u1edbi ph\u1ea7n l\u1edbn h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, \u0111\u1ea1t \u0111\u1ebfn 3NF l\u00e0 m\u1ee5c ti\u00eau ti\u00eau chu\u1ea9n. \u0110i xa h\u01a1n th\u01b0\u1eddng mang l\u1ea1i l\u1ee3i \u00edch gi\u1ea3m d\u1ea7n trong khi l\u00e0m t\u0103ng chi ph\u00ed b\u1ea3o tr\u00ec. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng tr\u1ecdng t\u00e2m ph\u00e2n t\u00edch, vi\u1ec7c quay tr\u1edf l\u1ea1i phi chu\u1ea9n h\u00f3a m\u1ed9t c\u00e1ch ki\u1ec3m so\u00e1t l\u00e0 ph\u1ed5 bi\u1ebfn.<\/p>\n

      B\u1ea3ng \u0111\u00e1nh \u0111\u1ed5i gi\u1eefa chu\u1ea9n h\u00f3a<\/h3>\n\n\n\n\n\n\n\n\n
      M\u1ee9c \u0111\u1ed9 chu\u1ea9n h\u00f3a<\/th>\nL\u1ee3i \u00edch ch\u00ednh<\/th>\nNh\u01b0\u1ee3c \u0111i\u1ec3m ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n
      1NF<\/td>\nL\u01b0u tr\u1eef d\u1eef li\u1ec7u nguy\u00ean t\u1eed<\/td>\nKh\u00f4ng<\/td>\n<\/tr>\n
      2NF<\/td>\nLo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c ri\u00eang ph\u1ea7n<\/td>\nY\u00eau c\u1ea7u nhi\u1ec1u thao t\u00e1c n\u1ed1i h\u01a1n<\/td>\n<\/tr>\n
      3NF<\/td>\nLo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u<\/td>\n\u0110\u1ed9 ph\u1ee9c t\u1ea1p thao t\u00e1c n\u1ed1i t\u0103ng l\u00ean<\/td>\n<\/tr>\n
      Kh\u00f4ng chu\u1ea9n h\u00f3a<\/td>\nTruy v\u1ea5n \u0111\u1ecdc nhanh h\u01a1n<\/td>\nD\u01b0 th\u1eeba d\u1eef li\u1ec7u v\u00e0 l\u1ed7i c\u1eadp nh\u1eadt<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 cho s\u1ef1 ph\u00e1t tri\u1ec3n v\u00e0 linh ho\u1ea1t \ud83d\udcc8<\/h2>\n

      Thi\u1ebft k\u1ebf cho hi\u1ec7n t\u1ea1i l\u00e0 ch\u01b0a \u0111\u1ee7. B\u1ea1n ph\u1ea3i d\u1ef1 \u0111o\u00e1n s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3 trong t\u01b0\u01a1ng lai. C\u00e1c c\u1ea5u tr\u00fac c\u1ee9ng nh\u1eafc s\u1ebd b\u1ecb h\u1ecfng khi logic kinh doanh thay \u0111\u1ed5i. Thi\u1ebft k\u1ebf linh ho\u1ea1t cho ph\u00e9p m\u1edf r\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i di d\u1eddi to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/p>\n

      1. Quy \u01b0\u1edbc v\u00e0 ti\u00eau chu\u1ea9n \u0111\u1eb7t t\u00ean<\/h3>\n

      T\u00ednh nh\u1ea5t qu\u00e1n r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec. M\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u1eb7t t\u00ean h\u1ed7n lo\u1ea1n d\u1eabn \u0111\u1ebfn nh\u1ea7m l\u1eabn v\u00e0 l\u1ed7i. X\u00e2y d\u1ef1ng m\u1ed9t ti\u00eau chu\u1ea9n s\u1edbm v\u00e0 th\u1ef1c thi n\u00f3 tr\u00ean to\u00e0n \u0111\u1ed9i.<\/p>\n

