{"id":1619,"date":"2026-03-24T11:58:28","date_gmt":"2026-03-24T11:58:28","guid":{"rendered":"https:\/\/www.viz-read.com\/vi\/erd-scalable-systems-design-growth\/"},"modified":"2026-03-24T11:58:28","modified_gmt":"2026-03-24T11:58:28","slug":"erd-scalable-systems-design-growth","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/vi\/erd-scalable-systems-design-growth\/","title":{"rendered":"ERD cho c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng: Thi\u1ebft k\u1ebf v\u00ec s\u1ef1 ph\u00e1t tri\u1ec3n ngay t\u1eeb ng\u00e0y \u0111\u1ea7u ti\u00ean"},"content":{"rendered":"

X\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 x\u1eed l\u00fd h\u00e0ng tri\u1ec7u ng\u01b0\u1eddi d\u00f9ng \u0111\u00f2i h\u1ecfi nhi\u1ec1u h\u01a1n ch\u1ec9 l\u00e0 ph\u1ea7n c\u1ee9ng m\u1ea1nh m\u1ebd hay m\u00e3 ngu\u1ed3n hi\u1ec7u qu\u1ea3. N\u1ec1n t\u1ea3ng n\u1eb1m ngay \u1edf c\u1ea5u tr\u00fac d\u1eef li\u1ec7u b\u1ea3n th\u00e2n. M\u1ed9t s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u t\u00e0i li\u1ec7u; n\u00f3 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho s\u1ef1 b\u1ec1n v\u1eefng c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n. Khi c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 thi\u1ebft k\u1ebf \u0111\u1ec3 ph\u00e1t tri\u1ec3n, h\u1ecd d\u1ef1 \u0111o\u00e1n t\u1ea3i tr\u1ecdng t\u01b0\u01a1ng lai, \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7 v\u00e0 nhu c\u1ea7u v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. M\u1ed9t l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng c\u1ea9n th\u1eadn s\u1ebd ng\u0103n ch\u1eb7n n\u1ee3 k\u1ef9 thu\u1eadt t\u00edch t\u1ee5 ngay c\u1ea3 tr\u01b0\u1edbc khi l\u1ea7n commit \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1ch ti\u1ebfp c\u1eadn thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 \u0111\u1eb7c bi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. Ch\u00fang ta s\u1ebd \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c n\u1ec1n t\u1ea3ng l\u00fd thuy\u1ebft, c\u00e1c th\u1ecfa hi\u1ec7p th\u1ef1c ti\u1ec5n v\u00e0 c\u00e1c m\u1eabu c\u1ea5u tr\u00fac h\u1ed7 tr\u1ee3 c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 l\u01b0u l\u01b0\u1ee3ng cao m\u00e0 kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh nh\u1ea5t qu\u00e1n.<\/p>\n

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

\ud83e\udde9 Gi\u1ea3i ph\u1eabu c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t ERD c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng<\/h2>\n

Tr\u01b0\u1edbc khi xem x\u00e9t kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng, ta ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n. M\u1ed7i s\u01a1 \u0111\u1ed3 bao g\u1ed3m c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. Trong b\u1ed1i c\u1ea3nh m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c, c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c \u0111\u1ec3 tr\u00e1nh c\u00e1c \u0111i\u1ec3m ngh\u1ebdn v\u1ec1 sau.<\/p>\n

    \n
  • Th\u1ef1c th\u1ec3:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ed1t l\u00f5i trong l\u0129nh v\u1ef1c kinh doanh c\u1ee7a b\u1ea1n. C\u00e1c v\u00ed d\u1ee5 bao g\u1ed3m Ng\u01b0\u1eddi d\u00f9ng, \u0110\u01a1n h\u00e0ng v\u00e0 S\u1ea3n ph\u1ea9m. Trong c\u00e1c h\u1ec7 th\u1ed1ng t\u0103ng tr\u01b0\u1edfng m\u1ea1nh, c\u00e1c th\u1ef1c th\u1ec3 c\u1ea7n \u0111\u1ee7 chi ti\u1ebft \u0111\u1ec3 cho ph\u00e9p m\u1edf r\u1ed9ng \u0111\u1ed9c l\u1eadp nh\u01b0ng v\u1eabn \u0111\u1ee7 g\u1eafn k\u1ebft \u0111\u1ec3 duy tr\u00ec c\u00e1c ranh gi\u1edbi logic.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 c\u00e1c th\u1ef1c th\u1ec3. Ki\u1ec3u d\u1eef li\u1ec7u \u1edf \u0111\u00e2y r\u1ea5t quan tr\u1ecdng. Vi\u1ec7c ch\u1ecdn ki\u1ec3u d\u1eef li\u1ec7u \u0111\u00fang s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u qu\u1ea3 l\u01b0u tr\u1eef v\u00e0 hi\u1ec7u su\u1ea5t truy v\u1ea5n. V\u00ed d\u1ee5, s\u1eed d\u1ee5ng ki\u1ec3u s\u1ed1 nguy\u00ean chuy\u00ean d\u1ee5ng cho ID s\u1ebd t\u1ed1t h\u01a1n so v\u1edbi chu\u1ed7i khi th\u1ef1c hi\u1ec7n truy v\u1ea5n ch\u1ec9 m\u1ee5c.<\/li>\n
  • M\u1ed1i quan h\u1ec7:<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. T\u00ednh cardinality l\u00e0 kh\u00eda c\u1ea1nh quan tr\u1ecdng nh\u1ea5t c\u1ea7n x\u00e1c \u0111\u1ecbnh t\u1eeb \u0111\u1ea7u. Vi\u1ec7c hi\u1ec3u nh\u1ea7m m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111a th\u00e0nh \u0111a-\u0111a c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c thao t\u00e1c n\u1ed1i kh\u00f4ng c\u1ea7n thi\u1ebft v\u00e0 l\u00e0m suy gi\u1ea3m nghi\u00eam tr\u1ecdng hi\u1ec7u su\u1ea5t.<\/li>\n<\/ul>\n

