{"id":185292,"date":"2024-11-10T20:20:16","date_gmt":"2024-11-10T12:20:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185292\/"},"modified":"2024-11-10T20:20:17","modified_gmt":"2024-11-10T12:20:17","slug":"%e4%bd%bf%e7%94%a8sql%e8%a7%a3%e6%b1%ba%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e5%95%8f%e9%a1%8c%ef%bc%88sql%e4%bd%bf%e7%94%a8%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185292\/","title":{"rendered":"\u4f7f\u7528SQL\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u554f\u984c\uff08sql\u4f7f\u7528\u52d5\u614b\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8sql%e8%a7%a3%e6%b1%ba%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e5%95%8f%e9%a1%8c-ZSerEBQiNi\">\u4f7f\u7528SQL\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u554f\u984c<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u52d5\u614b\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u64cd\u4f5c\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f5c\u70ba\u4e00\u7a2e\u6a19\u6e96\u7684\u6578\u64da\u5eab\u67e5\u8a62\u8a9e\u8a00\uff0c\u80fd\u5920\u6709\u6548\u5730\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u4e2d\u7684\u5404\u7a2e\u554f\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u4f86\u8655\u7406\u52d5\u614b\u6578\u64da\u5eab\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-ZSerEBQiNi\">\u4ec0\u9ebc\u662f\u52d5\u614b\u6578\u64da\u5eab\uff1f<\/h2>\n<p>\u52d5\u614b\u6578\u64da\u5eab\u662f\u6307\u90a3\u4e9b\u80fd\u5920\u6839\u64da\u7528\u6236\u9700\u6c42\u6216\u61c9\u7528\u7a0b\u5e8f\u7684\u8981\u6c42\uff0c\u96a8\u6642\u66f4\u65b0\u548c\u6539\u8b8a\u5176\u7d50\u69cb\u548c\u5167\u5bb9\u7684\u6578\u64da\u5eab\u3002\u9019\u985e\u6578\u64da\u5eab\u901a\u5e38\u7528\u65bc\u9700\u8981\u5373\u6642\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u5982\u96fb\u5b50\u5546\u52d9\u7db2\u7ad9\u3001\u793e\u4ea4\u5a92\u9ad4\u5e73\u53f0\u548c\u5373\u6642\u901a\u8a0a\u61c9\u7528\u7b49\u3002<\/p>\n<h2 id=\"sql%e5%9c%a8%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%87%89%e7%94%a8-ZSerEBQiNi\">SQL\u5728\u52d5\u614b\u6578\u64da\u5eab\u4e2d\u7684\u61c9\u7528<\/h2>\n<p>SQL\u5728\u52d5\u614b\u6578\u64da\u5eab\u4e2d\u4e3b\u8981\u7528\u65bc\u6578\u64da\u7684\u67e5\u8a62\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684SQL\u64cd\u4f5c\uff0c\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5e6b\u52a9\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u4e2d\u7684\u554f\u984c\uff1a<\/p>\n<h3 id=\"1-%e6%95%b8%e6%93%9a%e6%9f%a5%e8%a9%a2-ZSerEBQiNi\">1. \u6578\u64da\u67e5\u8a62<\/h3>\n<p>\u4f7f\u7528SQL\u67e5\u8a62\u6578\u64da\u662f\u52d5\u614b\u6578\u64da\u5eab\u7684\u57fa\u672c\u64cd\u4f5c\u4e4b\u4e00\u3002\u901a\u904e\u4f7f\u7528SELECT\u8a9e\u53e5\uff0c\u53ef\u4ee5\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6aa2\u7d22\u6240\u9700\u7684\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE status = 'active';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u72c0\u614b\u70ba\u201cactive\u201d\u7684\u7528\u6236\u4fe1\u606f\uff0c\u9019\u5728\u52d5\u614b\u6578\u64da\u5eab\u4e2d\u975e\u5e38\u5e38\u898b\u3002<\/p>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e6%8f%92%e5%85%a5-ZSerEBQiNi\">2. \u6578\u64da\u63d2\u5165<\/h3>\n<p>\u5728\u52d5\u614b\u6578\u64da\u5eab\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u63d2\u5165\u65b0\u6578\u64da\u3002\u4f7f\u7528INSERT\u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u5730\u5c07\u65b0\u8a18\u9304\u6dfb\u52a0\u5230\u6578\u64da\u5eab\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>INSERT INTO orders (user_id, product_id, quantity) VALUES (1, 101, 