{"id":175423,"date":"2024-11-08T05:45:19","date_gmt":"2024-11-07T21:45:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175423\/"},"modified":"2024-11-08T05:45:19","modified_gmt":"2024-11-07T21:45:19","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e9%a1%af%e7%a4%ba%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-sql%e9%a1%af%e7%a4%ba%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175423\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528SQL\u986f\u793a\u4e4b\u4e00\u500b\u6578\u64da\u5eab\uff1f (sql\u986f\u793a\u4e4b\u4e00\u500b\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e9%a1%af%e7%a4%ba%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-ohyLNCPWnQ\">\u5982\u4f55\u4f7f\u7528SQL\u986f\u793a\u4e4b\u4e00\u500b\u6578\u64da\u5eab\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002\u7576\u6211\u5011\u9700\u8981\u986f\u793a\u4e00\u500b\u6578\u64da\u5eab\u7684\u5167\u5bb9\u6642\uff0cSQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u9054\u6210\u9019\u4e00\u76ee\u6a19\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528SQL\u986f\u793a\u4e00\u500b\u6578\u64da\u5eab\u7684\u57fa\u672c\u6b65\u9a5f\u548c\u76f8\u95dc\u547d\u4ee4\u3002<\/p>\n<h2 id=\"1-%e9%80%a3%e6%8e%a5%e5%88%b0%e6%95%b8%e6%93%9a%e5%ba%ab-ohyLNCPWnQ\">1. \u9023\u63a5\u5230\u6578\u64da\u5eab<\/h2>\n<p>\u5728\u57f7\u884c\u4efb\u4f55SQL\u67e5\u8a62\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u9023\u63a5\u5230\u6578\u64da\u5eab\u3002\u9019\u901a\u5e38\u901a\u904e\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u4f86\u5b8c\u6210\uff0c\u4f8b\u5982MySQL\u3001PostgreSQL\u6216SQLite\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528MySQL\u7684\u9023\u63a5\u793a\u4f8b\uff1a<\/p>\n<pre><code>mysql -u username -p<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u60a8\u9700\u8981\u66ff\u63db\u201cusername\u201d\u70ba\u60a8\u7684\u6578\u64da\u5eab\u7528\u6236\u540d\u3002\u7cfb\u7d71\u6703\u63d0\u793a\u60a8\u8f38\u5165\u5bc6\u78bc\u3002<\/p>\n<h2 id=\"2-%e9%a1%af%e7%a4%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%97%e8%a1%a8-ohyLNCPWnQ\">2. \u986f\u793a\u6578\u64da\u5eab\u5217\u8868<\/h2>\n<p>\u9023\u63a5\u5230\u6578\u64da\u5eab\u5f8c\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u986f\u793a\u7576\u524d\u4f3a\u670d\u5668\u4e0a\u7684\u6240\u6709\u6578\u64da\u5eab\uff1a<\/p>\n<pre><code>SHOW DATABASES;<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u5c07\u5217\u51fa\u6240\u6709\u53ef\u7528\u7684\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u9078\u64c7\u8981\u67e5\u770b\u7684\u7279\u5b9a\u6578\u64da\u5eab\u3002<\/p>\n<h2 id=\"3-%e9%81%b8%e6%93%87%e6%95%b8%e6%93%9a%e5%ba%ab-ohyLNCPWnQ\">3. \u9078\u64c7\u6578\u64da\u5eab<\/h2>\n<p>\u8981\u986f\u793a\u7279\u5b9a\u6578\u64da\u5eab\u7684\u5167\u5bb9\uff0c\u9996\u5148\u9700\u8981\u9078\u64c7\u8a72\u6578\u64da\u5eab\u3002\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>USE database_name;<\/code><\/pre>\n<p>\u8acb\u5c07\u201cdatabase_name\u201d\u66ff\u63db\u70ba\u60a8\u8981\u67e5\u770b\u7684\u6578\u64da\u5eab\u540d\u7a31\u3002<\/p>\n<h2 id=\"4-%e9%a1%af%e7%a4%ba%e6%95%b8%e6%93%9a%e8%a1%a8-ohyLNCPWnQ\">4. \u986f\u793a\u6578\u64da\u8868<\/h2>\n<p>\u9078\u64c7\u6578\u64da\u5eab\u5f8c\uff0c\u60a8\u53ef\u4ee5\u67e5\u770b\u8a72\u6578\u64da\u5eab\u4e2d\u7684\u6240\u6709\u6578\u64da\u8868\u3002\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>SHOW