        \n
      • S\u1eed d\u1ee5ng t\u00ean s\u1ed1 \u00edt:<\/strong>C\u00e1c b\u1ea3ng n\u00ean \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ef1c th\u1ec3 duy nh\u1ea5t (v\u00ed d\u1ee5, ng\u01b0\u1eddi d\u00f9ng<\/code>, kh\u00f4ng ph\u1ea3i ng\u01b0\u1eddi d\u00f9ng<\/code>).<\/li>\n
      • D\u1ea5u ph\u00e2n c\u00e1ch nh\u1ea5t qu\u00e1n:<\/strong>S\u1eed d\u1ee5ng snake_case cho t\u00ean b\u1ea3ng v\u00e0 c\u1ed9t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh t\u01b0\u01a1ng th\u00edch tr\u00ean c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u00e0 c\u00f4ng c\u1ee5 kh\u00e1c nhau.<\/li>\n
      • Ti\u1ec1n t\u1ed1 \u0111\u1ec3 r\u00f5 r\u00e0ng m\u1ee5c \u0111\u00edch:<\/strong>S\u1eed d\u1ee5ng ti\u1ec1n t\u1ed1 nh\u01b0 fk_<\/code> cho kh\u00f3a ngo\u1ea1i ho\u1eb7c idx_<\/code> cho ch\u1ec9 m\u1ee5c \u0111\u1ec3 l\u00e0m r\u00f5 m\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang.<\/li>\n
      • Tr\u00e1nh c\u00e1c t\u1eeb kh\u00f3a \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o l\u01b0u:<\/strong>Kh\u00f4ng bao gi\u1edd s\u1eed d\u1ee5ng c\u00e1c t\u1eeb kh\u00f3a nh\u01b0order<\/code>, group<\/code>, ho\u1eb7cselect<\/code> l\u00e0m t\u00ean c\u1ed9t.<\/li>\n<\/ul>\n

        2. Ki\u1ec3u d\u1eef li\u1ec7u v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c<\/h3>\n

        Vi\u1ec7c ch\u1ecdn ki\u1ec3u d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u00f4ng gian l\u01b0u tr\u1eef v\u00e0 t\u1ed1c \u0111\u1ed9 truy v\u1ea5n. C\u00e1c ki\u1ec3u d\u1eef li\u1ec7u qu\u00e1 chung chung s\u1ebd l\u00e3ng ph\u00ed kh\u00f4ng gian v\u00e0 l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh x\u1eed l\u00fd.<\/p>\n

          \n
        • S\u1ed1 nguy\u00ean:<\/strong>S\u1eed d\u1ee5ngTINYINT<\/code> \u0111\u1ec3 l\u00e0m c\u1edd (0-1) ho\u1eb7c \u0111\u1ebfm nh\u1ecf. S\u1eed d\u1ee5ngBIGINT<\/code> ch\u1ec9 khi b\u1ea1n d\u1ef1 ki\u1ebfn quy m\u00f4 l\u1edbn.<\/li>\n
        • Chu\u1ed7i:<\/strong>Tr\u00e1nh s\u1eed d\u1ee5ngTEXT<\/code> cho c\u00e1c gi\u00e1 tr\u1ecb ng\u1eafn. S\u1eed d\u1ee5ngVARCHAR<\/code> v\u1edbi \u0111\u1ed9 d\u00e0i c\u1ee5 th\u1ec3 \u0111\u1ec3 ti\u1ebft ki\u1ec7m kh\u00f4ng gian v\u00e0 cho ph\u00e9p l\u1eadp ch\u1ec9 m\u1ee5c.<\/li>\n
        • Ng\u00e0y th\u00e1ng:<\/strong>S\u1eed d\u1ee5ngTIMESTAMP<\/code> \u0111\u1ec3 l\u01b0u c\u00e1c th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3 v\u00e0DATE<\/code> \u0111\u1ec3 l\u01b0u c\u00e1c ng\u00e0y theo l\u1ecbch. Lu\u00f4n l\u01b0u tr\u1eef \u1edf \u0111\u1ecbnh d\u1ea1ng UTC \u0111\u1ec3 tr\u00e1nh nh\u1ea7m l\u1eabn v\u1ec1 m\u00fai gi\u1edd.<\/li>\n
        • S\u1ed1 th\u1eadp ph\u00e2n:<\/strong> \u0110\u1ed1i v\u1edbi d\u1eef li\u1ec7u t\u00e0i ch\u00ednh, h\u00e3y s\u1eed d\u1ee5ng s\u1ed1 th\u1eadp ph\u00e2n c\u1ed1 \u0111\u1ecbnh thay v\u00ec s\u1ed1 d\u1ea5u ph\u1ea9y \u0111\u1ed9ng \u0111\u1ec3 tr\u00e1nh sai s\u1ed1 l\u00e0m tr\u00f2n.<\/li>\n<\/ul>\n

