{"id":1659,"date":"2026-03-23T11:07:48","date_gmt":"2026-03-23T11:07:48","guid":{"rendered":"https:\/\/www.viz-read.com\/vi\/common-erd-confusion-debunking-myths\/"},"modified":"2026-03-23T11:07:48","modified_gmt":"2026-03-23T11:07:48","slug":"common-erd-confusion-debunking-myths","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/vi\/common-erd-confusion-debunking-myths\/","title":{"rendered":"Nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn v\u1ec1 ERD: B\u00f3c t\u00e1ch nh\u1eefng \u0111\u1ecbnh ki\u1ebfn m\u00e0 m\u1ed7i k\u1ef9 s\u01b0 tr\u1ebb \u0111\u1ec1u ph\u1ea3i \u0111\u1ed1i m\u1eb7t"},"content":{"rendered":"

Thi\u1ebft k\u1ebf m\u1ed9t m\u00f4 h\u00ecnh d\u1eef li\u1ec7u v\u1eefng ch\u1eafc l\u00e0 m\u1ed9t trong nh\u1eefng k\u1ef9 n\u0103ng quan tr\u1ecdng nh\u1ea5t \u0111\u1ed1i v\u1edbi k\u1ef9 s\u01b0 backend ho\u1eb7c ki\u1ebfn tr\u00fac vi\u00ean d\u1eef li\u1ec7u. \u1ede trung t\u00e2m c\u1ee7a qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0 s\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3 – Quan h\u1ec7 (ERD). N\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1ch th\u00f4ng tin \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef, truy xu\u1ea5t v\u00e0 li\u00ean k\u1ebft trong m\u1ed9t h\u1ec7 th\u1ed1ng. D\u00f9 c\u00f3 t\u1ea7m quan tr\u1ecdng n\u1ec1n t\u1ea3ng, nhi\u1ec1u k\u1ef9 s\u01b0 tr\u1ebb ti\u1ebfp c\u1eadn vi\u1ec7c t\u1ea1o ERD v\u1edbi nh\u1eefng hi\u1ec3u l\u1ea7m c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn n\u1ee3 c\u1ea5u tr\u00fac trong giai \u0111o\u1ea1n sau c\u1ee7a v\u00f2ng \u0111\u1eddi d\u1ef1 \u00e1n.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y gi\u1ea3i quy\u1ebft nh\u1eefng hi\u1ec3u l\u1ea7m dai d\u1eb3ng nh\u1ea5t xung quanh thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch l\u00e0m r\u00f5 nh\u1eefng \u0111i\u1ec3m n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 h\u1ee3p l\u00fd v\u1ec1 m\u1eb7t logic. H\u00e3y c\u00f9ng kh\u00e1m ph\u00e1 th\u1ef1c t\u1ebf \u0111\u1eb1ng sau nh\u1eefng hi\u1ec3u l\u1ea7m \u0111\u00f3.<\/p>\n

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\"Kawaii-style<\/figure>\n<\/div>\n

1. ERD \u0111\u1ea1i di\u1ec7n cho c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u cu\u1ed1i c\u00f9ng \ud83d\udcd0<\/h2>\n

M\u1ed9t hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn l\u00e0 s\u01a1 \u0111\u1ed3 ban \u0111\u1ea7u \u0111\u01b0\u1ee3c v\u1ebd trong giai \u0111o\u1ea1n l\u1eadp k\u1ebf ho\u1ea1ch ph\u1ea3i gi\u1eef nguy\u00ean su\u1ed1t qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n. Nhi\u1ec1u k\u1ef9 s\u01b0 tr\u1ebb tin r\u1eb1ng ERD l\u00e0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i m\u00e0 kh\u00f4ng t\u1ed1n k\u00e9m \u0111\u00e1ng k\u1ec3. D\u00f9 t\u00ednh nh\u1ea5t qu\u00e1n l\u00e0 r\u1ea5t quan tr\u1ecdng, nh\u01b0ng coi s\u01a1 \u0111\u1ed3 nh\u01b0 m\u1ed9t t\u1ea5m bia \u0111\u00e1 c\u1ee9ng nh\u1eafc th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng k\u00e9m.<\/p>\n

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  • Thi\u1ebft k\u1ebf theo t\u1eebng b\u01b0\u1edbc l\u1eb7p:<\/strong>M\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i. Khi y\u00eau c\u1ea7u thay \u0111\u1ed5i, l\u01b0\u1ee3c \u0111\u1ed3 ph\u1ea3i thay \u0111\u1ed5i theo ch\u00fang.<\/li>\n
  • T\u00e1i c\u1ea5u tr\u00fac:<\/strong>Th\u01b0\u1eddng th\u00ec t\u1ed1t h\u01a1n l\u00e0 n\u00ean t\u00e1i c\u1ea5u tr\u00fac c\u1ea5u tr\u00fac b\u1ea3ng ngay t\u1eeb \u0111\u1ea7u thay v\u00ec mang theo n\u1ee3 k\u1ef9 thu\u1eadt trong nhi\u1ec1u n\u0103m.<\/li>\n
  • T\u00e0i li\u1ec7u:<\/strong>ERD \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng. N\u00f3 c\u1ea7n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt m\u1ed7i khi c\u00f3 thay \u0111\u1ed5i v\u1ec1 c\u1ea5u tr\u00fac.<\/li>\n<\/ul>\n

