{"id":3374,"date":"2016-07-22T08:22:19","date_gmt":"2016-07-22T08:22:19","guid":{"rendered":"https:\/\/kiencang.net\/?p=3374"},"modified":"2016-07-22T08:22:19","modified_gmt":"2016-07-22T08:22:19","slug":"cau-lenh-dieu-kien-trong-sql","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/","title":{"rendered":"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL"},"content":{"rendered":"\n<p>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n <code>WHERE<\/code> d\u00f9ng \u0111\u1ec3 l\u1ecdc c\u00e1c b\u1ea3n ghi.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6b96e802\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6b96e802\"  type=\"checkbox\" id=\"item-6577d6b96e802\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/#Cau_lenh_dieu_kien_WHERE_trong_SQL\" title=\"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL\">C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/#Co_so_du_lieu_Demo\" title=\"C\u01a1 s\u1edf d\u1eef li\u1ec7u Demo\">C\u01a1 s\u1edf d\u1eef li\u1ec7u Demo<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/#Vi_du_ve_cau_lenh_dieu_kien_WHERE\" title=\"V\u00ed d\u1ee5 v\u1ec1 c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE\">V\u00ed d\u1ee5 v\u1ec1 c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/#Truong_van_ban_va_truong_so\" title=\"Tr\u01b0\u1eddng v\u0103n b\u1ea3n v\u00e0 tr\u01b0\u1eddng s\u1ed1\">Tr\u01b0\u1eddng v\u0103n b\u1ea3n v\u00e0 tr\u01b0\u1eddng s\u1ed1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/#Cac_toan_tu_trong_cau_lenh_dieu_kien_WHERE\" title=\"C\u00e1c to\u00e1n t\u1eed trong c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE\">C\u00e1c to\u00e1n t\u1eed trong c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_lenh_dieu_kien_WHERE_trong_SQL\"><\/span>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n <code>WHERE<\/code> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ecdc ra ch\u1ec9 c\u00e1c b\u1ea3n ghi tho\u1ea3 m\u00e3n \u0111\u1ea7y \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n ch\u1ec9 \u0111\u1ecbnh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">C\u00fa ph\u00e1p c\u00e2u l\u1ec7nh <code>WHERE<\/code> trong SQL:<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT ten_cot,ten_cot\nFROM ten_bang\nWHERE ten_cot toan_tu gia_tri;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Co_so_du_lieu_Demo\"><\/span>C\u01a1 s\u1edf d\u1eef li\u1ec7u Demo<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong kho\u00e1 n\u00e0y, ch\u00fang ta s\u1ebd s\u1eed d\u1ee5ng c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u1eabu \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi bi\u1ebft \u0111\u1ebfn l\u00e0 Northwind.<\/p>\n\n\n\n<p>B\u00ean d\u01b0\u1edbi l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn t\u1eeb b\u1ea3ng &#8220;Customers&#8221;:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>CustomerID<\/th><th>CustomerName<\/th><th>ContactName<\/th><th>Address<\/th><th>City<\/th><th>PostalCode<\/th><th>Country<\/th><\/tr><tr><td>1<\/td><td>Alfreds Futterkiste<\/td><td>Maria Anders<\/td><td>Obere Str. 57<\/td><td>Berlin<\/td><td>12209<\/td><td>Germany<\/td><\/tr><tr><td>2<\/td><td>Ana Trujillo Emparedados y helados<\/td><td>Ana Trujillo<\/td><td>Avda. de la Constituci\u00f3n 2222<\/td><td>M\u00e9xico D.F.<\/td><td>05021<\/td><td>Mexico<\/td><\/tr><tr><td>3<\/td><td>Antonio Moreno Taquer\u00eda<\/td><td>Antonio Moreno<\/td><td>Mataderos 2312<\/td><td>M\u00e9xico D.F.<\/td><td>05023<\/td><td>Mexico<\/td><\/tr><tr><td>4<\/td><td>Around the Horn<\/td><td>Thomas Hardy<\/td><td>120 Hanover Sq.<\/td><td>London<\/td><td>WA1 1DP<\/td><td>UK<\/td><\/tr><tr><td>5<\/td><td>Berglunds snabbk\u00f6p<\/td><td>Christina Berglund<\/td><td>Berguvsv\u00e4gen 8<\/td><td>Lule\u00e5<\/td><td>S-958 22<\/td><td>Sweden<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Vi_du_ve_cau_lenh_dieu_kien_WHERE\"><\/span>V\u00ed d\u1ee5 v\u1ec1 c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e2u l\u1ec7nh SQL b\u00ean d\u01b0\u1edbi l\u1ef1a ch\u1ecdn t\u1ea5t c\u1ea3 kh\u00e1ch h\u00e0ng \u0111\u1ebfn t\u1eeb qu\u1ed1c gia &#8220;Mexico&#8221;, trong b\u1ea3ng &#8220;Customers&#8221;:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ed d\u1ee5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT * FROM Customers\n WHERE Country='Mexico';<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3 (d\u1ef1a v\u00e0o m\u1eabu 5 b\u1ea3n ghi \u1edf tr\u00ean):<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>CustomerID<\/th><th>CustomerName<\/th><th>ContactName<\/th><th>Address<\/th><th>City<\/th><th>PostalCode<\/th><th>Country<\/th><\/tr><tr><td>2<\/td><td>Ana Trujillo Emparedados y helados<\/td><td>Ana Trujillo<\/td><td>Avda. de la Constituci\u00f3n 2222<\/td><td>M\u00e9xico D.F.