{"id":197699,"date":"2024-11-14T09:58:54","date_gmt":"2024-11-14T01:58:54","guid":{"rendered":"https:\/\/server.hk\/cnblog\/197699\/"},"modified":"2024-11-14T09:58:55","modified_gmt":"2024-11-14T01:58:55","slug":"%e5%88%a9%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%e5%bf%ab%e9%80%9f%e5%ae%9a%e4%bd%8d%e8%a1%a8%e6%a0%bc%e4%bf%a1%e6%81%af-sql%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%9f%a5%e8%a9%a2%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/197699\/","title":{"rendered":"\u5229\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u5feb\u901f\u5b9a\u4f4d\u8868\u683c\u4fe1\u606f (sql\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u8868)"},"content":{"rendered":"<h1 id=\"%e5%88%a9%e7%94%a8sql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%e5%bf%ab%e9%80%9f%e5%ae%9a%e4%bd%8d%e8%a1%a8%e6%a0%bc%e4%bf%a1%e6%81%af-TmSgEyzjJE\">\u5229\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u5feb\u901f\u5b9a\u4f4d\u8868\u683c\u4fe1\u606f<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u6210\u70ba\u4e86\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u5927\u578b\u4f01\u696d\u9084\u662f\u5c0f\u578b\u521d\u5275\u516c\u53f8\uff0cSQL\u90fd\u80fd\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u5b9a\u4f4d\u548c\u6aa2\u7d22\u6240\u9700\u7684\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5229\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u5feb\u901f\u5b9a\u4f4d\u8868\u683c\u4fe1\u606f\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n<h2 id=\"sql%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%b5%90%e6%a7%8b-TmSgEyzjJE\">SQL\u67e5\u8a62\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb<\/h2>\n<p>SQL\u67e5\u8a62\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u90e8\u5206\uff1a<\/p>\n<ul>\n<li><strong>SELECT<\/strong>\uff1a\u6307\u5b9a\u8981\u6aa2\u7d22\u7684\u5217\u3002<\/li>\n<li><strong>FROM<\/strong>\uff1a\u6307\u5b9a\u8981\u67e5\u8a62\u7684\u8868\u683c\u3002<\/li>\n<li><strong>WHERE<\/strong>\uff1a\u7528\u65bc\u904e\u6ffe\u7d50\u679c\uff0c\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6aa2\u7d22\u6578\u64da\u3002<\/li>\n<li><strong>ORDER BY<\/strong>\uff1a\u7528\u65bc\u5c0d\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002<\/li>\n<li><strong>LIMIT<\/strong>\uff1a\u9650\u5236\u8fd4\u56de\u7684\u8a18\u9304\u6578\u91cf\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT name, age FROM users WHERE age &gt; 18 ORDER BY age DESC LIMIT 10;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u9078\u64c7\u6240\u6709\u5e74\u9f61\u5927\u65bc18\u6b72\u7684\u7528\u6236\uff0c\u4e26\u6309\u5e74\u9f61\u964d\u5e8f\u6392\u5217\uff0c\u6700\u591a\u8fd4\u56de10\u689d\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e5%bf%ab%e9%80%9f%e5%ae%9a%e4%bd%8d%e8%a1%a8%e6%a0%bc%e4%bf%a1%e6%81%af%e7%9a%84%e6%8a%80%e5%b7%a7-TmSgEyzjJE\">\u5feb\u901f\u5b9a\u4f4d\u8868\u683c\u4fe1\u606f\u7684\u6280\u5de7<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8where%e5%ad%90%e5%8f%a5%e9%81%8e%e6%bf%be%e6%95%b8%e6%93%9a-TmSgEyzjJE\">1. \u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u6578\u64da<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528WHERE\u5b50\u53e5\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u5b9a\u4f4d\u7279\u5b9a\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u627e\u540d\u70ba\u201cJohn\u201d\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE name = 