    Thay v\u00ec xem s\u01a1 \u0111\u1ed3 nh\u01b0 \u0111i\u1ec3m \u0111\u1ebfn cu\u1ed1i c\u00f9ng, h\u00e3y coi n\u00f3 nh\u01b0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p l\u1ea1i hi\u1ec3u bi\u1ebft hi\u1ec7n t\u1ea1i. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p Agile khuy\u1ebfn kh\u00edch t\u00ednh linh ho\u1ea1t. N\u1ebfu m\u1ed9t y\u00eau c\u1ea7u m\u1edbi xu\u1ea5t hi\u1ec7n \u0111\u00f2i h\u1ecfi m\u1ed1i quan h\u1ec7 kh\u00e1c gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3, s\u01a1 \u0111\u1ed3 c\u1ea7n ph\u1ea3n \u00e1nh s\u1ef1 thay \u0111\u1ed5i \u0111\u00f3 ngay l\u1eadp t\u1ee9c. Vi\u1ec7c tu\u00e2n th\u1ee7 c\u1ee9ng nh\u1eafc m\u1ed9t b\u1ea3n ph\u00e1c th\u1ea3o ban \u0111\u1ea7u c\u00f3 th\u1ec3 k\u00ecm h\u00e3m s\u1ef1 \u0111\u1ed5i m\u1edbi v\u00e0 khi\u1ebfn vi\u1ec7c t\u00edch h\u1ee3p t\u00ednh n\u0103ng trong t\u01b0\u01a1ng lai tr\u1edf n\u00ean kh\u00f3 kh\u0103n h\u01a1n r\u1ea5t nhi\u1ec1u.<\/p>\n

    2. Nhi\u1ec1u b\u1ea3ng h\u01a1n lu\u00f4n t\u1ed1t h\u01a1n cho vi\u1ec7c t\u1ed5 ch\u1ee9c \ud83d\uddc2\ufe0f<\/h2>\n

    C\u00f3 xu h\u01b0\u1edbng \u1edf nh\u1eefng ng\u01b0\u1eddi m\u1edbi l\u00e0 qu\u00e1 m\u1ee9c chu\u1ea9n h\u00f3a. L\u00fd lu\u1eadn cho r\u1eb1ng vi\u1ec7c t\u1ea1o m\u1ed9t b\u1ea3ng ri\u00eang bi\u1ec7t cho m\u1ed7i kh\u00e1i ni\u1ec7m s\u1ebd gi\u00fap c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1ea1ch s\u1ebd. Tuy nhi\u00ean, vi\u1ec7c ph\u00e2n m\u1ea3nh qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a truy v\u1ea5n.<\/p>\n

    H\u00e3y c\u00e2n nh\u1eafc c\u00e1c \u0111i\u1ec3m \u0111\u00e1nh \u0111\u1ed5i khi quy\u1ebft \u0111\u1ecbnh c\u00f3 n\u00ean t\u1ea1o m\u1ed9t b\u1ea3ng m\u1edbi hay kh\u00f4ng:<\/p>\n

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    • \u0110\u1ed9 ph\u1ee9c t\u1ea1p truy v\u1ea5n:<\/strong>M\u1ed7i b\u1ea3ng m\u1edbi \u0111\u1ec1u t\u1ea1o ra m\u1ed9t ph\u00e9p n\u1ed1i m\u1edbi. Qu\u00e1 nhi\u1ec1u ph\u00e9p n\u1ed1i s\u1ebd l\u00e0m ch\u1eadm c\u00e1c thao t\u00e1c \u0111\u1ecdc.<\/li>\n
    • Kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec:<\/strong>M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 v\u1edbi h\u00e0ng tr\u0103m b\u1ea3ng c\u00f3 th\u1ec3 tr\u1edf n\u00ean kh\u00f3 thao t\u00e1c v\u00e0 hi\u1ec3u r\u00f5.<\/li>\n
    • Chi ph\u00ed l\u01b0u tr\u1eef:<\/strong>D\u00f9 l\u01b0u tr\u1eef r\u1ebb, nh\u01b0ng chi ph\u00ed cho ch\u1ec9 m\u1ee5c v\u00e0 s\u1ef1 gia t\u0103ng nh\u1eadt k\u00fd giao d\u1ecbch c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 khi m\u1edf r\u1ed9ng quy m\u00f4.<\/li>\n<\/ul>\n

      M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ed1i \u0111a h\u00f3a s\u1ed1 l\u01b0\u1ee3ng b\u1ea3ng, m\u00e0 l\u00e0 t\u1ed1i \u0111a h\u00f3a t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 hi\u1ec7u qu\u1ea3 truy xu\u1ea5t. \u0110\u00f4i khi, c\u1ea5u tr\u00fac kh\u00f4ng chu\u1ea9n h\u00f3a l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1eafn cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 nhu c\u1ea7u \u0111\u1ecdc cao. Quy\u1ebft \u0111\u1ecbnh ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c m\u1eabu truy c\u1eadp c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>\n

      \u0110i\u1ec3m \u0111\u00e1nh \u0111\u1ed5i gi\u1eefa chu\u1ea9n h\u00f3a v\u00e0 kh\u00f4ng chu\u1ea9n h\u00f3a<\/h3>\n\n\n\n\n\n\n\n\n
      Kh\u00eda c\u1ea1nh<\/th>\nChu\u1ea9n h\u00f3a<\/th>\nKh\u00f4ng chu\u1ea9n h\u00f3a<\/th>\n<\/tr>\n<\/thead>\n
      T\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/strong><\/td>\nCao<\/td>\nTh\u1ea5p h\u01a1n (y\u00eau c\u1ea7u logic \u1edf \u1ee9ng d\u1ee5ng)<\/td>\n<\/tr>\n
      Hi\u1ec7u su\u1ea5t ghi<\/strong><\/td>\nCh\u1eadm h\u01a1n (nhi\u1ec1u r\u00e0ng bu\u1ed9c h\u01a1n)<\/td>\nNhanh h\u01a1n<\/td>\n<\/tr>\n
      Hi\u1ec7u su\u1ea5t \u0111\u1ecdc<\/strong><\/td>\nCh\u1eadm h\u01a1n (nhi\u1ec1u ph\u00e9p n\u1ed1i h\u01a1n)<\/td>\nNhanh h\u01a1n<\/td>\n<\/tr>\n
      Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong><\/td>\nOLTP (H\u1ec7 th\u1ed1ng giao d\u1ecbch)<\/td>\nOLAP (B\u00e1o c\u00e1o v\u00e0 ph\u00e2n t\u00edch)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      3. Cardinality l\u00e0 th\u00f4ng tin t\u00f9y ch\u1ecdn \ud83d\udcc9<\/h2>\n

