{"id":142081,"date":"2024-10-31T22:20:21","date_gmt":"2024-10-31T14:20:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/142081\/"},"modified":"2024-10-31T22:20:22","modified_gmt":"2024-10-31T14:20:22","slug":"sql%ef%bc%88%e5%8f%8a%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%ef%bc%89%e8%b7%91%e5%be%97%e5%a4%aa%e6%85%a2%e6%80%8e%e9%ba%bc%e8%be%a6%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/142081\/","title":{"rendered":"SQL\uff08\u53ca\u5b58\u5132\u904e\u7a0b\uff09\u8dd1\u5f97\u592a\u6162\u600e\u9ebc\u8fa6\uff1f"},"content":{"rendered":"<h1 id=\"sql%ef%bc%88%e5%8f%8a%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%ef%bc%89%e8%b7%91%e5%be%97%e5%a4%aa%e6%85%a2%e6%80%8e%e9%ba%bc%e8%be%a6%ef%bc%9f-qYwrMMZmvE\">SQL\uff08\u53ca\u5b58\u5132\u904e\u7a0b\uff09\u8dd1\u5f97\u592a\u6162\u600e\u9ebc\u8fa6\uff1f<\/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\u4e4b\u4e00\u3002\u7136\u800c\uff0c\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\u548c\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u7d93\u5e38\u9762\u81e8SQL\u67e5\u8a62\u548c\u5b58\u5132\u904e\u7a0b\u57f7\u884c\u7de9\u6162\u7684\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u898b\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u512a\u5316SQL\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%b8%80%e3%80%81%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd%e7%9a%84%e5%b8%b8%e8%a6%8b%e5%8e%9f%e5%9b%a0-qYwrMMZmvE\">\u4e00\u3001\u67e5\u8a62\u6027\u80fd\u7684\u5e38\u898b\u539f\u56e0<\/h2>\n<p>\u5728\u6df1\u5165\u89e3\u6c7a\u65b9\u6848\u4e4b\u524d\uff0c\u4e86\u89e3\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\u7684\u539f\u56e0\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>\u7f3a\u4e4f\u7d22\u5f15\uff1a<\/strong>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u5982\u679c\u8868\u4e2d\u7f3a\u5c11\u9069\u7576\u7684\u7d22\u5f15\uff0c\u67e5\u8a62\u5c07\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\uff0c\u9019\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u4e0d\u7576\u7684\u67e5\u8a62\u8a2d\u8a08\uff1a<\/strong>\u8907\u96dc\u7684\u67e5\u8a62\u6216\u4e0d\u5408\u7406\u7684JOIN\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u7279\u5225\u662f\u7576\u6d89\u53ca\u591a\u500b\u8868\u6642\uff0c\u67e5\u8a62\u7684\u8a2d\u8a08\u81f3\u95dc\u91cd\u8981\u3002<\/li>\n<li><strong>\u6578\u64da\u91cf\u904e\u5927\uff1a<\/strong>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u4e5f\u6703\u96a8\u4e4b\u589e\u52a0\u3002\u9019\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u5408\u7406\u7684\u5206\u5340\u6216\u6b78\u6a94\u3002<\/li>\n<li><strong>\u9396\u5b9a\u554f\u984c\uff1a<\/strong>\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u9396\u5b9a\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u7b49\u5f85\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%ba%8c%e3%80%81%e5%84%aa%e5%8c%96sql%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%ad%96%e7%95%a5-qYwrMMZmvE\">\u4e8c\u3001\u512a\u5316SQL\u67e5\u8a62\u7684\u7b56\u7565<\/h2>\n<p>\u91dd\u5c0d\u4e0a\u8ff0\u554f\u984c\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316SQL\u67e5\u8a62\u7684\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-qYwrMMZmvE\">1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u78ba\u4fdd\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u5217\u4e0a\u5275\u5efa\u9069\u7576\u7684\u7d22\u5f15\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_column_name ON table_name (column_name);<\/code><\/pre>\n<p>\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u904e\u591a\u7684\u7d22\u5f15\u4e5f\u6703\u5f71\u97ff\u5beb\u5165\u6027\u80fd\uff0c\u56e0\u6b64\u9700\u8981\u5e73\u8861\u3002<\/p>\n<h3 