    \ud83d\udcd0 Hi\u1ec3u r\u00f5 v\u1ec1 Cardinality v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c<\/h2>\n

    Cardinality x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 ho\u1eb7c ph\u1ea3i li\u00ean k\u1ebft v\u1edbi c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. Trong c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng, vi\u1ec7c l\u1ef1a ch\u1ecdn cardinality th\u01b0\u1eddng quy\u1ebft \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n m\u1ea3nh.<\/p>\n

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    • M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> Hi\u1ebfm khi \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t. Th\u01b0\u1eddng ng\u1ee5 \u00fd vi\u1ec7c chia nh\u1ecf m\u1ed9t th\u1ef1c th\u1ec3 l\u1edbn \u0111\u1ec3 gi\u1ea3m thi\u1ec3u xung \u0111\u1ed9t kh\u00f3a. Ch\u1ec9 n\u00ean d\u00f9ng khi c\u00e1c m\u1eabu truy c\u1eadp d\u1eef li\u1ec7u ho\u00e0n to\u00e0n kh\u00e1c bi\u1ec7t.<\/li>\n
    • M\u1ed9t-\u0111a (1:N):<\/strong> M\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t. M\u1ed9t Ng\u01b0\u1eddi d\u00f9ng c\u00f3 nhi\u1ec1u \u0110\u01a1n h\u00e0ng. C\u1ea5u tr\u00fac n\u00e0y h\u1ed7 tr\u1ee3 ch\u1ec9 m\u1ee5c hi\u1ec7u qu\u1ea3 \u1edf ph\u00eda kh\u00f3a ngo\u1ea1i, cho ph\u00e9p truy xu\u1ea5t nhanh c\u00e1c b\u1ea3n ghi li\u00ean quan.<\/li>\n
    • \u0110a-\u0111a (M:N):<\/strong> Y\u00eau c\u1ea7u b\u1ea3ng li\u00ean k\u1ebft. D\u00f9 linh ho\u1ea1t, nh\u01b0ng ch\u00fang c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn hi\u1ec7u su\u1ea5t khi kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng l\u00ean. H\u00e3y c\u00e2n nh\u1eafc vi\u1ec7c lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c view \u0111\u00e3 v\u1eadt ch\u1ea5t h\u00f3a n\u1ebfu t\u1ea7n su\u1ea5t \u0111\u1ecdc cao.<\/li>\n<\/ul>\n

      Khi x\u00e1c \u0111\u1ecbnh c\u00e1c r\u00e0ng bu\u1ed9c, h\u00e3y c\u00e2n nh\u1eafc chi ph\u00ed th\u1ef1c thi. Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, vi\u1ec7c th\u1ef1c thi c\u00e1c r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i nghi\u00eam ng\u1eb7t qua c\u00e1c m\u1ea3nh d\u1eef li\u1ec7u c\u00f3 th\u1ec3 g\u00e2y ra \u0111\u1ed9 tr\u1ec5. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p nh\u01b0 v\u1eady, ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec l\u01b0u l\u01b0\u1ee3ng h\u1ec7 th\u1ed1ng \u0111\u1ed3ng th\u1eddi b\u1ea3o to\u00e0n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n

      \u2696\ufe0f Th\u1ecfa hi\u1ec7p gi\u1eefa chu\u1ea9n h\u00f3a v\u00e0 hi\u1ec7u su\u1ea5t<\/h2>\n

      Chu\u1ea9n h\u00f3a gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Tuy nhi\u00ean, c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao th\u01b0\u1eddng y\u00eau c\u1ea7u s\u1ef1 thay \u0111\u1ed5i so v\u1edbi c\u00e1c quy t\u1eafc chu\u1ea9n h\u00f3a nghi\u00eam ng\u1eb7t. Hi\u1ec3u r\u00f5 c\u00e1c t\u1ea7ng gi\u00fap \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh s\u00e1ng su\u1ed1t h\u01a1n.<\/p>\n

