{"id":188996,"date":"2024-11-12T03:39:31","date_gmt":"2024-11-11T19:39:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188996\/"},"modified":"2024-11-12T03:39:33","modified_gmt":"2024-11-11T19:39:33","slug":"%e6%8f%90%e9%ab%98sql%e5%9f%b7%e8%a1%8c%e6%95%88%e7%8e%87%e7%9a%84%e5%b9%be%e9%bb%9e%e5%bb%ba%e8%ad%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188996\/","title":{"rendered":"\u63d0\u9ad8SQL\u57f7\u884c\u6548\u7387\u7684\u5e7e\u9ede\u5efa\u8b70"},"content":{"rendered":"<h1 id=\"%e6%8f%90%e9%ab%98sql%e5%9f%b7%e8%a1%8c%e6%95%88%e7%8e%87%e7%9a%84%e5%b9%be%e9%bb%9e%e5%bb%ba%e8%ad%b0-XkTbmuNVcy\">\u63d0\u9ad8SQL\u57f7\u884c\u6548\u7387\u7684\u5e7e\u9ede\u5efa\u8b70<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u7684\u4e3b\u8981\u5de5\u5177\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u61c9\u7528\u9084\u662f\u5927\u578b\u4f01\u696d\u7cfb\u7d71\uff0cSQL\u7684\u57f7\u884c\u6548\u7387\u90fd\u76f4\u63a5\u5f71\u97ff\u5230\u6574\u9ad4\u7cfb\u7d71\u7684\u6027\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u500b\u63d0\u9ad8SQL\u57f7\u884c\u6548\u7387\u7684\u5efa\u8b70\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u512a\u5316\u4ed6\u5011\u7684\u67e5\u8a62\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-XkTbmuNVcy\">1. \u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u5728\u8868\u7684\u7279\u5b9a\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u7d22\u5f15\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n<pre><code>CREATE INDEX idx_column_name ON table_name (column_name);\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u7684\u63d2\u5165\u548c\u66f4\u65b0\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u8b39\u614e\u9078\u64c7\u7d22\u5f15\u3002<\/p>\n<h2 id=\"2-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-XkTbmuNVcy\">2. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u64b0\u5beb\u9ad8\u6548\u7684SQL\u67e5\u8a62\u8a9e\u53e5\u662f\u63d0\u9ad8\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\u3002<\/li>\n<li>\u4f7f\u7528JOIN\u800c\u4e0d\u662f\u5b50\u67e5\u8a62\uff0c\u56e0\u70baJOIN\u901a\u5e38\u66f4\u9ad8\u6548\u3002<\/li>\n<li>\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u4ee5\u9032\u884c\u512a\u5316\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE department_id = 5;\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u6539\u70ba\uff1a<\/p>\n<pre><code>SELECT employee_id, name FROM employees WHERE department_id = 5;\n<\/code><\/pre>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-XkTbmuNVcy\">3. \u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u4e0d\u50c5\u53ef\u4ee5\u7bc0\u7701\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u4f7f\u7528INT\u800c\u4e0d\u662fVARCHAR\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h2 id=\"4-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-XkTbmuNVcy\">4. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u91cd\u5efa\u7d22\u5f15\u548c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u904b\u884c\u5728\u6700\u4f73\u72c0\u614b\u3002\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u7684\u5206\u4f48\u60c5\u6cc1\uff0c\u5f9e\u800c\u512a\u5316\u67e5\u8a62\u8a08\u5283\u3002<\/p>\n<pre><code>-- \u91cd\u5efa\u7d22\u5f15\nALTER INDEX ALL ON table_name REBUILD;\n\n-- \u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\nUPDATE STATISTICS table_name;\n<\/code><\/pre>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e6%9f%a5%e8%a9%a2%e5%88%86%e6%9e%90%e5%b7%a5%e5%85%b7-XkTbmuNVcy\">5. \u4f7f\u7528\u67e5\u8a62\u5206\u6790\u5de5\u5177<\/h2>\n<p>\u8a31\u591a\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u63d0\u4f9b\u67e5\u8a62\u5206\u6790\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u8b58\u5225\u6027\u80fd\u74f6\u9838\u3002\u901a\u904e\u9019\u4e9b\u5de5\u5177\uff0c\u53ef\u4ee5\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u627e\u51fa\u54ea\u4e9b\u90e8\u5206\u9700\u8981\u512a\u5316\u3002<\/p>\n<h2 id=\"6-%e8%80%83%e6%85%ae%e5%88%86%e5%8d%80%e8%a1%a8-XkTbmuNVcy\">6. \u8003\u616e\u5206\u5340\u8868<\/h2>\n<p>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u8003\u616e\u4f7f\u7528\u5206\u5340\u8868\u3002\u5206\u5340\u53ef\u4ee5\u5c07\u6578\u64da\u5206\u6210\u66f4\u5c0f\u7684\u90e8\u5206\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u9019\u6a23\uff0c\u67e5\u8a62\u53ea\u9700\u6383\u63cf\u76f8\u95dc\u7684\u5206\u5340\uff0c\u800c\u4e0d\u662f\u6574\u500b\u8868\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XkTbmuNVcy\">\u7e3d\u7d50<\/h2>\n<p>\u63d0\u9ad8SQL\u57f7\u884c\u6548\u7387\u662f\u4e00\u500b\u591a\u65b9\u9762\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u5230\u7d22\u5f15\u7684\u4f7f\u7528\u3001\u67e5\u8a62\u8a9e\u53e5\u7684\u512a\u5316\u3001\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u3001\u5b9a\u671f\u7684\u6578\u64da\u5eab\u7dad\u8b77\u4ee5\u53ca\u4f7f\u7528\u67e5\u8a62\u5206\u6790\u5de5\u5177\u7b49\u3002\u901a\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u7cfb\u7d71\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u66f4\u597d\u5730\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u904b\u884c\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u63d0\u9ad8SQL\u57f7\u884c\u6548\u7387\u7684\u5e7e\u9ede\u5efa\u8b70\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u57f7\u884c\u6642\u9593\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-188996","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188996","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=188996"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188996\/revisions"}],"predecessor-version":[{"id":188997,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188996\/revisions\/188997"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}