      M\u1ed9t trong nh\u1eefng l\u1ed7i g\u00e2y h\u1ea1i nh\u1ea5t khi t\u1ea1o s\u01a1 \u0111\u1ed3 ERD l\u00e0 b\u1ecf qua cardinality. Cardinality x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng m\u1ed1i quan h\u1ec7 gi\u1eefa hai th\u1ef1c th\u1ec3 (v\u00ed d\u1ee5: m\u1ed9t-m\u1ed9t, m\u1ed9t-nhi\u1ec1u). M\u1ed9t s\u1ed1 k\u1ef9 s\u01b0 ch\u1ec9 t\u1eadp trung v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 qu\u00ean m\u1ea5t c\u00e1c k\u1ebft n\u1ed1i.<\/p>\n

      Kh\u00f4ng c\u00f3 cardinality \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, b\u1ed9 x\u1eed l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 th\u1ef1c thi c\u00e1c quy t\u1eafc d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i v\u00e0 tr\u1ea1ng th\u00e1i kh\u00f4ng nh\u1ea5t qu\u00e1n.<\/p>\n

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      • M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> Hi\u1ebfm g\u1eb7p, nh\u01b0ng h\u1eefu \u00edch cho b\u1ea3o m\u1eadt ho\u1eb7c chia nh\u1ecf c\u00e1c b\u1ea3ng l\u1edbn.<\/li>\n
      • M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N):<\/strong> M\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t (v\u00ed d\u1ee5: m\u1ed9t Ng\u01b0\u1eddi d\u00f9ng c\u00f3 nhi\u1ec1u \u0110\u01a1n h\u00e0ng).<\/li>\n
      • Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N):<\/strong> Y\u00eau c\u1ea7u m\u1ed9t b\u1ea3ng giao \u0111i\u1ec3m \u0111\u1ec3 gi\u1ea3i quy\u1ebft (v\u00ed d\u1ee5: Sinh vi\u00ean v\u00e0 Kh\u00f3a h\u1ecdc).<\/li>\n<\/ul>\n

        Khi b\u1ea1n x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y, b\u1ea1n \u0111ang truy\u1ec1n \u0111\u1ea1t \u00fd \u0111\u1ecbnh \u0111\u1ebfn c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n kh\u00e1c. M\u1ed9t r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i kh\u00f4ng ch\u1ec9 l\u00e0 y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt; \u0111\u00f3 l\u00e0 m\u1ed9t khai b\u00e1o ng\u1eef ngh\u0129a v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn ch\u00ednh n\u00f3.<\/p>\n

        4. Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean kh\u00f4ng quan tr\u1ecdng \ud83c\udff7\ufe0f<\/h2>\n

        R\u1ea5t c\u00e1m d\u1ed7 khi s\u1eed d\u1ee5ng c\u00e1c t\u00ean ng\u1eafn, kh\u00f3 hi\u1ec3u nh\u01b0tbl_usr<\/code> ho\u1eb7c col_id_1<\/code> \u0111\u1ec3 ti\u1ebft ki\u1ec7m th\u1eddi gian g\u00f5. Tuy nhi\u00ean, t\u00ean m\u00e3 v\u00e0 t\u00ean l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c \u0111\u1ecdc nhi\u1ec1u h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi vi\u1ec7c \u0111\u01b0\u1ee3c vi\u1ebft ra.<\/p>\n

        C\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean r\u00f5 r\u00e0ng gi\u00fap gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c. Khi m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n m\u1edbi gia nh\u1eadp \u0111\u1ed9i nh\u00f3m, h\u1ecd n\u00ean c\u00f3 th\u1ec3 hi\u1ec3u c\u1ea5u tr\u00fac l\u01b0\u1ee3c \u0111\u1ed3 trong v\u00f2ng v\u00e0i ph\u00fat.<\/p>\n

        C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t bao g\u1ed3m:<\/p>\n

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        • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t phong c\u00e1ch (snake_case, camelCase) tr\u00ean to\u00e0n b\u1ed9 d\u1ef1 \u00e1n.<\/li>\n
        • T\u00ednh m\u00f4 t\u1ea3:<\/strong>T\u00ean b\u1ea3ng n\u00ean \u0111\u1ea1i di\u1ec7n cho th\u1ef1c th\u1ec3 (v\u00ed d\u1ee5: “ng\u01b0\u1eddi d\u00f9ng<\/code>, kh\u00f4ng ph\u1ea3it1<\/code>).<\/li>\n
        • S\u1ed1 nhi\u1ec1u:<\/strong>N\u00f3i chung, c\u00e1c b\u1ea3ng \u0111\u1ea1i di\u1ec7n cho c\u00e1c t\u1eadp h\u1ee3p, v\u00ec v\u1eady t\u00ean \u1edf d\u1ea1ng s\u1ed1 nhi\u1ec1u th\u01b0\u1eddng r\u00f5 r\u00e0ng h\u01a1n (v\u00ed d\u1ee5 nh\u01b0 \u0111\u01a1n h\u00e0ng<\/code> so v\u1edbi \u0111\u01a1n h\u00e0ng<\/code>).<\/li>\n
        • Tr\u00e1nh s\u1eed d\u1ee5ng t\u1eeb kh\u00f3a \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1eef:<\/strong> Kh\u00f4ng s\u1eed d\u1ee5ng c\u00e1c t\u1eeb kh\u00f3a nh\u01b0 nh\u00f3m<\/code> ho\u1eb7c \u0111\u01a1n h\u00e0ng<\/code> m\u00e0 kh\u00f4ng c\u1ea7n tho\u00e1t k\u00fd t\u1ef1.<\/li>\n<\/ul>\n