        \n
      • D\u1ea1ng chu\u1ea9n th\u1ee9 nh\u1ea5t (1NF):<\/strong>Gi\u00e1 tr\u1ecb nguy\u00ean t\u1eed. \u0110\u1ea3m b\u1ea3o m\u1ed7i \u00f4 ch\u1ec9 ch\u1ee9a m\u1ed9t gi\u00e1 tr\u1ecb duy nh\u1ea5t. \u0110\u00e2y l\u00e0 \u0111i\u1ec1u kh\u00f4ng th\u1ec3 th\u01b0\u01a1ng l\u01b0\u1ee3ng \u0111\u1ec3 duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n quan h\u1ec7.<\/li>\n
      • D\u1ea1ng chu\u1ea9n th\u1ee9 hai (2NF):<\/strong>Kh\u00f4ng c\u00f3 ph\u1ee5 thu\u1ed9c t\u1eebng ph\u1ea7n. 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. H\u1eefu \u00edch \u0111\u1ec3 gi\u1ea3m c\u00e1c b\u1ea5t th\u01b0\u1eddng khi c\u1eadp nh\u1eadt.<\/li>\n
      • D\u1ea1ng chu\u1ea9n th\u1ee9 ba (3NF):<\/strong>Kh\u00f4ng c\u00f3 ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u. 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. \u0110\u00e2y l\u00e0 m\u1ee5c ti\u00eau ti\u00eau chu\u1ea9n cho ph\u1ea7n l\u1edbn c\u00e1c h\u1ec7 th\u1ed1ng giao d\u1ecbch.<\/li>\n<\/ul>\n

        M\u1eb7c d\u00f9 3NF l\u00fd t\u01b0\u1edfng cho t\u00ednh nh\u1ea5t qu\u00e1n, nh\u01b0ng th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi c\u00e1c thao t\u00e1c n\u1ed1i ph\u1ee9c t\u1ea1p. Trong c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 nhi\u1ec1u thao t\u00e1c \u0111\u1ecdc, vi\u1ec7c n\u1ed1i nhi\u1ec1u b\u1ea3ng c\u00f3 th\u1ec3 g\u00e2y \u00e1p l\u1ef1c l\u00ean b\u1ed9 x\u1eed l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u. Vi\u1ec7c lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a bao g\u1ed3m vi\u1ec7c nh\u00e2n \u0111\u00f4i d\u1eef li\u1ec7u \u0111\u1ec3 gi\u1ea3m nhu c\u1ea7u n\u1ed1i. \u0110i\u1ec1u n\u00e0y l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p khi ghi nh\u01b0ng l\u1ea1i l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc.<\/p>\n

        \ud83d\udcca So s\u00e1nh gi\u1eefa chu\u1ea9n h\u00f3a v\u00e0 lo\u1ea1i b\u1ecf chu\u1ea9n h\u00f3a<\/h3>\n\n\n\n\n\n\n\n\n\n
        T\u00ednh n\u0103ng<\/th>\nChu\u1ea9n h\u00f3a (3NF)<\/th>\nKh\u00f4ng chu\u1ea9n h\u00f3a<\/th>\n<\/tr>\n<\/thead>\n
        To\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/strong><\/td>\nCao (Ngu\u1ed3n d\u1eef li\u1ec7u duy nh\u1ea5t)<\/td>\nTh\u1ea5p (Y\u00eau c\u1ea7u logic \u0111\u1ed3ng b\u1ed9)<\/td>\n<\/tr>\n
        Hi\u1ec7u su\u1ea5t ghi<\/strong><\/td>\nNhanh h\u01a1n (D\u1eef li\u1ec7u ghi \u00edt h\u01a1n)<\/td>\nCh\u1eadm h\u01a1n (Ghi tr\u00f9ng l\u1eb7p)<\/td>\n<\/tr>\n
        Hi\u1ec7u su\u1ea5t \u0111\u1ecdc<\/strong><\/td>\nCh\u1eadm h\u01a1n (Y\u00eau c\u1ea7u n\u1ed1i b\u1ea3ng)<\/td>\nNhanh h\u01a1n (Truy c\u1eadp tr\u1ef1c ti\u1ebfp)<\/td>\n<\/tr>\n
        S\u1eed d\u1ee5ng dung l\u01b0\u1ee3ng l\u01b0u tr\u1eef<\/strong><\/td>\nHi\u1ec7u qu\u1ea3<\/td>\nCao h\u01a1n (D\u01b0 th\u1eeba)<\/td>\n<\/tr>\n
        Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong><\/td>\nH\u1ec7 th\u1ed1ng giao d\u1ecbch (OLTP)<\/td>\nB\u00e1o c\u00e1o v\u00e0 ph\u00e2n t\u00edch (OLAP)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \ud83d\ude80 Thi\u1ebft k\u1ebf cho kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng ngang<\/h2>\n