2);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u4e00\u500b\u65b0\u7684\u8a02\u55ae\u8a18\u9304\u63d2\u5165\u5230orders\u8868\u4e2d\u3002<\/p>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e6%9b%b4%e6%96%b0-ZSerEBQiNi\">3. \u6578\u64da\u66f4\u65b0<\/h3>\n<p>\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0c\u6578\u64da\u53ef\u80fd\u9700\u8981\u66f4\u65b0\u3002\u4f7f\u7528UPDATE\u8a9e\u53e5\u53ef\u4ee5\u4fee\u6539\u73fe\u6709\u8a18\u9304\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>UPDATE users SET last_login = NOW() WHERE user_id = 1;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u7528\u6236ID\u70ba1\u7684\u7528\u6236\u7684\u6700\u5f8c\u767b\u9304\u6642\u9593\u66f4\u65b0\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n<h3 id=\"4-%e6%95%b8%e6%93%9a%e5%88%aa%e9%99%a4-ZSerEBQiNi\">4. \u6578\u64da\u522a\u9664<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\u3002\u4f7f\u7528DELETE\u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u5730\u522a\u9664\u8a18\u9304\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DELETE FROM sessions WHERE last_activity &lt; NOW() - INTERVAL 30 DAY;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u670930\u5929\u524d\u672a\u6d3b\u52d5\u7684\u6703\u8a71\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e5%8b%95%e6%85%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e6%8c%91%e6%88%b0-ZSerEBQiNi\">\u52d5\u614b\u6578\u64da\u5eab\u7684\u6311\u6230<\/h2>\n<p>\u5118\u7ba1SQL\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\u4f86\u7ba1\u7406\u52d5\u614b\u6578\u64da\u5eab\uff0c\u4f46\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u4ecd\u7136\u9762\u81e8\u4e00\u4e9b\u6311\u6230\u3002\u4f8b\u5982\uff0c\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u67e5\u8a62\u6027\u80fd\u53ef\u80fd\u6703\u4e0b\u964d\u3002\u6b64\u5916\uff0c\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u4e5f\u662f\u9700\u8981\u8003\u616e\u7684\u91cd\u8981\u56e0\u7d20\u3002<\/p>\n<h3 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-ZSerEBQiNi\">\u89e3\u6c7a\u65b9\u6848<\/h3>\n<p>\u70ba\u4e86\u89e3\u6c7a\u9019\u4e9b\u6311\u6230\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li>\u5b9a\u671f\u9032\u884c\u6578\u64da\u6e05\u7406\uff0c\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6574\u6f54\u3002<\/li>\n<li>\u5be6\u65bd\u4e8b\u52d9\u7ba1\u7406\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ZSerEBQiNi\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528SQL\u4f86\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u554f\u984c\u662f\u4e00\u500b\u6709\u6548\u7684\u65b9\u6cd5\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u7684SQL\u64cd\u4f5c\uff0c\u5982\u67e5\u8a62\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u52d5\u614b\u6578\u64da\u5eab\u3002\u96a8\u8457\u6280\u8853\u7684\u9032\u6b65\uff0c\u52d5\u614b\u6578\u64da\u5eab\u7684\u7ba1\u7406\u5c07\u8b8a\u5f97\u66f4\u52a0\u9ad8\u6548\u548c\u53ef\u9760\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u5eab\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u4f7f\u7528SQL\u6709\u6548\u89e3\u6c7a\u52d5\u614b\u6578\u64da\u5eab\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u5be6\u73fe\u9748\u6d3b\u6578\u64da\u64cd\u4f5c\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-185292","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185292","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=185292"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185292\/revisions"}],"predecessor-version":[{"id":185293,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185292\/revisions\/185293"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}