{"id":185288,"date":"2024-11-10T20:18:17","date_gmt":"2024-11-10T12:18:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185288\/"},"modified":"2024-11-10T20:18:18","modified_gmt":"2024-11-10T12:18:18","slug":"%e4%bd%bf%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e7%94%a8%e6%88%b6%e8%a1%a8%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sql%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%94%a8%e6%88%b6%e8%a1%a8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185288\/","title":{"rendered":"\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\u7684\u65b9\u6cd5\uff08sql\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u7528\u6236\u8868\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e7%94%a8%e6%88%b6%e8%a1%a8%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sql%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%94%a8%e6%88%b6%e8%a1%a8%ef%bc%89-PqdxZQkpWt\">\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\u7684\u65b9\u6cd5\uff08SQL\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u7528\u6236\u8868\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u5eab\u7684\u4e3b\u8981\u5de5\u5177\u4e4b\u4e00\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\u9805\u76ee\uff0c\u4e86\u89e3\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%94%a8%e6%88%b6%e8%a1%a8%ef%bc%9f-PqdxZQkpWt\">\u4ec0\u9ebc\u662f\u7528\u6236\u8868\uff1f<\/h2>\n<p>\u7528\u6236\u8868\u662f\u6578\u64da\u5eab\u4e2d\u7528\u4f86\u5b58\u5132\u7528\u6236\u4fe1\u606f\u7684\u8868\u683c\u3002\u9019\u4e9b\u4fe1\u606f\u901a\u5e38\u5305\u62ec\u7528\u6236\u7684ID\u3001\u59d3\u540d\u3001\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3001\u8a3b\u518a\u65e5\u671f\u7b49\u3002\u7528\u6236\u8868\u7684\u8a2d\u8a08\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6574\u9ad4\u7d50\u69cb\u548c\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84sql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e6%b3%95-PqdxZQkpWt\">\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u6cd5<\/h2>\n<p>\u5728\u67e5\u8a62\u7528\u6236\u8868\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u6cd5\u3002\u6700\u5e38\u898b\u7684\u67e5\u8a62\u8a9e\u53e5\u662fSELECT\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column1, column2, ...<\/code>\u662f\u60a8\u5e0c\u671b\u67e5\u8a62\u7684\u5217\uff0c<code>table_name<\/code>\u662f\u7528\u6236\u8868\u7684\u540d\u7a31\uff0c<code>condition<\/code>\u662f\u904e\u6ffe\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%89%80%e6%9c%89%e7%94%a8%e6%88%b6-PqdxZQkpWt\">\u67e5\u8a62\u6240\u6709\u7528\u6236<\/h2>\n<p>\u5982\u679c\u60a8\u60f3\u67e5\u8a62\u7528\u6236\u8868\u4e2d\u7684\u6240\u6709\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM users;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u7528\u6236\u8868\u4e2d\u6240\u6709\u5217\u7684\u6240\u6709\u884c\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%89%b9%e5%ae%9a%e7%94%a8%e6%88%b6-PqdxZQkpWt\">\u67e5\u8a62\u7279\u5b9a\u7528\u6236<\/h2>\n<p>\u5982\u679c\u60a8\u53ea\u60f3\u67e5\u8a62\u7279\u5b9a\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u4f86\u6307\u5b9a\u689d\u4ef6\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u7528\u6236ID\u70ba1\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE id = 1;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56deID\u70ba1\u7684\u7528\u6236\u7684\u6240\u6709\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%89%b9%e5%ae%9a%e5%88%97-PqdxZQkpWt\">\u67e5\u8a62\u7279\u5b9a\u5217<\/h2>\n<p>\u6709\u6642\u5019\uff0c\u60a8\u53ef\u80fd\u53ea\u9700\u8981\u67e5\u8a62\u7279\u5b9a\u7684\u5217\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u53ea\u60f3\u67e5\u8a62\u7528\u6236\u7684\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT name, email FROM users;<\/code><\/pre>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-PqdxZQkpWt\">\u6392\u5e8f\u67e5\u8a62\u7d50\u679c<\/h2>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528ORDER BY\u5b50\u53e5\u4f86\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u4f8b\u5982\uff0c\u6309\u8a3b\u518a\u65e5\u671f\u964d\u5e8f\u6392\u5217\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY registration_date DESC;<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-PqdxZQkpWt\">\u4f7f\u7528\u805a\u5408\u51fd\u6578<\/h2>\n<p>SQL\u9084\u63d0\u4f9b\u4e86\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u4f8b\u5982COUNT\u3001SUM\u3001AVG\u7b49\u3002\u5047\u8a2d\u60a8\u60f3\u8a08\u7b97\u7528\u6236\u7684\u7e3d\u6578\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT COUNT(*) FROM users;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e5%90%88%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-PqdxZQkpWt\">\u7d50\u5408\u591a\u500b\u689d\u4ef6\u67e5\u8a62<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6839\u64da\u591a\u500b\u689d\u4ef6\u4f86\u67e5\u8a62\u7528\u6236\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u8a3b\u518a\u65e5\u671f\u57282023\u5e74\u4ee5\u5f8c\u7684\u6240\u6709\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE registration_date &gt; '2023-01-01';<\/code><\/pre>\n<h2 id=\"%e5%b0%8f%e7%b5%90-PqdxZQkpWt\">\u5c0f\u7d50<\/h2>\n<p>\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\u662f\u4e00\u9805\u57fa\u672c\u4f46\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u6cd5\u548c\u6280\u5de7\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u6240\u6709\u7528\u6236\u3001\u7279\u5b9a\u7528\u6236\u9084\u662f\u9032\u884c\u66f4\u8907\u96dc\u7684\u67e5\u8a62\uff0cSQL\u90fd\u80fd\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\u3002\u900f\u904e\u7a69\u5b9a\u7684\u4f3a\u670d\u5668\u548c\u9748\u6d3b\u7684\u914d\u7f6e\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u7ba1\u7406\u548c\u67e5\u8a62\u60a8\u7684\u7528\u6236\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u7528\u6236\u8868\uff0c\u638c\u63e1\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u7528\u6236\u4fe1\u606f\u7684\u6709\u6548\u65b9\u6cd5\u548c\u6280\u5de7\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-185288","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185288","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=185288"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185288\/revisions"}],"predecessor-version":[{"id":185289,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185288\/revisions\/185289"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}