        Khi kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng l\u00ean, m\u1ed9t n\u00fat c\u01a1 s\u1edf d\u1eef li\u1ec7u duy nh\u1ea5t tr\u1edf th\u00e0nh \u0111i\u1ec3m ngh\u1ebdn. M\u1edf r\u1ed9ng ngang bao g\u1ed3m vi\u1ec7c th\u00eam nhi\u1ec1u n\u00fat h\u01a1n \u0111\u1ec3 ph\u00e2n t\u00e1n t\u1ea3i. S\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n ph\u1ea3i h\u1ed7 tr\u1ee3 ki\u1ebfn tr\u00fac n\u00e0y ngay t\u1eeb \u0111\u1ea7u.<\/p>\n

          \n
        • Kh\u00f3a ph\u00e2n m\u1ea3nh:<\/strong>X\u00e1c \u0111\u1ecbnh m\u1ed9t c\u1ed9t cho ph\u00e9p d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chia \u0111\u1ec1u tr\u00ean c\u00e1c ph\u00e2n m\u1ea3nh. C\u1ed9t n\u00e0y ph\u1ea3i xu\u1ea5t hi\u1ec7n trong m\u1ecdi truy v\u1ea5n truy c\u1eadp d\u1eef li\u1ec7u. N\u1ebfu m\u1ed9t truy v\u1ea5n y\u00eau c\u1ea7u qu\u00e9t t\u1ea5t c\u1ea3 c\u00e1c ph\u00e2n m\u1ea3nh, hi\u1ec7u su\u1ea5t s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng.<\/li>\n
        • Kh\u00f3a ngo\u1ea1i gi\u1eefa c\u00e1c ph\u00e2n m\u1ea3nh:<\/strong>Vi\u1ec7c n\u1ed1i c\u00e1c b\u1ea3ng n\u1eb1m tr\u00ean c\u00e1c ph\u00e2n m\u1ea3nh kh\u00e1c nhau t\u1ed1n k\u00e9m v\u1ec1 m\u1eb7t t\u00ednh to\u00e1n. T\u1ed1i thi\u1ec3u h\u00f3a c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c ph\u00e2n m\u1ea3nh trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf. N\u1ebfu m\u1ed1i quan h\u1ec7 l\u00e0 c\u1ea7n thi\u1ebft, h\u00e3y c\u00e2n nh\u1eafc vi\u1ec7c l\u01b0u tr\u1eef d\u1eef li\u1ec7u tham chi\u1ebfu trong b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/li>\n
        • ID to\u00e0n c\u1ea7u:<\/strong>S\u1eed d\u1ee5ng c\u00e1c \u0111\u1ecbnh danh duy nh\u1ea5t kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ed9 \u0111\u1ebfm t\u1ef1 t\u0103ng, v\u00ec ch\u00fang c\u00f3 th\u1ec3 g\u00e2y ra xung \u0111\u1ed9t. UUID ho\u1eb7c b\u1ed9 sinh ID ph\u00e2n t\u00e1n \u0111\u01b0\u1ee3c \u01b0u ti\u00ean.<\/li>\n<\/ul>\n

          Khi m\u00f4 h\u00ecnh h\u00f3a cho ph\u00e2n m\u1ea3nh, h\u00e3y xem x\u00e9t s\u1ef1 ph\u00e2n b\u1ed1 d\u1eef li\u1ec7u. C\u00e1c \u0111i\u1ec3m n\u00f3ng x\u1ea3y ra khi m\u1ed9t ph\u00e2n m\u1ea3nh nh\u1eadn \u0111\u01b0\u1ee3c l\u01b0\u1ee3ng truy c\u1eadp \u0111\u00e1ng k\u1ec3 h\u01a1n c\u00e1c ph\u00e2n m\u1ea3nh kh\u00e1c. Ph\u00e2n t\u00edch c\u00e1c m\u1eabu truy c\u1eadp \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f3a ph\u00e2n m\u1ea3nh ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c b\u1ed9 l\u1ecdc truy v\u1ea5n th\u01b0\u1eddng xuy\u00ean nh\u1ea5t.<\/p>\n

          \ud83d\udcd1 Chi\u1ebfn l\u01b0\u1ee3c l\u1eadp ch\u1ec9 m\u1ee5c cho d\u1eef li\u1ec7u l\u1edbn<\/h2>\n

          Ch\u1ec9 m\u1ee5c l\u00e0 thi\u1ebft y\u1ebfu cho hi\u1ec7u su\u1ea5t truy v\u1ea5n, nh\u01b0ng ch\u00fang \u0111i k\u00e8m v\u1edbi chi ph\u00ed. M\u1ed7i ch\u1ec9 m\u1ee5c ti\u00eau t\u1ed1n dung l\u01b0\u1ee3ng l\u01b0u tr\u1eef v\u00e0 l\u00e0m ch\u1eadm c\u00e1c thao t\u00e1c ghi. M\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn chi\u1ebfn l\u01b0\u1ee3c trong vi\u1ec7c l\u1eadp ch\u1ec9 m\u1ee5c l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/p>\n