TABLES;<\/code><\/pre>\n<p>\u9019\u5c07\u5217\u51fa\u8a72\u6578\u64da\u5eab\u4e2d\u7684\u6240\u6709\u8868\u683c\u540d\u7a31\u3002<\/p>\n<h2 id=\"5-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e8%a1%a8%e5%85%a7%e5%ae%b9-ohyLNCPWnQ\">5. \u67e5\u8a62\u6578\u64da\u8868\u5167\u5bb9<\/h2>\n<p>\u8981\u986f\u793a\u7279\u5b9a\u6578\u64da\u8868\u7684\u5167\u5bb9\uff0c\u53ef\u4ee5\u4f7f\u7528SELECT\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u67e5\u8a62\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM users;<\/code><\/pre>\n<p>\u9019\u689d\u547d\u4ee4\u5c07\u986f\u793a\u201cusers\u201d\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5217\u3002\u5982\u679c\u60a8\u53ea\u60f3\u67e5\u770b\u7279\u5b9a\u7684\u5217\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM users;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u8acb\u5c07\u201ccolumn1\u201d\u548c\u201ccolumn2\u201d\u66ff\u63db\u70ba\u60a8\u60f3\u8981\u67e5\u8a62\u7684\u5177\u9ad4\u5217\u540d\u3002<\/p>\n<h2 id=\"6-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-ohyLNCPWnQ\">6. \u4f7f\u7528\u689d\u4ef6\u67e5\u8a62<\/h2>\n<p>\u5982\u679c\u60a8\u53ea\u60f3\u986f\u793a\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u5e74\u9f61\u5927\u65bc30\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u66f4\u7cbe\u78ba\u5730\u7be9\u9078\u51fa\u60a8\u9700\u8981\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"7-%e6%8e%92%e5%ba%8f%e5%92%8c%e9%99%90%e5%88%b6%e7%b5%90%e6%9e%9c-ohyLNCPWnQ\">7. \u6392\u5e8f\u548c\u9650\u5236\u7d50\u679c<\/h2>\n<p>\u60a8\u9084\u53ef\u4ee5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u548c\u9650\u5236\u3002\u4f8b\u5982\uff0c\u6309\u5e74\u9f61\u5347\u5e8f\u6392\u5217\u4e26\u9650\u5236\u7d50\u679c\u70ba\u524d10\u689d\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY age ASC LIMIT 10;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u548c\u67e5\u770b\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ohyLNCPWnQ\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528SQL\u986f\u793a\u4e00\u500b\u6578\u64da\u5eab\u7684\u904e\u7a0b\u76f8\u5c0d\u7c21\u55ae\uff0c\u901a\u904e\u9023\u63a5\u6578\u64da\u5eab\u3001\u9078\u64c7\u6578\u64da\u5eab\u3001\u986f\u793a\u6578\u64da\u8868\u53ca\u67e5\u8a62\u6578\u64da\u8868\u5167\u5bb9\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u60a8\u662f\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9084\u662f\u958b\u767c\u4eba\u54e1\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u7684SQL\u547d\u4ee4\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684\u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528SQL\u547d\u4ee4\u986f\u793a\u7279\u5b9a\u6578\u64da\u5eab\u7684\u5167\u5bb9\uff0c\u638c\u63e1\u57fa\u672c\u67e5\u8a62\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\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-175423","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175423","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=175423"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175423\/revisions"}],"predecessor-version":[{"id":175424,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175423\/revisions\/175424"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}