id=\"2-%e7%b0%a1%e5%8c%96%e6%9f%a5%e8%a9%a2-qYwrMMZmvE\">2. \u7c21\u5316\u67e5\u8a62<\/h3>\n<p>\u5c0d\u65bc\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u8003\u616e\u5c07\u5176\u62c6\u5206\u70ba\u591a\u500b\u7c21\u55ae\u7684\u67e5\u8a62\uff0c\u6216\u4f7f\u7528\u81e8\u6642\u8868\u4f86\u5b58\u5132\u4e2d\u9593\u7d50\u679c\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6bcf\u500b\u67e5\u8a62\u7684\u8ca0\u64d4\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8explain%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-qYwrMMZmvE\">3. \u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528EXPLAIN\u8a9e\u53e5\u4f86\u5206\u6790\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u4e86\u89e3\u67e5\u8a62\u7684\u6027\u80fd\u74f6\u9838\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>EXPLAIN SELECT * FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u9019\u5c07\u986f\u793a\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u60a8\u8b58\u5225\u9700\u8981\u512a\u5316\u7684\u90e8\u5206\u3002<\/p>\n<h3 id=\"4-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-qYwrMMZmvE\">4. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h3>\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\u5e6b\u52a9\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u5be6\u73fe\uff1a<\/p>\n<pre><code>DBCC DBREINDEX ('table_name');<\/code><\/pre>\n<h2 id=\"%e4%b8%89%e3%80%81%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e7%9a%84%e5%84%aa%e5%8c%96-qYwrMMZmvE\">\u4e09\u3001\u5b58\u5132\u904e\u7a0b\u7684\u512a\u5316<\/h2>\n<p>\u5b58\u5132\u904e\u7a0b\u662f\u57f7\u884c\u4e00\u7cfb\u5217SQL\u8a9e\u53e5\u7684\u96c6\u5408\uff0c\u512a\u5316\u5b58\u5132\u904e\u7a0b\u540c\u6a23\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u5b58\u5132\u904e\u7a0b\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u4f7f\u7528SELECT *\uff1a<\/strong>\u660e\u78ba\u6307\u5b9a\u6240\u9700\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002<\/li>\n<li><strong>\u4f7f\u7528SET NOCOUNT ON\uff1a<\/strong>\u9019\u53ef\u4ee5\u9632\u6b62\u5b58\u5132\u904e\u7a0b\u8fd4\u56de\u884c\u6578\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u53c3\u6578\u5316\u67e5\u8a62\uff1a<\/strong>\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u4e26\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qYwrMMZmvE\">\u7e3d\u7d50<\/h2>\n<p>SQL\u67e5\u8a62\u548c\u5b58\u5132\u904e\u7a0b\u7684\u6027\u80fd\u554f\u984c\u662f\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u6311\u6230\u3002\u901a\u904e\u9069\u7576\u7684\u7d22\u5f15\u3001\u7c21\u5316\u67e5\u8a62\u3001\u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u6b64\u5916\uff0c\u512a\u5316\u5b58\u5132\u904e\u7a0b\u7684\u8a2d\u8a08\u4e5f\u80fd\u9032\u4e00\u6b65\u63d0\u5347\u6574\u9ad4\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\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\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u512a\u5316SQL\u67e5\u8a62\u548c\u5b58\u5132\u904e\u7a0b\u6027\u80fd\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6548\u7387\uff0c\u89e3\u6c7a\u57f7\u884c\u7de9\u6162\u7684\u554f\u984c\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-142081","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142081","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=142081"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142081\/revisions"}],"predecessor-version":[{"id":142082,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142081\/revisions\/142082"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=142081"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=142081"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=142081"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}