            \n
          • Ch\u1ec9 m\u1ee5c ch\u1ecdn l\u1ecdc:<\/strong> T\u1ea1o ch\u1ec9 m\u1ee5c tr\u00ean c\u00e1c c\u1ed9t l\u1ecdc d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3. M\u1ed9t c\u1ed9t c\u00f3 t\u00ednh \u0111a d\u1ea1ng th\u1ea5p (v\u00ed d\u1ee5: gi\u1edbi t\u00ednh) th\u01b0\u1eddng kh\u00f4ng ph\u1ea3i l\u00e0 \u1ee9ng c\u1eed vi\u00ean t\u1ed1t cho ch\u1ec9 m\u1ee5c ch\u00ednh.<\/li>\n
          • Ch\u1ec9 m\u1ee5c k\u1ebft h\u1ee3p:<\/strong> K\u1ebft h\u1ee3p nhi\u1ec1u c\u1ed9t theo th\u1ee9 t\u1ef1 ph\u00f9 h\u1ee3p v\u1edbi m\u1eabu truy v\u1ea5n. Quy t\u1eafc ti\u1ec1n t\u1ed1 tr\u00e1i nh\u1ea5t \u00e1p d\u1ee5ng, ngh\u0129a l\u00e0 c\u1ed9t \u0111\u1ea7u ti\u00ean trong ch\u1ec9 m\u1ee5c ph\u1ea3i kh\u1edbp v\u1edbi truy v\u1ea5n \u0111\u1ec3 ch\u1ec9 m\u1ee5c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3.<\/li>\n
          • Ch\u1ec9 m\u1ee5c bao ph\u1ee7:<\/strong> Bao g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c c\u1ed9t c\u1ea7n thi\u1ebft cho m\u1ed9t truy v\u1ea5n trong ch\u00ednh ch\u1ec9 m\u1ee5c. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00e1p \u1ee9ng truy v\u1ea5n m\u00e0 kh\u00f4ng c\u1ea7n truy c\u1eadp d\u1eef li\u1ec7u b\u1ea3ng, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thao t\u00e1c \u201cbao ph\u1ee7\u201d.<\/li>\n
          • Ch\u1ec9 m\u1ee5c ph\u1ea7n:<\/strong> Ch\u1ec9 l\u1eadp ch\u1ec9 m\u1ee5c cho m\u1ed9t ph\u1ea7n c\u00e1c h\u00e0ng trong b\u1ea3ng. \u0110i\u1ec1u n\u00e0y h\u1eefu \u00edch cho x\u00f3a m\u1ec1m ho\u1eb7c c\u00e1c c\u1edd tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3, gi\u00fap gi\u1ea3m k\u00edch th\u01b0\u1edbc c\u1ea5u tr\u00fac ch\u1ec9 m\u1ee5c.<\/li>\n<\/ul>\n

            Xem x\u00e9t c\u00e1c k\u1ebf ho\u1ea1ch th\u1ef1c thi truy v\u1ea5n th\u01b0\u1eddng xuy\u00ean. M\u1ed9t ch\u1ec9 m\u1ee5c tr\u00f4ng t\u1ed1t tr\u00ean gi\u1ea5y c\u00f3 th\u1ec3 b\u1ecb b\u1ed9 t\u1ed1i \u01b0u h\u00f3a truy v\u1ea5n b\u1ecf qua n\u1ebfu th\u1ed1ng k\u00ea \u0111\u00e3 l\u1ed7i th\u1eddi. B\u1ea3o tr\u00ec \u0111\u1ecbnh k\u1ef3 \u0111\u1ea3m b\u1ea3o b\u1ed9 \u0111\u1ed9ng c\u01a1 c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh t\u1ed1i \u01b0u.<\/p>\n

            \ud83d\udd04 Ti\u1ebfn h\u00f3a v\u00e0 di chuy\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3<\/h2>\n

            C\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng t\u0129nh. Y\u00eau c\u1ea7u thay \u0111\u1ed5i, v\u00e0 m\u00f4 h\u00ecnh d\u1eef li\u1ec7u ph\u1ea3i ti\u1ebfn h\u00f3a. Chuy\u1ec3n t\u1eeb phi\u00ean b\u1ea3n A sang phi\u00ean b\u1ea3n B m\u00e0 kh\u00f4ng g\u00e2y gi\u00e1n \u0111o\u1ea1n l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng quan tr\u1ecdng.<\/p>\n