          Quan h\u1ec7 v\u00e0 Qu\u1ea3n l\u00fd Cardinality \ud83d\udd17<\/h2>\n

          C\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 li\u00ean k\u1ebft v\u1edbi nhau x\u00e1c \u0111\u1ecbnh t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. C\u00e1c m\u1ed1i quan h\u1ec7 kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd t\u1ed1t s\u1ebd d\u1eabn \u0111\u1ebfn c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i v\u00e0 m\u1ea5t d\u1eef li\u1ec7u.<\/p>\n

          1. R\u00e0ng bu\u1ed9c Kh\u00f3a ngo\u1ea1i<\/h3>\n

          Kh\u00f3a ngo\u1ea1i \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu. Ch\u00fang \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. M\u1eb7c d\u00f9 m\u1ed9t s\u1ed1 nh\u00e0 ph\u00e1t tri\u1ec3n v\u00f4 hi\u1ec7u h\u00f3a ch\u00fang \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t, nh\u01b0ng c\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i x\u1eed l\u00fd ch\u00fang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. D\u1ef1a v\u00e0o ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng l\u00e0 d\u1ec5 g\u00e2y l\u1ed7i.<\/p>\n

          2. X\u1eed l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0110a<\/h3>\n

          M\u1ed9t m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111a (v\u00ed d\u1ee5: Sinh vi\u00ean v\u00e0 Kh\u00f3a h\u1ecdc) kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n tr\u1ef1c ti\u1ebfp trong hai b\u1ea3ng. N\u00f3 y\u00eau c\u1ea7u m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft (th\u1ef1c th\u1ec3 li\u00ean k\u1ebft).<\/p>\n

            \n
          • T\u1ea1o m\u1ed9t b\u1ea3ng m\u1edbi ch\u1ee9a c\u00e1c kh\u00f3a ch\u00ednh c\u1ee7a c\u1ea3 hai b\u1ea3ng li\u00ean quan.<\/li>\n
          • Th\u00eam kh\u00f3a ch\u00ednh h\u1ee3p th\u00e0nh g\u1ed3m c\u1ea3 hai kh\u00f3a ngo\u1ea1i.<\/li>\n
          • S\u1eed d\u1ee5ng b\u1ea3ng n\u00e0y \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c thu\u1ed9c t\u00ednh b\u1ed5 sung \u0111\u1eb7c th\u00f9 cho m\u1ed1i quan h\u1ec7, ch\u1eb3ng h\u1ea1n nh\u01b0 ng\u00e0y \u0111\u0103ng k\u00fd.<\/li>\n<\/ul>\n

            3. M\u1ed1i quan h\u1ec7 T\u00f9y ch\u1ecdn so v\u1edbi B\u1eaft bu\u1ed9c<\/h3>\n

            X\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng m\u1ed1i quan h\u1ec7 c\u00f3 b\u1eaft bu\u1ed9c hay kh\u00f4ng. M\u1ed9t NULL<\/code>gi\u00e1 tr\u1ecb trong c\u1ed9t kh\u00f3a ngo\u1ea1i cho th\u1ea5y m\u1ed1i quan h\u1ec7 l\u00e0 t\u00f9y ch\u1ecdn. Quy\u1ebft \u0111\u1ecbnh n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn logic x\u00e1c th\u1ef1c \u1edf l\u1edbp \u1ee9ng d\u1ee5ng.<\/p>\n

            Chi\u1ebfn l\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t \u0111\u1ecdc \ud83c\udfce\ufe0f<\/h2>\n