'John';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u540d\u70ba\u201cJohn\u201d\u7684\u7528\u6236\u7684\u5b8c\u6574\u4fe1\u606f\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8like%e9%80%b2%e8%a1%8c%e6%a8%a1%e7%b3%8a%e6%9f%a5%e8%a9%a2-TmSgEyzjJE\">2. \u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u7528\u6236\u4e0d\u78ba\u5b9a\u5b8c\u6574\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u67e5\u627e\u6240\u6709\u4ee5\u201cJ\u201d\u958b\u982d\u7684\u7528\u6236\u540d\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE name LIKE 'J%';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u4ee5\u201cJ\u201d\u958b\u982d\u7684\u7528\u6236\u540d\u3002<\/p>\n<h3 id=\"3-%e7%b5%90%e5%90%88%e5%a4%9a%e5%80%8b%e6%a2%9d%e4%bb%b6-TmSgEyzjJE\">3. \u7d50\u5408\u591a\u500b\u689d\u4ef6<\/h3>\n<p>\u7528\u6236\u53ef\u4ee5\u4f7f\u7528AND\u548cOR\u904b\u7b97\u7b26\u7d50\u5408\u591a\u500b\u689d\u4ef6\u4f86\u9032\u884c\u66f4\u7cbe\u78ba\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u67e5\u627e\u5e74\u9f61\u572818\u523025\u6b72\u4e4b\u9593\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt;= 18 AND age &lt;= 25;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u572818\u523025\u6b72\u4e4b\u9593\u7684\u7528\u6236\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8join%e6%9f%a5%e8%a9%a2%e5%a4%9a%e5%80%8b%e8%a1%a8%e6%a0%bc-TmSgEyzjJE\">4. \u4f7f\u7528JOIN\u67e5\u8a62\u591a\u500b\u8868\u683c<\/h3>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6578\u64da\u901a\u5e38\u5206\u4f48\u5728\u591a\u500b\u8868\u683c\u4e2d\u3002\u4f7f\u7528JOIN\u8a9e\u53e5\u53ef\u4ee5\u5c07\u9019\u4e9b\u8868\u683c\u4e2d\u7684\u6578\u64da\u7d50\u5408\u8d77\u4f86\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u201corders\u201d\u8868\u548c\u4e00\u500b\u201cusers\u201d\u8868\uff0c\u6211\u5011\u53ef\u4ee5\u67e5\u8a62\u6bcf\u500b\u7528\u6236\u7684\u8a02\u55ae\u4fe1\u606f\uff1a<\/p>\n<pre><code>SELECT users.name, orders.order_id FROM users JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6bcf\u500b\u7528\u6236\u53ca\u5176\u5c0d\u61c9\u7684\u8a02\u55aeID\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TmSgEyzjJE\">\u7e3d\u7d50<\/h2>\n<p>\u5229\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u5feb\u901f\u5b9a\u4f4d\u8868\u683c\u4fe1\u606f\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9ad8\u6548\u5730\u6aa2\u7d22\u548c\u7ba1\u7406\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528WHERE\u5b50\u53e5\u3001LIKE\u904b\u7b97\u7b26\u3001\u7d50\u5408\u591a\u500b\u689d\u4ef6\u4ee5\u53caJOIN\u64cd\u4f5c\uff0c\u7528\u6236\u53ef\u4ee5\u9748\u6d3b\u5730\u67e5\u8a62\u6240\u9700\u7684\u4fe1\u606f\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u548c\u670d\u52d9\u5668\u74b0\u5883\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\uff0c\u4e26\u70ba\u696d\u52d9\u6c7a\u7b56\u63d0\u4f9b\u652f\u6301\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5feb\u901f\u5b78\u7fd2\u5982\u4f55\u5229\u7528SQL\u67e5\u8a62\u8a9e\u53e5\u9ad8\u6548\u5b9a\u4f4d\u6578\u64da\u5eab\u4e2d\u7684\u8868\u683c\u4fe1\u606f\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\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-197699","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/197699","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=197699"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/197699\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=197699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=197699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=197699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}