{"id":143751,"date":"2024-11-01T00:56:37","date_gmt":"2024-10-31T16:56:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143751\/"},"modified":"2024-11-01T00:56:38","modified_gmt":"2024-10-31T16:56:38","slug":"sql-%e6%9f%a5%e8%a9%a2%e8%bf%94%e5%9b%9e%e7%b5%90%e6%9e%9c%e9%99%90%e5%88%b6%e7%82%ba%e9%a6%96%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%88sql-%e5%8f%aa%e8%bf%94%e5%9b%9e%e4%b9%8b%e4%b8%80%e8%a1%8c%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143751\/","title":{"rendered":"SQL \u67e5\u8a62\u8fd4\u56de\u7d50\u679c\u9650\u5236\u70ba\u9996\u884c\u6578\u64da\uff08sql \u53ea\u8fd4\u56de\u4e4b\u4e00\u884c\u6578\u64da\u5eab\uff09"},"content":{"rendered":"<h1 id=\"sql-%e6%9f%a5%e8%a9%a2%e8%bf%94%e5%9b%9e%e7%b5%90%e6%9e%9c%e9%99%90%e5%88%b6%e7%82%ba%e9%a6%96%e8%a1%8c%e6%95%b8%e6%93%9a-loNYVouzsu\">SQL \u67e5\u8a62\u8fd4\u56de\u7d50\u679c\u9650\u5236\u70ba\u9996\u884c\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u7684\u5f37\u5927\u5de5\u5177\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u7279\u5b9a\u4fe1\u606f\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528 SQL \u67e5\u8a62\u8a9e\u53e5\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u9700\u8981\u67e5\u8a62\u7d50\u679c\u7684\u7b2c\u4e00\u884c\u6578\u64da\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 SQL \u67e5\u8a62\u4e2d\u9650\u5236\u8fd4\u56de\u7d50\u679c\u70ba\u9996\u884c\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-loNYVouzsu\">\u70ba\u4ec0\u9ebc\u9700\u8981\u9650\u5236\u67e5\u8a62\u7d50\u679c<\/h2>\n<p>\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u67e5\u8a62\u53ef\u80fd\u6703\u8fd4\u56de\u5927\u91cf\u7684\u6578\u64da\u884c\u3002\u9019\u4e0d\u50c5\u6703\u6d88\u8017\u66f4\u591a\u7684\u8cc7\u6e90\uff0c\u9084\u53ef\u80fd\u4f7f\u5f97\u6578\u64da\u7684\u8655\u7406\u8b8a\u5f97\u66f4\u52a0\u8907\u96dc\u3002\u9650\u5236\u67e5\u8a62\u7d50\u679c\u70ba\u9996\u884c\u6578\u64da\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u7684\u8ca0\u64d4\uff0c\u4e26\u4e14\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u66f4\u5feb\u5730\u7372\u5f97\u6240\u9700\u7684\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%b8%8d%e5%90%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b3%bb%e7%b5%b1%e7%9a%84%e5%af%a6%e7%8f%be%e6%96%b9%e5%bc%8f-loNYVouzsu\">\u4e0d\u540c\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u5be6\u73fe\u65b9\u5f0f<\/h2>\n<p>\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5c0d\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u8a9e\u6cd5\u6709\u6240\u4e0d\u540c\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ca\u5176\u76f8\u61c9\u7684\u67e5\u8a62\u8a9e\u6cd5\uff1a<\/p>\n<h3 id=\"1-mysql-loNYVouzsu\">1. MySQL<\/h3>\n<p>\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LIMIT<\/code> \u5b50\u53e5\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u5f9e\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\u4e2d\u7372\u53d6\u7b2c\u4e00\u884c\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users LIMIT 1;<\/code><\/pre>\n<h3 id=\"2-sql-server-loNYVouzsu\">2. SQL Server<\/h3>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>TOP<\/code> \u95dc\u9375\u5b57\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002\u4ee5\u4e0b\u662f\u76f8\u61c9\u7684\u67e5\u8a62\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT TOP 1 * FROM users;<\/code><\/pre>\n<h3 