            Ch\u1ec9 m\u1ee5c l\u00e0 c\u01a1 ch\u1ebf ch\u00ednh \u0111\u1ec3 t\u0103ng t\u1ed1c truy xu\u1ea5t d\u1eef li\u1ec7u. Tuy nhi\u00ean, ch\u00fang kh\u00f4ng mi\u1ec5n ph\u00ed. M\u1ed7i ch\u1ec9 m\u1ee5c ti\u00eau t\u1ed1n kh\u00f4ng gian \u0111\u0129a v\u00e0 l\u00e0m ch\u1eadm c\u00e1c thao t\u00e1c ghi (ch\u00e8n, c\u1eadp nh\u1eadt, x\u00f3a).<\/p>\n

            1. Ch\u1ec9 m\u1ee5c Ch\u00ednh<\/h3>\n

            M\u1ed7i b\u1ea3ng \u0111\u1ec1u c\u1ea7n m\u1ed9t kh\u00f3a ch\u00ednh. Th\u01b0\u1eddng th\u00ec \u0111\u00e2y l\u00e0 ch\u1ec9 m\u1ee5c \u0111\u01b0\u1ee3c gom nh\u00f3m, ngh\u0129a l\u00e0 d\u1eef li\u1ec7u v\u1eadt l\u00fd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef theo th\u1ee9 t\u1ef1 c\u1ee7a kh\u00f3a. Ch\u1ecdn m\u1ed9t kh\u00f3a \u1ed5n \u0111\u1ecbnh v\u00e0 kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. C\u00e1c kh\u00f3a gi\u1ea3 (s\u1ed1 nguy\u00ean t\u1ef1 t\u0103ng) th\u01b0\u1eddng t\u1ed1t h\u01a1n c\u00e1c kh\u00f3a t\u1ef1 nhi\u00ean (nh\u01b0 \u0111\u1ecba ch\u1ec9 email) v\u1ec1 m\u1eb7t hi\u1ec7u su\u1ea5t.<\/p>\n

            2. Ch\u1ec9 m\u1ee5c Ph\u1ee5<\/h3>\n

            S\u1eed d\u1ee5ng ch\u1ec9 m\u1ee5c ph\u1ee5 \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u00e1c truy v\u1ea5n l\u1ecdc ho\u1eb7c s\u1eafp x\u1ebfp theo c\u00e1c c\u1ed9t kh\u00f4ng ph\u1ea3i kh\u00f3a ch\u00ednh. C\u00e1c t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

              \n
            • T\u00ecm ki\u1ebfm theo \u0111\u1ecba ch\u1ec9 email.<\/li>\n
            • L\u1ecdc theo tr\u1ea1ng th\u00e1i ho\u1eb7c danh m\u1ee5c.<\/li>\n
            • S\u1eafp x\u1ebfp k\u1ebft qu\u1ea3 theo ng\u00e0y.<\/li>\n<\/ul>\n

              3. Ch\u1ec9 m\u1ee5c H\u1ee3p th\u00e0nh<\/h3>\n

              Khi truy v\u1ea5n theo nhi\u1ec1u c\u1ed9t, ch\u1ec9 m\u1ee5c h\u1ee3p th\u00e0nh c\u00f3 th\u1ec3 hi\u1ec7u qu\u1ea3 h\u01a1n c\u00e1c ch\u1ec9 m\u1ee5c \u0111\u01a1n c\u1ed9t ri\u00eang bi\u1ec7t. Th\u1ee9 t\u1ef1 c\u00e1c c\u1ed9t trong ch\u1ec9 m\u1ee5c l\u00e0 quan tr\u1ecdng. \u0110\u1eb7t c\u1ed9t c\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc cao nh\u1ea5t \u1edf \u0111\u1ea7u.<\/p>\n