          D\u00e0nh th\u1eddi gian cho c\u00e1c quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch b\u1eb1ng c\u00e1ch gi\u1ea3m th\u1eddi gian g\u1ee1 l\u1ed7i v\u00e0 \u00edt hi\u1ec3u nh\u1ea7m h\u01a1n trong qu\u00e1 tr\u00ecnh xem x\u00e9t m\u00e3 ngu\u1ed3n.<\/p>\n

          5. Kh\u00f3a ngo\u1ea1i l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t \u26a1<\/h2>\n

          M\u1ed9t quan ni\u1ec7m ph\u1ed5 bi\u1ebfn cho r\u1eb1ng c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i g\u00e2y th\u00eam chi ph\u00ed qu\u00e1 l\u1edbn cho c\u00e1c thao t\u00e1c ghi, do \u0111\u00f3 n\u00ean lo\u1ea1i b\u1ecf \u0111\u1ec3 thay b\u1eb1ng ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng. M\u1eb7c d\u00f9 \u0111\u00fang l\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c l\u00e0m t\u0103ng th\u1eddi gian x\u1eed l\u00fd, nh\u01b0ng chi ph\u00ed n\u00e0y th\u01b0\u1eddng kh\u00f4ng \u0111\u00e1ng k\u1ec3 so v\u1edbi r\u1ee7i ro g\u00e2y h\u1ecfng d\u1eef li\u1ec7u.<\/p>\n

          Ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng d\u1ec5 b\u1ecb l\u1ed7i do \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh v\u00e0 l\u1ed7i ph\u1ea7n m\u1ec1m. M\u1ed9t r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 nguy\u00ean t\u1eed v\u00e0 \u0111\u01b0\u1ee3c th\u1ef1c thi b\u1edfi ch\u00ednh \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n

            \n
          • To\u00e0n v\u1eb9n:<\/strong>Kh\u00f3a ngo\u1ea1i ng\u0103n d\u1eef li\u1ec7u b\u1ecb b\u1ecf r\u01a1i m\u1ed9t c\u00e1ch t\u1ef1 \u0111\u1ed9ng.<\/li>\n
          • T\u1ed1i \u01b0u h\u00f3a:<\/strong>C\u00e1c \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i t\u1ed1i \u01b0u h\u00f3a c\u00e1c thao t\u00e1c n\u1ed1i d\u1ef1a tr\u00ean c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y.<\/li>\n
          • T\u1ef1 \u0111\u1ed9ng lan truy\u1ec1n:<\/strong> CASCADE<\/code>C\u00e1c thao t\u00e1c x\u00f3a t\u1ef1 \u0111\u1ed9ng gi\u00fap qu\u1ea3n l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p m\u00e0 kh\u00f4ng c\u1ea7n m\u00e3 d\u1ecdn d\u1eb9p th\u1ee7 c\u00f4ng.<\/li>\n<\/ul>\n

            Ch\u1ec9 v\u00f4 hi\u1ec7u h\u00f3a c\u00e1c r\u00e0ng bu\u1ed9c trong c\u00e1c t\u00ecnh hu\u1ed1ng t\u1ea3i h\u00e0ng lo\u1ea1t hi\u1ec7u su\u1ea5t cao c\u1ee5 th\u1ec3, n\u01a1i hi\u1ec7u su\u1ea5t l\u00e0 \u0111i\u1ec3m ngh\u1ebdn tuy\u1ec7t \u0111\u1ed1i v\u00e0 to\u00e0n v\u1eb9n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd t\u1eeb b\u00ean ngo\u00e0i. \u0110\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng giao d\u1ecbch ti\u00eau chu\u1ea9n, h\u00e3y gi\u1eef ch\u00fang \u0111\u01b0\u1ee3c b\u1eadt.<\/p>\n

            6. Thi\u1ebft k\u1ebf ERD ch\u1ec9 d\u00e0nh cho c\u00e1c qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u \ud83e\udd16<\/h2>\n

            C\u00e1c k\u1ef9 s\u01b0 c\u1ea5p th\u1ea5p th\u01b0\u1eddng cho r\u1eb1ng vi\u1ec7c thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 l\u00e0 c\u00f4ng vi\u1ec7c c\u1ee7a ng\u01b0\u1eddi kh\u00e1c, c\u1ee5 th\u1ec3 l\u00e0 DBA. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra s\u1ef1 t\u00e1ch bi\u1ec7t gi\u1eefa logic \u1ee9ng d\u1ee5ng v\u00e0 l\u1edbp l\u01b0u tr\u1eef d\u1eef li\u1ec7u.<\/p>\n

            C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n \u1ee9ng d\u1ee5ng ph\u1ea3i hi\u1ec3u m\u00f4 h\u00ecnh d\u1eef li\u1ec7u v\u00ec h\u1ecd vi\u1ebft c\u00e1c truy v\u1ea5n t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u00f3. N\u1ebfu l\u01b0\u1ee3c \u0111\u1ed3 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi logic \u1ee9ng d\u1ee5ng, m\u00e3 ngu\u1ed3n s\u1ebd tr\u1edf n\u00ean k\u00e9m hi\u1ec7u qu\u1ea3 v\u00e0 d\u1ec5 b\u1ecb l\u1ed7i.<\/p>\n