              \n
            • C\u00e1c thay \u0111\u1ed5i b\u1ed5 sung:<\/strong> Vi\u1ec7c th\u00eam c\u1ed9t ho\u1eb7c b\u1ea3ng th\u01b0\u1eddng an to\u00e0n. N\u00f3 kh\u00f4ng l\u00e0m h\u1ecfng c\u00e1c truy v\u1ea5n hi\u1ec7n c\u00f3. \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c \u01b0u ti\u00ean \u0111\u1ec3 gi\u1edbi thi\u1ec7u c\u00e1c t\u00ednh n\u0103ng m\u1edbi.<\/li>\n
            • C\u00e1c thao t\u00e1c \u0111\u1ed5i t\u00ean:<\/strong> \u0110\u1ed5i t\u00ean m\u1ed9t c\u1ed9t l\u00e0 r\u1ee7i ro. N\u00f3 y\u00eau c\u1ea7u c\u1eadp nh\u1eadt m\u00e3 \u1ee9ng d\u1ee5ng. L\u00ean k\u1ebf ho\u1ea1ch cho giai \u0111o\u1ea1n lo\u1ea1i b\u1ecf, trong \u0111\u00f3 c\u1ea3 t\u00ean c\u0169 v\u00e0 t\u00ean m\u1edbi \u0111\u1ec1u \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/li>\n
            • Th\u00eam r\u00e0ng bu\u1ed9c:<\/strong> Th\u00eam r\u00e0ng bu\u1ed9c (v\u00ed d\u1ee5: NOT NULL) v\u00e0o d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i n\u1ebfu d\u1eef li\u1ec7u t\u1ed3n t\u1ea1i. X\u00e1c minh d\u1eef li\u1ec7u tr\u01b0\u1edbc, sau \u0111\u00f3 th\u00eam r\u00e0ng bu\u1ed9c \u1edf b\u01b0\u1edbc ri\u00eang bi\u1ec7t.<\/li>\n
            • T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c phi\u00ean b\u1ea3n l\u01b0\u1ee3c \u0111\u1ed3 m\u1edbi kh\u00f4ng l\u00e0m h\u1ecfng kh\u00e1ch h\u00e0ng hi\u1ec7n c\u00f3. S\u1eed d\u1ee5ng c\u1edd t\u00ednh n\u0103ng \u0111\u1ec3 b\u1eadt t\u1eaft logic m\u1edbi ch\u1ec9 khi l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u00e3 s\u1eb5n s\u00e0ng.<\/li>\n<\/ul>\n

              \ud83d\udeab Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

              Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng g\u1eb7p ph\u1ea3i v\u1ea5n \u0111\u1ec1. Nh\u1eadn di\u1ec7n c\u00e1c m\u1eabu n\u00e0y s\u1edbm c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m th\u1eddi gian ph\u00e1t tri\u1ec3n \u0111\u00e1ng k\u1ec3.<\/p>\n

                \n
              • Li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd:<\/strong> T\u1ea1o c\u00e1c m\u1ed1i quan h\u1ec7 bu\u1ed9c ph\u1ea3i \u0111\u1ed3ng b\u1ed9 h\u00f3a nghi\u00eam ng\u1eb7t gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 kh\u00f4ng li\u00ean quan. Gi\u1eef c\u00e1c module li\u00ean k\u1ebft l\u1ecfng l\u1ebbo \u0111\u1ec3 cho ph\u00e9p tri\u1ec3n khai \u0111\u1ed9c l\u1eadp.<\/li>\n
              • Thi\u1ebft k\u1ebf qu\u00e1 m\u1ee9c:<\/strong> Thi\u1ebft k\u1ebf cho c\u00e1c t\u00ecnh hu\u1ed1ng c\u00f3 th\u1ec3 ch\u01b0a bao gi\u1edd x\u1ea3y ra. T\u1eadp trung v\u00e0o 80% tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1ea1o ra 90% l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp. \u0110\u01a1n gi\u1ea3n h\u00f3a gi\u00fap d\u1ec5 b\u1ea3o tr\u00ec.<\/li>\n
              • B\u1ecf qua x\u00f3a m\u1ec1m:<\/strong> X\u00f3a c\u1ee9ng x\u00f3a d\u1eef li\u1ec7u v\u0129nh vi\u1ec5n. \u0110\u1ec3 theo d\u00f5i nh\u1eadt k\u00fd ho\u1eb7c ph\u1ee5c h\u1ed3i, h\u00e3y s\u1eed d\u1ee5ng c\u1edd tr\u1ea1ng th\u00e1i (v\u00ed d\u1ee5: is_deleted) thay v\u00ec x\u00f3a v\u1eadt l\u00fd.<\/li>\n
              • V\u1ea5n \u0111\u1ec1 truy v\u1ea5n N+1:<\/strong> Kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc c\u00e1ch d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c truy xu\u1ea5t. L\u00ean k\u1ebf ho\u1ea1ch cho vi\u1ec7c t\u1ea3i s\u1edbm ho\u1eb7c truy xu\u1ea5t theo l\u00f4 \u1edf l\u1edbp truy c\u1eadp d\u1eef li\u1ec7u \u0111\u1ec3 tr\u00e1nh c\u00e1c l\u01b0\u1ee3t truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u qu\u00e1 m\u1ee9c.<\/li>\n<\/ul>\n