id=\"3-postgresql-loNYVouzsu\">3. PostgreSQL<\/h3>\n<p>PostgreSQL \u4e5f\u652f\u6301 <code>LIMIT<\/code> \u5b50\u53e5\uff0c\u8207 MySQL \u7684\u7528\u6cd5\u76f8\u4f3c\uff1a<\/p>\n<pre><code>SELECT * FROM users LIMIT 1;<\/code><\/pre>\n<h3 id=\"4-oracle-loNYVouzsu\">4. Oracle<\/h3>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ROWNUM<\/code> \u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE ROWNUM = 1;<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-loNYVouzsu\">\u4f7f\u7528\u5834\u666f<\/h2>\n<p>\u9650\u5236\u67e5\u8a62\u7d50\u679c\u70ba\u9996\u884c\u6578\u64da\u7684\u4f7f\u7528\u5834\u666f\u975e\u5e38\u5ee3\u6cdb\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u7576\u9700\u8981\u7372\u53d6\u6700\u65b0\u7684\u7528\u6236\u4fe1\u606f\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6392\u5e8f\u548c\u9650\u5236\u4f86\u7372\u53d6\u7b2c\u4e00\u884c\u6578\u64da\u3002<\/li>\n<li>\u5728\u9032\u884c\u7d71\u8a08\u5206\u6790\u6642\uff0c\u53ef\u80fd\u53ea\u9700\u8981\u7372\u53d6\u67d0\u500b\u6307\u6a19\u7684\u9996\u500b\u503c\u3002<\/li>\n<li>\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u6e2c\u8a66\u67e5\u8a62\u7684\u6b63\u78ba\u6027\u6642\uff0c\u9650\u5236\u8fd4\u56de\u884c\u6578\u53ef\u4ee5\u5e6b\u52a9\u5feb\u901f\u6aa2\u67e5\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-loNYVouzsu\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u8a9e\u6cd5\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u67e5\u8a62\u7684\u6392\u5e8f\u662f\u660e\u78ba\u7684\uff0c\u5426\u5247\u8fd4\u56de\u7684\u7b2c\u4e00\u884c\u6578\u64da\u53ef\u80fd\u4e0d\u7b26\u5408\u9810\u671f\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>LIMIT<\/code> \u6216 <code>TOP<\/code> \u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u3002<\/li>\n<li>\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5c0d\u65bc\u9650\u5236\u884c\u6578\u7684\u652f\u6301\u548c\u8a9e\u6cd5\u6709\u6240\u4e0d\u540c\uff0c\u958b\u767c\u8005\u9700\u8981\u6839\u64da\u5be6\u969b\u4f7f\u7528\u7684\u6578\u64da\u5eab\u9032\u884c\u8abf\u6574\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-loNYVouzsu\">\u7e3d\u7d50<\/h2>\n<p>\u9650\u5236 SQL \u67e5\u8a62\u8fd4\u56de\u7d50\u679c\u70ba\u9996\u884c\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u4e14\u5be6\u7528\u7684\u9700\u6c42\u3002\u901a\u904e\u4f7f\u7528\u4e0d\u540c\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u7684\u8a9e\u6cd5\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u5728\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u6642\uff0c\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u7684 SQL \u67e5\u8a62\u6280\u5de7\u5c07\u6709\u52a9\u65bc\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u9084\u662f\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u80fd\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL \u67e5\u8a62\u4e2d\u9650\u5236\u8fd4\u56de\u7d50\u679c\u70ba\u9996\u884c\u6578\u64da\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u8655\u7406\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-143751","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143751","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=143751"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143751\/revisions"}],"predecessor-version":[{"id":143752,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143751\/revisions\/143752"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}