              \n
            • H\u1ee3p t\u00e1c:<\/strong>C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 DBAs n\u00ean h\u1ee3p t\u00e1c s\u1edbm trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf.<\/li>\n
            • T\u1ea1o m\u00e3:<\/strong>Nhi\u1ec1u ORMs (b\u1ed9 \u00e1nh x\u1ea1 \u0111\u1ed1i t\u01b0\u1ee3ng-quan h\u1ec7) ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o s\u01a1 \u0111\u1ed3 ER \u0111\u1ec3 t\u1ea1o c\u00e1c l\u1edbp l\u01b0u tr\u1eef.<\/li>\n
            • G\u1ee1 l\u1ed7i:<\/strong>Hi\u1ec3u r\u00f5 c\u00e1c m\u1ed1i quan h\u1ec7 gi\u00fap ch\u1ea9n \u0111o\u00e1n c\u00e1c truy v\u1ea5n ch\u1eadm v\u00e0 s\u1ef1 b\u1ea5t nh\u1ea5t trong d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

              Tr\u00e1ch nhi\u1ec7m s\u1edf h\u1eefu m\u00f4 h\u00ecnh d\u1eef li\u1ec7u l\u00e0 chung. M\u1ed9t \u1ee9ng d\u1ee5ng kh\u00f4ng th\u1ec3 truy c\u1eadp d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng th\u1ea5t b\u1ea1i, b\u1ea5t k\u1ec3 giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1t \u0111\u1ebfn \u0111\u00e2u.<\/p>\n

              7. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 ph\u00f9 h\u1ee3p v\u1edbi m\u1ecdi tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng \ud83d\udd04<\/h2>\n

              Kh\u00f4ng c\u00f3 c\u00e1ch thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00e0o l\u00e0 ‘t\u1ed1t nh\u1ea5t’ duy nh\u1ea5t. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u cho d\u00f2ng th\u1eddi gian m\u1ea1ng x\u00e3 h\u1ed9i s\u1ebd kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t so v\u1edbi l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho s\u1ed5 k\u1ebf to\u00e1n t\u00e0i ch\u00ednh.<\/p>\n

              Hi\u1ec3u r\u00f5 c\u00e1c m\u1eabu truy c\u1eadp quan tr\u1ecdng h\u01a1n vi\u1ec7c tu\u00e2n theo m\u1ed9t m\u1eabu c\u1ee9ng nh\u1eafc.<\/p>\n

                \n
              • T\u1eadp trung v\u00e0o \u0111\u1ecdc:<\/strong>\u01afu ti\u00ean lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/li>\n
              • T\u1eadp trung v\u00e0o ghi:<\/strong>\u01afu ti\u00ean chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c to\u00e0n v\u1eb9n nghi\u00eam ng\u1eb7t.<\/li>\n
              • Truy v\u1ea5n ph\u1ee9c t\u1ea1p:<\/strong>\u0110\u1ea3m b\u1ea3o c\u00e1c ch\u1ec9 m\u1ee5c \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean c\u00e1c c\u1ed9t th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trongWHERE<\/code>c\u00e2u l\u1ec7nh.<\/li>\n<\/ul>\n

                M\u1ed7i h\u1ec7 th\u1ed1ng \u0111\u1ec1u c\u00f3 y\u00eau c\u1ea7u ri\u00eang bi\u1ec7t. M\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn chung th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn gi\u1ea3i ph\u00e1p ho\u1ea1t \u0111\u1ed9ng ‘\u0111\u01b0\u1ee3c’ nh\u01b0ng th\u1ea5t b\u1ea1i d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n t\u1ea3i c\u1ee5 th\u1ec3. Ph\u00e2n t\u00edch t\u1ea3i c\u00f4ng vi\u1ec7c c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n tr\u01b0\u1edbc khi x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac cu\u1ed1i c\u00f9ng.<\/p>\n

                8. S\u01a1 \u0111\u1ed3 ho\u00e0n ch\u1ec9nh ngay c\u1ea3 khi kh\u00f4ng c\u00f3 thu\u1ed9c t\u00ednh \ud83d\udcdd<\/h2>\n

                R\u1ea5t th\u01b0\u1eddng th\u1ea5y c\u00e1c s\u01a1 \u0111\u1ed3 th\u1ec3 hi\u1ec7n c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 m\u1ed1i quan h\u1ec7 nh\u01b0ng thi\u1ebfu \u0111\u1ecbnh ngh\u0129a chi ti\u1ebft v\u1ec1 thu\u1ed9c t\u00ednh. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD ho\u00e0n ch\u1ec9nh ph\u1ea3i x\u00e1c \u0111\u1ecbnh ki\u1ec3u d\u1eef li\u1ec7u, r\u00e0ng bu\u1ed9c v\u00e0 gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh.<\/p>\n

                Kh\u00f4ng c\u00f3 m\u1ee9c \u0111\u1ed9 chi ti\u1ebft n\u00e0y, s\u01a1 \u0111\u1ed3 ch\u1ec9 l\u00e0 m\u1ed9t b\u1ea3n ph\u00e1c th\u1ea3o. N\u00f3 kh\u00f4ng th\u1ec3 d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c t\u1eadp l\u1ec7nh di chuy\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c t\u1ebf.<\/p>\n

                C\u00e1c thu\u1ed9c t\u00ednh thi\u1ebft y\u1ebfu c\u1ea7n x\u00e1c \u0111\u1ecbnh bao g\u1ed3m:<\/p>\n