                \u2705 Danh s\u00e1ch ki\u1ec3m tra thi\u1ebft k\u1ebf tr\u01b0\u1edbc tri\u1ec3n khai<\/h2>\n

                Tr\u01b0\u1edbc khi ho\u00e0n t\u1ea5t l\u01b0\u1ee3c \u0111\u1ed3, h\u00e3y \u0111i qua danh s\u00e1ch x\u00e1c minh n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1eb5n s\u00e0ng cho vi\u1ec7c m\u1edf r\u1ed9ng.<\/p>\n

                  \n
                • \u2610 Kh\u00f3a ch\u00ednh:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c b\u1ea3ng \u0111\u1ec1u \u0111\u01b0\u1ee3c trang b\u1ecb kh\u00f3a ch\u00ednh duy nh\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c ch\u01b0a?<\/li>\n
                • \u2610 Kh\u00f3a ngo\u1ea1i:<\/strong>C\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a ch\u00ednh x\u00e1c kh\u00f4ng? T\u00ednh c\u1ea5p \u0111\u1ed9 c\u00f3 ch\u00ednh x\u00e1c kh\u00f4ng?<\/li>\n
                • \u2610 Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong>C\u00e1c ki\u1ec3u s\u1ed1 li\u1ec7u c\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ID v\u00e0 s\u1ed1 l\u01b0\u1ee3ng kh\u00f4ng? C\u00e1c ki\u1ec3u ng\u00e0y th\u00e1ng c\u00f3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a ch\u01b0a?<\/li>\n
                • \u2610 Kh\u1ea3 n\u0103ng ch\u1ea5p nh\u1eadn gi\u00e1 tr\u1ecb r\u1ed7ng:<\/strong>C\u00e1c tr\u01b0\u1eddng b\u1eaft bu\u1ed9c c\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u l\u00e0 NOT NULL ch\u01b0a?<\/li>\n
                • \u2610 Ch\u1ec9 m\u1ee5c:<\/strong>C\u00e1c c\u1ed9t truy v\u1ea5n c\u00f3 l\u01b0u l\u01b0\u1ee3ng cao \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c ch\u01b0a?<\/li>\n
                • \u2610 Chia nh\u1ecf d\u1eef li\u1ec7u:<\/strong>C\u00f3 kh\u00f3a chia nh\u1ecf kh\u1ea3 thi n\u00e0o kh\u00f4ng n\u1ebfu d\u1ef1 ki\u1ebfn m\u1edf r\u1ed9ng ngang?<\/li>\n
                • \u2610 R\u00e0ng bu\u1ed9c:<\/strong>C\u00e1c r\u00e0ng bu\u1ed9c c\u00f3 c\u1ea7n thi\u1ebft cho logic kinh doanh, hay ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u1edf l\u1edbp \u1ee9ng d\u1ee5ng?<\/li>\n
                • \u2610 T\u00e0i li\u1ec7u:<\/strong>S\u01a1 \u0111\u1ed3 ERD \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 ph\u1ea3n \u00e1nh tri\u1ec3n khai cu\u1ed1i c\u00f9ng ch\u01b0a?<\/li>\n<\/ul>\n

                  \ud83d\udee1\ufe0f B\u1ea3o to\u00e0n to\u00e0n v\u1eb9n d\u1eef li\u1ec7u trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n<\/h2>\n

                  Trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, c\u00e1c thu\u1ed9c t\u00ednh ACID (T\u00ednh nguy\u00ean t\u1eed, T\u00ednh nh\u1ea5t qu\u00e1n, T\u00ednh t\u00e1ch bi\u1ec7t, T\u00ednh b\u1ec1n v\u1eefng) kh\u00f3 \u0111\u1ea3m b\u1ea3o h\u01a1n gi\u1eefa c\u00e1c n\u00fat. Hi\u1ec3u r\u00f5 h\u1ec7 qu\u1ea3 \u0111\u1ed1i v\u1edbi s\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft.<\/p>\n