              4. Ch\u1ec9 m\u1ee5c Bao ph\u1ee7<\/h3>\n

              Ch\u1ec9 m\u1ee5c bao ph\u1ee7 bao g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c c\u1ed9t c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u00e1p \u1ee9ng m\u1ed9t truy v\u1ea5n. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u01a1 s\u1edf d\u1eef li\u1ec7u truy xu\u1ea5t d\u1eef li\u1ec7u tr\u1ef1c ti\u1ebfp t\u1eeb ch\u1ec9 m\u1ee5c m\u00e0 kh\u00f4ng c\u1ea7n truy c\u1eadp b\u1ea3ng ch\u00ednh, gi\u1ea3m \u0111\u00e1ng k\u1ec3 I\/O.<\/p>\n

              Thi\u1ebft k\u1ebf cho kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng ngang \ud83c\udf10<\/h2>\n

              M\u1edf r\u1ed9ng theo chi\u1ec1u d\u1ecdc (th\u00eam s\u1ee9c m\u1ea1nh cho m\u1ed9t m\u00e1y ch\u1ee7 duy nh\u1ea5t) c\u00f3 gi\u1edbi h\u1ea1n. Cu\u1ed1i c\u00f9ng, b\u1ea1n ph\u1ea3i ph\u00e2n t\u00e1n d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u n\u00fat. Thi\u1ebft k\u1ebf ERD ph\u1ea3i t\u00ednh \u0111\u1ebfn th\u1ef1c t\u1ebf n\u00e0y.<\/p>\n

              1. Kh\u00f3a Chia nh\u1ecf<\/h3>\n

              Chia nh\u1ecf d\u1eef li\u1ec7u bao g\u1ed3m vi\u1ec7c chia d\u1eef li\u1ec7u ra tr\u00ean nhi\u1ec1u c\u01a1 s\u1edf d\u1eef li\u1ec7u. Vi\u1ec7c ch\u1ecdn kh\u00f3a chia nh\u1ecf l\u00e0 r\u1ea5t quan tr\u1ecdng. N\u00f3 n\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u01b0\u1eddng xuy\u00ean trong c\u00e1c truy v\u1ea5n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u0111\u1ecba ph\u01b0\u01a1ng h\u00f3a d\u1eef li\u1ec7u. N\u1ebfu b\u1ea1n chia nh\u1ecf theo “user_id<\/code>, b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng truy v\u1ea5n t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u cho ng\u01b0\u1eddi d\u00f9ng \u0111\u00f3 tr\u00ean m\u1ed9t n\u00fat duy nh\u1ea5t.<\/p>\n

                \n
              • C\u00e1c kh\u00f3a ph\u00e2n m\u1ea3nh t\u1ed1t:<\/strong> T\u00ednh \u0111a d\u1ea1ng cao, th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c truy v\u1ea5n.<\/li>\n
              • C\u00e1c kh\u00f3a ph\u00e2n m\u1ea3nh k\u00e9m:<\/strong> T\u00ednh \u0111a d\u1ea1ng th\u1ea5p (v\u00ed d\u1ee5 nh\u01b0 country_code<\/code>) ho\u1eb7c hi\u1ebfm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/li>\n<\/ul>\n

                2. Tr\u00e1nh c\u00e1c ph\u00e9p n\u1ed1i ch\u00e9o ph\u00e2n m\u1ea3nh<\/h3>\n

                C\u00e1c ph\u00e9p n\u1ed1i gi\u1eefa c\u00e1c ph\u00e2n m\u1ea3nh kh\u00e1c nhau t\u1ed1n k\u00e9m v\u00e0 ph\u1ee9c t\u1ea1p. Thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 c\u1ee7a b\u1ea1n \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nhu c\u1ea7u th\u1ef1c hi\u1ec7n ch\u00fang. N\u1ebfu b\u1ea1n c\u1ea7n d\u1eef li\u1ec7u t\u1eeb hai th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 n\u1eb1m tr\u00ean c\u00e1c ph\u00e2n m\u1ea3nh kh\u00e1c nhau, h\u00e3y c\u00e2n nh\u1eafc lo\u1ea1i b\u1ecf t\u00ednh chu\u1ea9n h\u00f3a. L\u01b0u tr\u1eef d\u1eef li\u1ec7u kh\u00f3a ngo\u1ea1i c\u1ea7n thi\u1ebft tr\u1ef1c ti\u1ebfp trong b\u1ea3ng \u0111\u1ec3 tr\u00e1nh ph\u00e9p n\u1ed1i.<\/p>\n