                  \n
                • Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> S\u1ed1 nguy\u00ean, Varchar, Boolean, Th\u1eddi \u0111i\u1ec3m.<\/li>\n
                • R\u00e0ng bu\u1ed9c:<\/strong> Kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ec3 tr\u1ed1ng, Duy nh\u1ea5t, M\u1eb7c \u0111\u1ecbnh.<\/li>\n
                • \u0110\u1ed9 d\u00e0i:<\/strong>Gi\u1edbi h\u1ea1n k\u00fd t\u1ef1 cho c\u00e1c tr\u01b0\u1eddng chu\u1ed7i.<\/li>\n
                • Ch\u1ec9 m\u1ee5c:<\/strong> Nh\u1eefng tr\u01b0\u1eddng n\u00e0o c\u1ea7n t\u1ed1i \u01b0u h\u00f3a t\u00ecm ki\u1ebfm.<\/li>\n<\/ul>\n

                  Thi\u1ebfu chi ti\u1ebft thu\u1ed9c t\u00ednh th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn s\u1ef1 m\u01a1 h\u1ed3 trong giai \u0111o\u1ea1n tri\u1ec3n khai, g\u00e2y ra c\u00e1c thay \u0111\u1ed5i v\u00e0o ph\u00fat cu\u1ed1i v\u00e0 l\u1ed7i ti\u1ec1m t\u00e0ng.<\/p>\n

                  9. Kh\u00f3a ch\u00ednh ph\u1ea3i l\u00e0 s\u1ed1 nguy\u00ean \ud83d\udd22<\/h2>\n

                  M\u1eb7c d\u00f9 c\u00e1c s\u1ed1 nguy\u00ean t\u1ef1 t\u0103ng l\u00e0 chi\u1ebfn l\u01b0\u1ee3c kh\u00f3a ch\u00ednh ph\u1ed5 bi\u1ebfn nh\u1ea5t, nh\u01b0ng ch\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 l\u1ef1a ch\u1ecdn duy nh\u1ea5t. Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, kh\u00f3a s\u1ed1 nguy\u00ean c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn xung \u0111\u1ed9t.<\/p>\n

                    \n
                  • UUIDs:<\/strong>C\u00e1c \u0111\u1ecbnh danh duy nh\u1ea5t to\u00e0n c\u1ea7u r\u1ea5t h\u1eefu \u00edch cho ki\u1ebfn tr\u00fac microservices.<\/li>\n
                  • Kh\u00f3a k\u1ebft h\u1ee3p:<\/strong>\u0110\u00f4i khi m\u1ed9t t\u1ed5 h\u1ee3p c\u00e1c c\u1ed9t m\u1edbi l\u00e0 \u0111\u1ecbnh danh duy nh\u1ea5t th\u1ef1c s\u1ef1.<\/li>\n
                  • Kh\u00f3a gi\u1ea3 vs. Kh\u00f3a t\u1ef1 nhi\u00ean:<\/strong>Kh\u00f3a gi\u1ea3 (\u0111\u01b0\u1ee3c sinh ra) t\u00e1ch bi\u1ec7t danh t\u00ednh kh\u1ecfi logic kinh doanh.<\/li>\n<\/ul>\n

                    Vi\u1ec7c ch\u1ecdn lo\u1ea1i kh\u00f3a ph\u00f9 h\u1ee3p \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c gom nh\u00f3m, l\u1eadp ch\u1ec9 m\u1ee5c v\u00e0 hi\u1ec7u su\u1ea5t kh\u00f3a ngo\u1ea1i. S\u1ed1 nguy\u00ean th\u01b0\u1eddng nhanh h\u01a1n cho c\u00e1c thao t\u00e1c n\u1ed1i, nh\u01b0ng UUIDs mang l\u1ea1i ph\u00e2n b\u1ed1 t\u1ed1t h\u01a1n trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n m\u1ea3nh.<\/p>\n

                    10. Thi\u1ebft k\u1ebf ERD l\u00e0 m\u1ed9t nhi\u1ec7m v\u1ee5 m\u1ed9t l\u1ea7n \ud83d\udeab<\/h2>\n

                    Thi\u1ebft k\u1ebf l\u01b0\u1ee3c \u0111\u1ed3 r\u1ed3i b\u1ecf qua l\u00e0 m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn nguy hi\u1ec3m. H\u1ec7 th\u1ed1ng thay \u0111\u1ed5i, nhu c\u1ea7u d\u1eef li\u1ec7u c\u0169ng thay \u0111\u1ed5i. M\u1ed9t thi\u1ebft k\u1ebf t\u1ed1t c\u00e1ch \u0111\u00e2y ba n\u0103m c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh g\u00e1nh n\u1eb7ng ng\u00e0y nay.<\/p>\n

                      \n
                    • Ki\u1ec3m to\u00e1n \u0111\u1ecbnh k\u1ef3:<\/strong>\u0110\u00e1nh gi\u00e1 \u0111\u1ecbnh k\u1ef3 l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c b\u1ea3ng ho\u1eb7c c\u1ed9t kh\u00f4ng s\u1eed d\u1ee5ng.<\/li>\n
                    • Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong>Xem c\u00e1c thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3 nh\u01b0 m\u00e3 ngu\u1ed3n. S\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 di chuy\u1ec3n \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c phi\u00ean b\u1ea3n.<\/li>\n
                    • V\u00f2ng ph\u1ea3n h\u1ed3i:<\/strong>L\u1eafng nghe d\u1eef li\u1ec7u hi\u1ec7u su\u1ea5t \u1ee9ng d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m ngh\u1ebdn c\u1ea5u tr\u00fac.<\/li>\n<\/ul>\n

