{"id":173241,"date":"2024-11-07T16:21:17","date_gmt":"2024-11-07T08:21:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173241\/"},"modified":"2024-11-07T16:21:17","modified_gmt":"2024-11-07T08:21:17","slug":"%e5%a6%82%e4%bd%95%e5%be%9e%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%b8%e5%87%ba%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%b8%e5%87%ba%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173241\/","title":{"rendered":"\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u8f38\u51fa\u591a\u884c\u6578\u64da\uff1f (\u6578\u64da\u5eab\u8f38\u51fa\u591a\u884c\u6578\u64da)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%be%9e%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%b8%e5%87%ba%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a%ef%bc%9f-VaSisnMJDQ\">\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u8f38\u51fa\u591a\u884c\u6578\u64da\uff1f<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u666e\u904d\u3002\u7121\u8ad6\u662f\u7db2\u7ad9\u3001\u79fb\u52d5\u61c9\u7528\u9084\u662f\u4f01\u696d\u7cfb\u7d71\uff0c\u6578\u64da\u5eab\u90fd\u662f\u5b58\u5132\u548c\u7ba1\u7406\u6578\u64da\u7684\u6838\u5fc3\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u591a\u884c\u6578\u64da\u6642\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u57f7\u884c\u9019\u4e00\u64cd\u4f5c\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u4e2d\u8f38\u51fa\u591a\u884c\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e5%9f%ba%e7%a4%8e-VaSisnMJDQ\">\u6578\u64da\u5eab\u67e5\u8a62\u57fa\u790e<\/h2>\n<p>\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u4e86\u89e3\u4e00\u4e9b\u57fa\u672c\u7684\u6578\u64da\u5eab\u67e5\u8a62\u6982\u5ff5\u3002\u6700\u5e38\u7528\u7684\u67e5\u8a62\u8a9e\u8a00\u662fSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\uff0c\u5b83\u5141\u8a31\u7528\u6236\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u6211\u5011\u901a\u5e38\u4f7f\u7528SELECT\u8a9e\u53e5\u3002<\/p>\n<pre><code>SELECT column1, column2 FROM table_name;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e\u6307\u5b9a\u7684\u8868\u4e2d\u9078\u64c7\u7279\u5b9a\u7684\u5217\u3002\u82e5\u8981\u63d0\u53d6\u591a\u884c\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u4f86\u6307\u5b9a\u689d\u4ef6\uff0c\u6216\u8005\u4e0d\u4f7f\u7528\u4efb\u4f55\u689d\u4ef6\u4f86\u7372\u53d6\u6574\u500b\u8868\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e8%bc%b8%e5%87%ba%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a%e7%9a%84%e7%a4%ba%e4%be%8b-VaSisnMJDQ\">\u8f38\u51fa\u591a\u884c\u6578\u64da\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5f9e\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u63d0\u53d6\u591a\u884c\u6578\u64da\u3002\u5047\u8a2d\u6211\u5011\u7684\u201cusers\u201d\u8868\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nCREATE TABLE users (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    email VARCHAR(100)\n);\n<\/code><\/pre>\n<p>\u8981\u5f9e\u9019\u500b\u8868\u4e2d\u63d0\u53d6\u6240\u6709\u7528\u6236\u7684\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u201cusers\u201d\u8868\u4e2d\u7684\u6240\u6709\u884c\u548c\u5217\u3002\u5982\u679c\u6211\u5011\u53ea\u60f3\u63d0\u53d6\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u6578\u64da\uff0c\u4f8b\u5982\u6240\u6709\u96fb\u5b50\u90f5\u4ef6\u4ee5\u201c@example.com\u201d\u7d50\u5c3e\u7684\u7528\u6236\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE email LIKE '%@example.com';<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8limit%e9%99%90%e5%88%b6%e8%bc%b8%e5%87%ba%e8%a1%8c%e6%95%b8-VaSisnMJDQ\">\u4f7f\u7528LIMIT\u9650\u5236\u8f38\u51fa\u884c\u6578<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u60f3\u63d0\u53d6\u7279\u5b9a\u6578\u91cf\u7684\u884c\u3002\u9019\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528LIMIT\u5b50\u53e5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u7372\u53d6\u524d10\u500b\u7528\u6236\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT * FROM users LIMIT 10;<\/code><\/pre>\n<h2 id=\"%e5%be%9e%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%bc%b8%e5%87%ba%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-VaSisnMJDQ\">\u5f9e\u6578\u64da\u5eab\u4e2d\u8f38\u51fa\u591a\u884c\u6578\u64da\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u78ba\u4fdd\u5728\u67e5\u8a62\u7684\u5217\u4e0a\u4f7f\u7528\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u5118\u91cf\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u50b3\u8f38\u3002<\/li>\n<li><strong>\u4f7f\u7528JOIN\uff1a<\/strong>\u5982\u679c\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u5408\u4f75\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 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href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u548c\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u4f01\u696d\u9700\u6c42\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u60a8\u7684\u696d\u52d9\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u4e2d\u6709\u6548\u8f38\u51fa\u591a\u884c\u6578\u64da\uff0c\u638c\u63e1\u67e5\u8a62\u8a9e\u53e5\u548c\u6578\u64da\u8655\u7406\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-173241","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173241","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=173241"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173241\/revisions"}],"predecessor-version":[{"id":173242,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173241\/revisions\/173242"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}