                    \n
                  • T\u00ednh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng:<\/strong>Ch\u1ea5p nh\u1eadn r\u1eb1ng d\u1eef li\u1ec7u c\u00f3 th\u1ec3 t\u1ea1m th\u1eddi kh\u00f4ng nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c b\u1ea3n sao. Thi\u1ebft k\u1ebf \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n \u0111\u1ec3 x\u1eed l\u00fd tr\u1ea1ng th\u00e1i n\u00e0y m\u1ed9t c\u00e1ch tr\u01a1n tru.<\/li>\n
                  • T\u00ednh idempotent:<\/strong>\u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c thao t\u00e1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1eed l\u1ea1i m\u00e0 kh\u00f4ng g\u00e2y t\u00e1c \u0111\u1ed9ng ph\u1ee5. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c l\u1ed7i m\u1ea1ng, n\u01a1i thao t\u00e1c ghi c\u00f3 th\u1ec3 th\u00e0nh c\u00f4ng nh\u01b0ng x\u00e1c nh\u1eadn b\u1ecb m\u1ea5t.<\/li>\n
                  • Gi\u1ea3i quy\u1ebft xung \u0111\u1ed9t:<\/strong> X\u00e1c \u0111\u1ecbnh c\u00e1ch x\u1eed l\u00fd c\u00e1c c\u1eadp nh\u1eadt \u0111\u1ed3ng th\u1eddi \u0111\u1ed1i v\u1edbi c\u00f9ng m\u1ed9t b\u1ea3n ghi. C\u00e1c m\u1ed1c th\u1eddi gian ho\u1eb7c \u0111\u1ed3ng h\u1ed3 vector c\u00f3 th\u1ec3 gi\u00fap x\u00e1c \u0111\u1ecbnh phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t.<\/li>\n<\/ul>\n

                    B\u1eb1ng c\u00e1ch t\u00edch h\u1ee3p nh\u1eefng c\u00e2n nh\u1eafc n\u00e0y v\u00e0o s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 c\u1ee7a b\u1ea1n, b\u1ea1n s\u1ebd t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t ngay h\u00f4m nay m\u00e0 c\u00f2n \u0111\u1ee7 v\u1eefng ch\u1eafc cho ng\u00e0y mai. Chi ph\u00ed thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3 trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t cao h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi vi\u1ec7c thi\u1ebft k\u1ebf n\u00f3 \u0111\u00fang c\u00e1ch ngay t\u1eeb \u0111\u1ea7u.<\/p>\n

                    \ud83d\udd0d T\u00f3m t\u1eaft c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/h2>\n

                    T\u00f3m l\u1ea1i, vi\u1ec7c m\u1edf r\u1ed9ng th\u00e0nh c\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 k\u1ef7 lu\u1eadt trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u. T\u1eadp trung v\u00e0o c\u00e1c \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng, chu\u1ea9n h\u00f3a ph\u00f9 h\u1ee3p v\u00e0 l\u1eadp ch\u1ec9 m\u1ee5c chi\u1ebfn l\u01b0\u1ee3c. Tr\u00e1nh nh\u1eefng c\u00e1ch l\u00e0m t\u1eaft \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Th\u01b0\u1eddng xuy\u00ean xem x\u00e9t l\u1ea1i s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD t\u0129nh l\u00e0 m\u1ed9t r\u1ee7i ro; m\u1ed9t m\u00f4 h\u00ecnh s\u1ed1ng \u0111\u1ed9ng l\u00e0 m\u1ed9t t\u00e0i s\u1ea3n.<\/p>\n

                    D\u00e0nh th\u1eddi gian cho giai \u0111o\u1ea1n thi\u1ebft k\u1ebf. \u0110i\u1ec1u n\u00e0y s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch l\u1edbn trong vi\u1ec7c gi\u1ea3m chi ph\u00ed b\u1ea3o tr\u00ec v\u00e0 t\u0103ng \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng. Ng\u01b0\u1eddi d\u00f9ng c\u1ee7a b\u1ea1n s\u1ebd kh\u00f4ng bao gi\u1edd th\u1ea5y s\u01a1 \u0111\u1ed3, nh\u01b0ng h\u1ecd s\u1ebd c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e0 s\u01a1 \u0111\u1ed3 \u0111\u00f3 h\u1ed7 tr\u1ee3.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    X\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 x\u1eed l\u00fd h\u00e0ng tri\u1ec7u ng\u01b0\u1eddi d\u00f9ng \u0111\u00f2i h\u1ecfi nhi\u1ec1u h\u01a1n ch\u1ec9 l\u00e0 ph\u1ea7n c\u1ee9ng m\u1ea1nh m\u1ebd hay m\u00e3 ngu\u1ed3n hi\u1ec7u qu\u1ea3. N\u1ec1n t\u1ea3ng…<\/p>\n","protected":false},"author":1,"featured_media":1620,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 cho c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng: Thi\u1ebft k\u1ebf cho s\u1ef1 ph\u00e1t tri\u1ec3n ngay t\u1eeb ng\u00e0y \u0111\u1ea7u ti\u00ean","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 cho c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. Bao g\u1ed3m chu\u1ea9n h\u00f3a, l\u1eadp ch\u1ec9 m\u1ee5c v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ph\u00e1t tri\u1ec3n l\u01b0\u1ee3c \u0111\u1ed3 cho c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n nhanh.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[88],"tags":[84,87],"class_list":["post-1619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 cho c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng: Thi\u1ebft k\u1ebf cho s\u1ef1 ph\u00e1t tri\u1ec3n ngay t\u1eeb ng\u00e0y \u0111\u1ea7u ti\u00ean<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 cho c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng. 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