                      Duy tr\u00ec m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u1ecfe m\u1ea1nh \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd li\u00ean t\u1ee5c. B\u1ecf qua s\u1ee9c kh\u1ecfe l\u01b0\u1ee3c \u0111\u1ed3 cho \u0111\u1ebfn khi v\u1ea5n \u0111\u1ec1 hi\u1ec7u su\u1ea5t x\u1ea3y ra l\u00e0 chi\u1ebfn l\u01b0\u1ee3c ph\u1ea3n \u1ee9ng, th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn s\u1ef1 c\u1ed1.<\/p>\n

                      11. C\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p lu\u00f4n l\u00e0 x\u1ea5u \ud83d\udeab<\/h2>\n

                      M\u1ed9t s\u1ed1 k\u1ef9 s\u01b0 s\u1ee3 c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p (nh\u01b0 m\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy ho\u1eb7c c\u00e1c c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p s\u00e2u) v\u00e0 \u0111\u01a1n gi\u1ea3n h\u00f3a ch\u00fang qu\u00e1 m\u1ee9c. D\u00f9 s\u1ef1 \u0111\u01a1n gi\u1ea3n l\u00e0 t\u1ed1t, nh\u01b0ng \u0111\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng logic kinh doanh.<\/p>\n

                      H\u00e3y xem x\u00e9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u1ee7a s\u01a1 \u0111\u1ed3 t\u1ed5 ch\u1ee9c. M\u1ed9t qu\u1ea3n l\u00fd qu\u1ea3n l\u00fd nhi\u1ec1u nh\u00e2n vi\u00ean, v\u00e0 m\u1ed9t nh\u00e2n vi\u00ean \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd b\u1edfi m\u1ed9t qu\u1ea3n l\u00fd. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy ti\u00eau chu\u1ea9n. Vi\u1ec7c c\u1ed1 g\u1eafng l\u00e0m ph\u1eb3ng \u0111i\u1ec1u n\u00e0y th\u00e0nh m\u1ed9t b\u1ea3ng duy nh\u1ea5t c\u00f3 th\u1ec3 khi\u1ebfn vi\u1ec7c b\u00e1o c\u00e1o v\u1ec1 c\u1ea5u tr\u00fac \u0111\u1ed9i nh\u00f3m tr\u1edf n\u00ean b\u1ea5t kh\u1ea3 thi.<\/p>\n

                        \n
                      • B\u1ea3ng \u0111\u1ec7 quy:<\/strong>R\u1ea5t h\u1eefu \u00edch cho danh m\u1ee5c, b\u00ecnh lu\u1eadn v\u00e0 c\u1ea5u tr\u00fac t\u1ed5 ch\u1ee9c.<\/li>\n
                      • Danh s\u00e1ch k\u1ec1:<\/strong>M\u1ed9t m\u1eabu ph\u1ed5 bi\u1ebfn \u0111\u1ec3 l\u01b0u tr\u1eef c\u1ea5u tr\u00fac c\u00e2y.<\/li>\n
                      • \u0110\u00e1nh s\u1ed1 \u0111\u01b0\u1eddng \u0111i:<\/strong>L\u01b0u tr\u1eef to\u00e0n b\u1ed9 \u0111\u01b0\u1eddng \u0111i \u0111\u1ec3 duy\u1ec7t nhanh h\u01a1n trong c\u00e1c t\u00ecnh hu\u1ed1ng \u0111\u1ecdc c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n

                        \u0110\u1eebng s\u1ee3 s\u1ef1 ph\u1ee9c t\u1ea1p n\u1ebfu m\u00f4 h\u00ecnh d\u1eef li\u1ec7u y\u00eau c\u1ea7u \u0111i\u1ec1u \u0111\u00f3. H\u00e3y t\u1eadp trung v\u00e0o vi\u1ec7c \u0111\u1ea3m b\u1ea3o r\u1eb1ng s\u1ef1 ph\u1ee9c t\u1ea1p \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a r\u00f5 r\u00e0ng v\u00e0 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi c\u00e1c ch\u1ec9 m\u1ee5c ph\u00f9 h\u1ee3p.<\/p>\n

                        12. C\u00e1c View thay th\u1ebf nhu c\u1ea7u v\u1ec1 B\u1ea3ng \ud83d\udcca<\/h2>\n

                        M\u1ed9t s\u1ed1 ng\u01b0\u1eddi tin r\u1eb1ng vi\u1ec7c t\u1ea1o ra m\u1ed9t view cho m\u1ed7i truy v\u1ea5n ph\u1ee9c t\u1ea1p s\u1ebd lo\u1ea1i b\u1ecf nhu c\u1ea7u v\u1ec1 m\u1ed9t c\u1ea5u tr\u00fac b\u1ea3ng c\u01a1 s\u1edf \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t. C\u00e1c view l\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c suy ra, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/p>\n

                        M\u1eb7c d\u00f9 c\u00e1c view r\u1ea5t t\u1ed1t cho b\u1ea3o m\u1eadt v\u00e0 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a, nh\u01b0ng ch\u00fang kh\u00f4ng th\u1ec3 thay th\u1ebf cho vi\u1ec7c chu\u1ea9n h\u00f3a c\u01a1 b\u1ea3n c\u1ee7a c\u00e1c b\u1ea3ng c\u01a1 s\u1edf.<\/p>\n

                          \n
                        • L\u01b0u tr\u1eef:<\/strong>C\u00e1c view kh\u00f4ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u; ch\u00fang truy v\u1ea5n d\u1eef li\u1ec7u.<\/li>\n
                        • Hi\u1ec7u su\u1ea5t:<\/strong>C\u00e1c view ph\u1ee9c t\u1ea1p c\u00f3 th\u1ec3 ch\u1eadm n\u1ebfu c\u00e1c b\u1ea3ng c\u01a1 s\u1edf kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/li>\n
                        • B\u1ea3o tr\u00ec:<\/strong>D\u1ef1a v\u00e0o c\u00e1c view cho logic kinh doanh s\u1ebd che gi\u1ea5u c\u00e1c ph\u1ee5 thu\u1ed9c d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