                3. Chia t\u00e1ch<\/h3>\n

                Chia t\u00e1ch chia m\u1ed9t b\u1ea3ng l\u1edbn th\u00e0nh c\u00e1c ph\u1ea7n nh\u1ecf h\u01a1n, d\u1ec5 qu\u1ea3n l\u00fd. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo ph\u1ea1m vi (ng\u00e0y th\u00e1ng), danh s\u00e1ch (th\u1ec3 lo\u1ea1i) ho\u1eb7c b\u0103m. \u0110i\u1ec1u n\u00e0y c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00e0 hi\u1ec7u su\u1ea5t truy v\u1ea5n m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i logic \u1ee9ng d\u1ee5ng \u0111\u00e1ng k\u1ec3.<\/p>\n

                Ph\u00e1t tri\u1ec3n v\u00e0 di chuy\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3 \ud83d\udd04<\/h2>\n

                Y\u00eau c\u1ea7u thay \u0111\u1ed5i. C\u00e1c t\u00ednh n\u0103ng m\u1edbi \u0111\u00f2i h\u1ecfi c\u00e1c c\u1ed9t m\u1edbi. C\u00e1c t\u00ednh n\u0103ng c\u0169 b\u1ecb lo\u1ea1i b\u1ecf. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD v\u1eefng ch\u1eafc c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn s\u1ef1 thay \u0111\u1ed5i m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng ch\u1ee9c n\u0103ng hi\u1ec7n t\u1ea1i.<\/p>\n

                1. T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c<\/h3>\n

                Khi th\u00eam t\u00ednh n\u0103ng m\u1edbi, h\u00e3y \u0111\u1ea3m b\u1ea3o c\u00e1c client c\u0169 v\u1eabn c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng. Tr\u01b0\u1edbc ti\u00ean, th\u00eam c\u00e1c c\u1ed9t m\u1edbi v\u1edbi gi\u00e1 tr\u1ecb c\u00f3 th\u1ec3 null. \u0110i\u1ec1n d\u1eef li\u1ec7u d\u1ea7n d\u1ea7n. Kh\u00f4ng x\u00f3a c\u00e1c c\u1ed9t ngay l\u1eadp t\u1ee9c; \u0111\u00e1nh d\u1ea5u ch\u00fang l\u00e0 \u0111\u00e3 l\u1ed7i th\u1eddi v\u00e0 gi\u1eef l\u1ea1i trong th\u1eddi gian di chuy\u1ec3n.<\/p>\n

                2. G\u00e1n phi\u00ean b\u1ea3n cho m\u00f4 h\u00ecnh d\u1eef li\u1ec7u<\/h3>\n

                Theo d\u00f5i c\u00e1c phi\u00ean b\u1ea3n l\u01b0\u1ee3c \u0111\u1ed3. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n ho\u00e0n nguy\u00ean c\u00e1c thay \u0111\u1ed5i n\u1ebfu qu\u00e1 tr\u00ecnh di chuy\u1ec3n g\u00e2y ra s\u1ef1 c\u1ed1 nghi\u00eam tr\u1ecdng. S\u1eed d\u1ee5ng c\u00e1c k\u1ecbch b\u1ea3n di chuy\u1ec3n c\u00f3 t\u00ednh idempotent, ngh\u0129a l\u00e0 ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ch\u1ea1y nhi\u1ec1u l\u1ea7n m\u00e0 kh\u00f4ng g\u00e2y l\u1ed7i.<\/p>\n

                3. X\u1eed l\u00fd di chuy\u1ec3n d\u1eef li\u1ec7u<\/h3>\n

                Di chuy\u1ec3n kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn \u0111\u00f2i h\u1ecfi l\u00ean k\u1ebf ho\u1ea1ch c\u1ea9n th\u1eadn. C\u00e1c kh\u00f3a l\u1edbn c\u00f3 th\u1ec3 ch\u1eb7n l\u01b0u l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t. Th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c di chuy\u1ec3n trong th\u1eddi gian l\u01b0u l\u01b0\u1ee3ng th\u1ea5p ho\u1eb7c s\u1eed d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c tri\u1ec3n khai xanh-\u0111\u1ecf n\u1ebfu c\u00f3 th\u1ec3.<\/p>\n

                Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n

                Ngay c\u1ea3 c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. Nh\u1eadn th\u1ee9c v\u1ec1 nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap b\u1ea1n tr\u00e1nh \u0111\u01b0\u1ee3c ch\u00fang.<\/p>\n

                  \n
                • Thi\u1ebft k\u1ebf qu\u00e1 m\u1ee9c:<\/strong> Thi\u1ebft k\u1ebf cho quy m\u00f4 m\u00e0 b\u1ea1n ch\u01b0a c\u00f3. N\u1ebfu b\u1ea1n \u0111ang b\u1eaft \u0111\u1ea7u, h\u00e3y gi\u1eef \u0111\u01a1n gi\u1ea3n. S\u1ef1 ph\u1ee9c t\u1ea1p s\u1ebd l\u00e0m t\u0103ng chi ph\u00ed v\u00e0 r\u1ee7i ro.<\/li>\n
                • B\u1ecf qua x\u00f3a m\u1ec1m:<\/strong> Kh\u00f4ng bao gi\u1edd x\u00f3a v\u0129nh vi\u1ec5n c\u00e1c b\u1ea3n ghi nh\u1ea1y c\u1ea3m ngay l\u1eadp t\u1ee9c. S\u1eed d\u1ee5ng m\u1ed9t tr\u01b0\u1eddng deleted_at<\/code> th\u1eddi gian thay v\u00e0o \u0111\u00f3. \u0110i\u1ec1u n\u00e0y b\u1ea3o t\u1ed3n c\u00e1c b\u1ea3n ghi ki\u1ec3m to\u00e1n v\u00e0 cho ph\u00e9p kh\u00f4i ph\u1ee5c.<\/li>\n
                • Xung \u0111\u1ed9t t\u00ean g\u1ecdi:<\/strong> S\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t t\u00ean cho b\u1ea3ng v\u00e0 c\u1ed9t s\u1ebd t\u1ea1o ra s\u1ef1 m\u01a1 h\u1ed3. H\u00e3y tu\u00e2n theo quy t\u1eafc b\u1ea3ng \u1edf d\u1ea1ng s\u1ed1 \u00edt.<\/li>\n
                • Thi\u1ebfu r\u00e0ng bu\u1ed9c:<\/strong>D\u1ef1a ho\u00e0n to\u00e0n v\u00e0o logic \u1ee9ng d\u1ee5ng \u0111\u1ec3 th\u1ef1c thi c\u00e1c quy t\u1eafc kinh doanh s\u1ebd d\u1eabn \u0111\u1ebfn l\u1ed7i d\u1eef li\u1ec7u. C\u1ea7n th\u1ef1c thi c\u00e1c r\u00e0ng bu\u1ed9c \u1edf c\u1ea5p \u0111\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
                • B\u1ecf qua b\u1ea3o m\u1eadt:<\/strong>Thi\u1ebft k\u1ebf ph\u1ea3i bao g\u1ed3m c\u00e1c tr\u01b0\u1eddng ki\u1ec3m so\u00e1t truy c\u1eadp. \u0110\u1ea3m b\u1ea3o h\u1ed7 tr\u1ee3 truy c\u1eadp d\u1ef1a tr\u00ean vai tr\u00f2 trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3.<\/li>\n<\/ul>\n

                  Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho \u0111\u1ed9 b\u1ec1n \ud83c\udfc1<\/h2>\n

                  T\u1ea1o ra m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh li\u00ean t\u1ee5c. N\u00f3 \u0111\u00f2i h\u1ecfi gi\u00e1m s\u00e1t, ph\u00e2n t\u00edch v\u00e0 \u0111i\u1ec1u ch\u1ec9nh. Kh\u00f4ng c\u00f3 thi\u1ebft k\u1ebf n\u00e0o ho\u00e0n h\u1ea3o ngay t\u1eeb \u0111\u1ea7u. M\u1ee5c ti\u00eau l\u00e0 t\u1ea1o ra m\u1ed9t n\u1ec1n t\u1ea3ng d\u1ec5 d\u00e0ng thay \u0111\u1ed5i.<\/p>\n