<\/td><td>05021<\/td><td>Mexico<\/td><\/tr><tr><td>3<\/td><td>Antonio Moreno Taquer\u00eda<\/td><td>Antonio Moreno<\/td><td>Mataderos 2312<\/td><td>M\u00e9xico D.F.<\/td><td>05023<\/td><td>Mexico<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Truong_van_ban_va_truong_so\"><\/span>Tr\u01b0\u1eddng v\u0103n b\u1ea3n v\u00e0 tr\u01b0\u1eddng s\u1ed1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>SQL y\u00eau c\u1ea7u d\u1ea5u nh\u00e1y \u0111\u01a1n quanh v\u0103n b\u1ea3n (h\u1ea7u h\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1ebd y\u00eau c\u1ea7u d\u1ea5u nh\u00e1y k\u00e9p c\u01a1).<\/p>\n\n\n\n<p>D\u00f9 sao, tr\u01b0\u1eddng s\u1ed1 kh\u00f4ng c\u1ea7n ph\u1ea3i \u0111\u01b0a v\u00e0o trong d\u1ea5u nh\u00e1y:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ed d\u1ee5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT * FROM Customers\n WHERE CustomerID=1;<\/code><\/pre>\n\n\n\n<p>K\u1ebft qu\u1ea3:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>CustomerID<\/th><th>CustomerName<\/th><th>ContactName<\/th><th>Address<\/th><th>City<\/th><th>PostalCode<\/th><th>Country<\/th><\/tr><tr><td>1<\/td><td>Alfreds Futterkiste<\/td><td>Maria Anders<\/td><td>Obere Str. 57<\/td><td>Berlin<\/td><td>12209<\/td><td>Germany<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cac_toan_tu_trong_cau_lenh_dieu_kien_WHERE\"><\/span>C\u00e1c to\u00e1n t\u1eed trong c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1c to\u00e1n t\u1eed d\u01b0\u1edbi \u0111\u00e2y c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng trong c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n <code>WHERE<\/code>:<\/p>\n\n\n\n<figure class=\"wp-block-table w3-table-all notranslate\"><table><tbody><tr><th>To\u00e1n t\u1eed<\/th><th>M\u00f4 t\u1ea3<\/th><\/tr><tr><td><code>=<\/code><\/td><td>B\u1eb1ng<\/td><\/tr><tr><td><code>&lt;><\/code><\/td><td>Kh\u00f4ng b\u1eb1ng. L\u01b0u \u00fd: Trong m\u1ed9t s\u1ed1 phi\u00ean b\u1ea3n SQL, to\u00e1n t\u1eed n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft nh\u01b0 sau !=<\/td><\/tr><tr><td><code>><\/code><\/td><td>L\u1edbn h\u01a1n<\/td><\/tr><tr><td><code>&lt;<\/code><\/td><td>Nh\u1ecf h\u01a1n<\/td><\/tr><tr><td><code>>=<\/code><\/td><td>L\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng<\/td><\/tr><tr><td><code>&lt;=<\/code><\/td><td>Nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng<\/td><\/tr><tr><td><code>BETWEEN<\/code><\/td><td>N\u1eb1m gi\u1eefa m\u1ed9t kho\u1ea3ng<\/td><\/tr><tr><td><code>LIKE<\/code><\/td><td>T\u00ecn ki\u1ebfm m\u1ed9t m\u1eabu<\/td><\/tr><tr><td><code>IN<\/code><\/td><td>\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh nhi\u1ec1u gi\u00e1 tr\u1ecb c\u00f3 th\u1ec3 cho m\u1ed9t c\u1ed9t<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE d\u00f9ng \u0111\u1ec3 l\u1ecdc c\u00e1c b\u1ea3n ghi. C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ecdc ra ch\u1ec9 c\u00e1c b\u1ea3n ghi tho\u1ea3 m\u00e3n \u0111\u1ea7y \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n ch\u1ec9 \u0111\u1ecbnh. C\u00fa ph\u00e1p c\u00e2u l\u1ec7nh WHERE trong SQL: C\u01a1 s\u1edf d\u1eef li\u1ec7u Demo Trong kho\u00e1 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/cau-lenh-dieu-kien-trong-sql\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE d\u00f9ng \u0111\u1ec3 l\u1ecdc c\u00e1c b\u1ea3n ghi. C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE trong SQL C\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n WHERE \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ecdc ra ch\u1ec9 c\u00e1c b\u1ea3n ghi tho\u1ea3 m\u00e3n \u0111\u1ea7y \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n ch\u1ec9 \u0111\u1ecbnh. 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