                          S\u1eed d\u1ee5ng c\u00e1c view \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n h\u00f3a truy c\u1eadp, nh\u01b0ng h\u00e3y \u0111\u1ea3m b\u1ea3o c\u00e1c b\u1ea3ng c\u01a1 s\u1edf l\u00e0 v\u1eefng ch\u1eafc v\u00e0 \u0111\u00e3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a.<\/p>\n

                          Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3 \ud83d\udca1<\/h2>\n

                          Tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y \u0111\u00f2i h\u1ecfi kinh nghi\u1ec7m v\u00e0 k\u1ef7 lu\u1eadt. Kh\u00f4ng c\u00f3 c\u00f4ng th\u1ee9c ph\u00e9p m\u00e0u n\u00e0o, nh\u01b0ng c\u00f3 nh\u1eefng nguy\u00ean t\u1eafc \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u1ec3 d\u1eabn d\u1eaft thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3. H\u00e3y t\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, nh\u1ea5t qu\u00e1n v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u kinh doanh.<\/p>\n

                          Khi b\u1ea1n g\u1eb7p m\u1ed9t y\u00eau c\u1ea7u m\u1edbi, h\u00e3y d\u1eebng l\u1ea1i v\u00e0 \u0111\u00e1nh gi\u00e1 xem n\u00f3 \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ebfn m\u00f4 h\u00ecnh hi\u1ec7n c\u00f3. N\u00f3 c\u00f3 t\u1ea1o ra s\u1ef1 tr\u00f9ng l\u1eb7p kh\u00f4ng? N\u00f3 c\u00f3 l\u00e0m ph\u1ee9c t\u1ea1p h\u00f3a c\u00e1c truy v\u1ea5n kh\u00f4ng? Li\u1ec7u n\u00f3 c\u00f3 th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft cho t\u00ednh to\u00e0n v\u1eb9n kh\u00f4ng?<\/p>\n

                          B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c nguy\u00ean t\u1eafc h\u1ee3p l\u00fd v\u00e0 tr\u00e1nh nh\u1eefng hi\u1ec3u l\u1ea7m \u0111\u01b0\u1ee3c n\u00eau \u1edf tr\u00ean, c\u00e1c k\u1ef9 s\u01b0 tr\u1ebb c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i th\u00e0nh nh\u1eefng ki\u1ebfn tr\u00fac s\u01b0 d\u1eef li\u1ec7u t\u1ef1 tin. C\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. H\u00e3y \u0111\u1ed1i x\u1eed v\u1edbi n\u00f3 b\u1eb1ng s\u1ef1 t\u00f4n tr\u1ecdng x\u1ee9ng \u0111\u00e1ng.<\/p>\n

                          H\u00e3y nh\u1edb ghi ch\u00e9p l\u1ea1i c\u00e1c quy\u1ebft \u0111\u1ecbnh c\u1ee7a b\u1ea1n. N\u1ebfu b\u1ea1n ch\u1ecdn m\u1ed9t m\u1eabu thi\u1ebft k\u1ebf c\u1ee5 th\u1ec3, h\u00e3y gi\u1ea3i th\u00edch l\u00fd do. B\u1ed1i c\u1ea3nh n\u00e0y v\u00f4 c\u00f9ng qu\u00fd gi\u00e1 cho nh\u1eefng ng\u01b0\u1eddi b\u1ea3o tr\u00ec trong t\u01b0\u01a1ng lai. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a t\u1ed1t l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t v\u0103n h\u00f3a k\u1ef9 thu\u1eadt tr\u01b0\u1edfng th\u00e0nh.<\/p>\n

                          V\u1eabn ti\u1ebfp t\u1ee5c h\u1ecdc h\u1ecfi t\u1eeb d\u1eef li\u1ec7u s\u1ea3n xu\u1ea5t. Gi\u00e1m s\u00e1t hi\u1ec7u su\u1ea5t truy v\u1ea5n v\u00e0 \u0111i\u1ec1u ch\u1ec9nh l\u01b0\u1ee3c \u0111\u1ed3 khi c\u1ea7n thi\u1ebft. Thi\u1ebft k\u1ebf t\u1ed1t nh\u1ea5t l\u00e0 thi\u1ebft k\u1ebf c\u00f3 th\u1ec3 th\u00edch nghi v\u1edbi th\u1ef1c t\u1ebf c\u00e1ch d\u1eef li\u1ec7u th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                          Thi\u1ebft k\u1ebf m\u1ed9t m\u00f4 h\u00ecnh d\u1eef li\u1ec7u v\u1eefng ch\u1eafc l\u00e0 m\u1ed9t trong nh\u1eefng k\u1ef9 n\u0103ng quan tr\u1ecdng nh\u1ea5t \u0111\u1ed1i v\u1edbi k\u1ef9 s\u01b0 backend ho\u1eb7c ki\u1ebfn tr\u00fac vi\u00ean d\u1eef li\u1ec7u. \u1ede…<\/p>\n","protected":false},"author":1,"featured_media":1660,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn v\u1ec1 ERD: B\u00f3c t\u00e1ch nh\u1eefng hi\u1ec3u l\u1ea7m d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi \ud83d\udee0\ufe0f","_yoast_wpseo_metadesc":"\u0110ang g\u1eb7p kh\u00f3 kh\u0103n v\u1edbi m\u00f4 h\u00ecnh h\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u? 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