                  Ki\u1ec3m tra \u0111\u1ecbnh k\u1ef3 c\u00e1c truy v\u1ea5n c\u1ee7a b\u1ea1n. X\u00e1c \u0111\u1ecbnh c\u00e1c thao t\u00e1c ch\u1eadm v\u00e0 t\u1ed1i \u01b0u h\u00f3a l\u01b0\u1ee3c \u0111\u1ed3 n\u1ec1n t\u1ea3ng. S\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch \u0111\u1ec3 hi\u1ec3u c\u00e1ch d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c truy c\u1eadp. V\u00f2ng ph\u1ea3n h\u1ed3i n\u00e0y \u0111\u1ea3m b\u1ea3o ki\u1ebfn tr\u00fac c\u1ee7a b\u1ea1n v\u1eabn hi\u1ec7u qu\u1ea3 khi d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n t\u0103ng l\u00ean.<\/p>\n

                  H\u00e3y nh\u1edb r\u1eb1ng c\u00f4ng ngh\u1ec7 lu\u00f4n thay \u0111\u1ed5i. C\u00e1c b\u1ed9 l\u01b0u tr\u1eef m\u1edbi v\u00e0 ng\u00f4n ng\u1eef truy v\u1ea5n m\u1edbi xu\u1ea5t hi\u1ec7n. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 linh ho\u1ea1t th\u00edch nghi t\u1ed1t h\u01a1n v\u1edbi nh\u1eefng thay \u0111\u1ed5i n\u00e0y so v\u1edbi m\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 c\u1ee9ng nh\u1eafc. T\u1eadp trung v\u00e0o c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ed1t l\u00f5i v\u00e0 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y v\u1eabn gi\u1eef nguy\u00ean ngay c\u1ea3 khi c\u00f4ng c\u1ee5 thay \u0111\u1ed5i.<\/p>\n

                  B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc n\u00e0y, b\u1ea1n x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9. Ch\u00fang x\u1eed l\u00fd s\u1ef1 ph\u00e1t tri\u1ec3n m\u1ed9t c\u00e1ch tr\u00f4i ch\u1ea3y v\u00e0 duy tr\u00ec hi\u1ec7u su\u1ea5t d\u01b0\u1edbi t\u1ea3i tr\u1ecdng. \u0110\u00e2y ch\u00ednh l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a vi\u1ec7c b\u1ea3o v\u1ec7 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u1ecfi t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"

                  Vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u gi\u1ed1ng nh\u01b0 vi\u1ec7c x\u00e2y d\u1ef1ng n\u1ec1n m\u00f3ng cho m\u1ed9t t\u00f2a nh\u00e0 ch\u1ecdc tr\u1eddi. N\u1ebfu b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf c\u00f3 l\u1ed7i,…<\/p>\n","protected":false},"author":1,"featured_media":1783,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"B\u1ea3o v\u1ec7 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u01b0\u1edbc t\u01b0\u01a1ng lai: C\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd. Kh\u00e1m ph\u00e1 chu\u1ea9n h\u00f3a, ch\u1ec9 m\u1ee5c v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ph\u00e1t tri\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3 nh\u1eb1m ph\u00e1t tri\u1ec3n l\u00e2u d\u00e0i.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[86],"tags":[82,85],"class_list":["post-1782","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nB\u1ea3o v\u1ec7 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u01b0\u1edbc t\u01b0\u01a1ng lai: C\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd. Kh\u00e1m ph\u00e1 chu\u1ea9n h\u00f3a, ch\u1ec9 m\u1ee5c v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ph\u00e1t tri\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3 nh\u1eb1m ph\u00e1t tri\u1ec3n l\u00e2u d\u00e0i.\" \/>\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\/future-proof-database-scalable-erd-design-principles\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u1ea3o v\u1ec7 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u01b0\u1edbc t\u01b0\u01a1ng lai: C\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd. 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