{"id":50076,"date":"2023-02-19T15:01:31","date_gmt":"2023-02-19T08:01:31","guid":{"rendered":"https:\/\/jobsgo.vn\/blog\/?p=50076"},"modified":"2024-12-27T10:49:28","modified_gmt":"2024-12-27T03:49:28","slug":"khoa-chinh-la-gi","status":"publish","type":"post","link":"https:\/\/jobsgo.vn\/blog\/khoa-chinh-la-gi\/","title":{"rendered":"Kh\u00f3a ch\u00ednh l\u00e0 g\u00ec? Kh\u00e1c bi\u1ec7t gi\u1eefa kh\u00f3a ch\u00ednh v\u00e0 kh\u00f3a ngo\u1ea1i trong SQL"},"content":{"rendered":"\n
Kh\u00f3a ch\u00ednh l\u00e0 thu\u1eadt ng\u1eef ph\u1ed5 bi\u1ebfn trong l\u0129nh v\u1ef1c tin h\u1ecdc v\u0103n ph\u00f2ng – kh\u00eda c\u1ea1nh v\u00f4 c\u00f9ng quan tr\u1ecdng v\u1edbi ng\u01b0\u1eddi \u0111i l\u00e0m hi\u1ec7n nay. V\u1eady n\u00ean, b\u1ea1n c\u1ea7n n\u1eafm r\u00f5 v\u1ec1 kh\u00f3a ch\u00ednh \u0111\u1ec3 c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 cho c\u00f4ng vi\u1ec7c c\u1ee7a m\u00ecnh m\u1ed9t c\u00e1ch t\u1ed1t nh\u1ea5t. Trong b\u00e0i vi\u1ebft n\u00e0y, JobsGO s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i \u0111\u00e1p \u201c<\/em>Kh\u00f3a ch\u00ednh l\u00e0 g\u00ec<\/em><\/strong><\/a>?\u201d c\u0169ng nh\u01b0 nh\u1eefng th\u00f4ng tin xoay quanh kh\u00f3a ch\u00ednh \u0111\u1ec3 gi\u00fap b\u1ea1n \u201cn\u1eb1m l\u00f2ng\u201d v\u1ec1 n\u00f3 nh\u00e9!<\/em><\/p>\n M\u1ee5c l\u1ee5c<\/p> Kh\u00f3a ch\u00ednh l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 c\u1ef1c k\u1ef3 quen thu\u1ed9c trong c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL. V\u1eady kh\u00f3a ch\u00ednh l\u00e0 g\u00ec<\/strong><\/a>?<\/p>\n Kh\u00f3a ch\u00ednh<\/strong> hay kh\u00f3a r\u00e0ng bu\u1ed9c c\u00f2n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u00ean g\u1ecdi ti\u1ebfng Anh l\u00e0 Primary Key. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh danh m\u1ed7i m\u1ed9t record trong b\u1ea3ng table. B\u00ean c\u1ea1nh \u0111\u00f3, kh\u00f3a ch\u00ednh c\u00f2n gi\u00fap th\u1ec3 hi\u1ec7n s\u1ef1 t\u01b0\u01a1ng quan gi\u1eefa c\u00e1c b\u1ea3ng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL v\u1edbi nhau. Ngo\u00e0i ra, khi t\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng ngh\u1ec7 th\u00f4ng tin, nhi\u1ec1u ng\u01b0\u1eddi s\u1ebd th\u1eafc m\u1eafc “CIO l\u00e0 g\u00ec<\/a><\/strong>“, th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 v\u1ecb tr\u00ed Gi\u00e1m \u0111\u1ed1c C\u00f4ng ngh\u1ec7 Th\u00f4ng tin trong m\u1ed9t t\u1ed5 ch\u1ee9c.<\/p><\/blockquote>\n Kh\u00f3a ch\u00ednh<\/strong> \u0111\u00f3ng vai tr\u00f2 c\u1ef1c k\u1ef3 quan tr\u1ecdng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/strong><\/a> SQL Server, th\u1ef1c hi\u1ec7n nh\u1eefng ch\u1ee9c n\u0103ng nh\u01b0 sau:<\/p>\n Trong h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m, vi\u1ec7c qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 g\u1eafn li\u1ec1n v\u1edbi c\u00e2u h\u1ecfi “c\u00f4ng vi\u1ec7c c\u1ee7a DevOps l\u00e0 g\u00ec<\/a><\/strong>?”, khi m\u00e0 DevOps c\u1ea7n \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n C\u00f3 th\u1ec3 th\u1ea5y, kh\u00f3a ch\u00ednh<\/strong> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn trong l\u0129nh v\u1ef1c tin h\u1ecdc, c\u1ee5 th\u1ec3 l\u00e0 tin h\u1ecdc v\u0103n ph\u00f2ng. Nh\u1edd c\u00f3 Primary Key m\u00e0 ng\u01b0\u1eddi d\u00f9ng s\u1ebd d\u1ec5 d\u00e0ng h\u01a1n trong vi\u1ec7c x\u1eed l\u00fd c\u00e1c gi\u00e1 tr\u1ecb trong c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL.<\/p>\n Tuy nhi\u00ean, \u0111\u1ec3 th\u00e0nh th\u1ea1o s\u1eed d\u1ee5ng kh\u00f3a ch\u00ednh l\u1ea1i l\u00e0 c\u1ea3 m\u1ed9t qu\u00e1 tr\u00ecnh. B\u1ea1n c\u1ea7n c\u00f3 th\u1eddi gian l\u00e0m quen, h\u1ecdc h\u1ecfi \u0111\u1ec3 c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng linh ho\u1ea1t kh\u00f3a ch\u00ednh nh\u1eb1m ph\u1ee5c v\u1ee5 cho c\u00f4ng vi\u1ec7c v\u00e0 cu\u1ed9c s\u1ed1ng c\u1ee7a b\u1ea1n.<\/p>\n Xem th\u00eam: Big data l\u00e0 g\u00ec<\/a>? T\u1ed5ng h\u1ee3p nh\u1eefng th\u00f4ng tin c\u1ea7n thi\u1ebft cho b\u1ea1n<\/strong><\/p>\n V\u1edbi nh\u1eefng b\u1ea1n m\u1edbi c\u00f3 mong mu\u1ed1n t\u00ecm hi\u1ec3u v\u1ec1 kh\u00f3a ch\u00ednh th\u00ec c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1ch thi\u1ebft l\u1eadp kh\u00f3a ch\u00ednh d\u1ec5 d\u00e0ng, nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3 qua n\u1ed9i dung sau \u0111\u00e2y:<\/p>\n1. Kh\u00f3a ch\u00ednh l\u00e0 g\u00ec?<\/strong><\/span><\/h2>\n
2. C\u00e1c ch\u1ee9c n\u0103ng c\u1ee7a kh\u00f3a ch\u00ednh<\/strong><\/span><\/h2>\n
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3. Kh\u00f3a ch\u00ednh \u00e1p d\u1ee5ng trong ph\u1ea1m vi n\u00e0o?<\/strong><\/span><\/h2>\n
4. H\u01b0\u1edbng d\u1eabn c\u00e1ch thi\u1ebft l\u1eadp kh\u00f3a ch\u00ednh cho ng\u01b0\u1eddi m\u1edbi<\/strong><\/span><\/h2>\n
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