{"id":168433,"date":"2024-11-06T12:20:40","date_gmt":"2024-11-06T04:20:40","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168433\/"},"modified":"2024-11-06T12:20:41","modified_gmt":"2024-11-06T04:20:41","slug":"sql-%e8%aa%9e%e5%8f%a5%ef%bc%9a%e7%8d%b2%e5%8f%96%e5%85%a9%e5%bc%b5%e8%a1%a8%e4%b8%ad%e7%9b%b8%e5%90%8c%e5%80%bc%e5%8f%96%e7%ac%ac%e4%ba%8c%e5%bc%b5%e8%a1%a8%e7%9a%84%e6%95%b8%e6%93%9a-%e4%ba%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168433\/","title":{"rendered":"SQL \u8a9e\u53e5\uff1a\u7372\u53d6\u5169\u5f35\u8868\u4e2d\u76f8\u540c\u503c\u53d6\u7b2c\u4e8c\u5f35\u8868\u7684\u6578\u64da (\u4e8c\u5f35\u8868\u76f8\u540c\u503c\u53d6\u7b2c\u4e8c\u5f35\u8868\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"sql-%e8%aa%9e%e5%8f%a5%ef%bc%9a%e7%8d%b2%e5%8f%96%e5%85%a9%e5%bc%b5%e8%a1%a8%e4%b8%ad%e7%9b%b8%e5%90%8c%e5%80%bc%e5%8f%96%e7%ac%ac%e4%ba%8c%e5%bc%b5%e8%a1%a8%e7%9a%84%e6%95%b8%e6%93%9a-hEhAfpjpPM\">SQL \u8a9e\u53e5\uff1a\u7372\u53d6\u5169\u5f35\u8868\u4e2d\u76f8\u540c\u503c\u53d6\u7b2c\u4e8c\u5f35\u8868\u7684\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u76f8\u95dc\u6578\u64da\u3002\u7279\u5225\u662f\u5728\u95dc\u806f\u6578\u64da\u5eab\u4e2d\uff0c\u901a\u904e SQL \u8a9e\u53e5\u4f86\u7372\u53d6\u5169\u5f35\u8868\u4e2d\u76f8\u540c\u503c\u7684\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u7372\u53d6\u5169\u5f35\u8868\u4e2d\u76f8\u540c\u503c\u7684\u6578\u64da\uff0c\u4e26\u4ee5\u7b2c\u4e8c\u5f35\u8868\u7684\u6578\u64da\u70ba\u4e3b\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-hEhAfpjpPM\">\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u8868\u662f\u6578\u64da\u7684\u57fa\u672c\u7d50\u69cb\uff0c\u901a\u5e38\u7531\u884c\u548c\u5217\u7d44\u6210\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u5169\u5f35\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528 JOIN \u64cd\u4f5c\u3002JOIN \u64cd\u4f5c\u53ef\u4ee5\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u5c07\u5169\u5f35\u8868\u7684\u6578\u64da\u7d50\u5408\u8d77\u4f86\uff0c\u5f9e\u800c\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-inner-join-%e7%8d%b2%e5%8f%96%e7%9b%b8%e5%90%8c%e5%80%bc-hEhAfpjpPM\">\u4f7f\u7528 INNER JOIN \u7372\u53d6\u76f8\u540c\u503c<\/h2>\n<p>INNER JOIN \u662f\u6700\u5e38\u7528\u7684 JOIN \u985e\u578b\u4e4b\u4e00\uff0c\u5b83\u53ea\u8fd4\u56de\u5169\u5f35\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u5047\u8a2d\u6211\u5011\u6709\u5169\u5f35\u8868\uff1a<code>table1<\/code> \u548c <code>table2<\/code>\uff0c\u5b83\u5011\u90fd\u6709\u4e00\u500b\u5171\u540c\u7684\u5217 <code>id<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u5f9e <code>table2<\/code> \u4e2d\u7372\u53d6\u6240\u6709\u8207 <code>table1<\/code> \u4e2d\u7684 <code>id<\/code> \u76f8\u540c\u7684\u884c\u3002<\/p>\n<pre><code>SELECT table2.*\nFROM table1\nINNER JOIN table2 ON table1.id = table2.id;<\/code><\/pre>\n<p>\u4e0a\u8ff0 SQL \u8a9e\u53e5\u7684\u89e3\u91cb\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><code>SELECT table2.*<\/code>\uff1a\u9019\u8868\u793a\u6211\u5011\u5e0c\u671b\u9078\u64c7 <code>table2<\/code> \u4e2d\u7684\u6240\u6709\u5217\u3002<\/li>\n<li><code>FROM table1<\/code>\uff1a\u9019\u662f\u6211\u5011\u7684\u4e3b\u8868\u3002<\/li>\n<li><code>INNER JOIN table2 ON table1.id = table2.id<\/code>\uff1a\u9019\u8868\u793a\u6211\u5011\u5c07 <code>table1<\/code> \u548c <code>table2<\/code> \u9032\u884c\u5167\u90e8\u9023\u63a5\uff0c\u689d\u4ef6\u662f\u5169\u5f35\u8868\u4e2d\u7684 <code>id<\/code> \u5217\u76f8\u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8-left-join-%e7%8d%b2%e5%8f%96%e7%9b%b8%e5%90%8c%e5%80%bc-hEhAfpjpPM\">\u4f7f\u7528 LEFT JOIN \u7372\u53d6\u76f8\u540c\u503c<\/h2>\n<p>\u9664\u4e86 INNER JOIN\uff0cLEFT JOIN \u4e5f\u662f\u4e00\u7a2e\u5e38\u7528\u7684\u9023\u63a5\u65b9\u5f0f\u3002LEFT JOIN \u6703\u8fd4\u56de\u5de6\u908a\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u908a\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u4e5f\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre><code>SELECT table2.*\nFROM table1\nLEFT JOIN table2 ON table1.id = table2.id\nWHERE table2.id IS NOT NULL;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 LEFT JOIN \u4f86\u7372\u53d6 <code>table1<\/code> \u4e2d\u6240\u6709\u7684\u884c\uff0c\u4e26\u4e14\u53ea\u9078\u64c7\u90a3\u4e9b\u5728 <code>table2<\/code> \u4e2d\u6709\u5339\u914d\u7684\u884c\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6211\u5011\u7372\u53d6\u5230\u7684\u6578\u64da\u662f\u5b8c\u6574\u7684\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%8d%b2%e5%8f%96%e7%9b%b8%e5%90%8c%e5%80%bc-hEhAfpjpPM\">\u4f7f\u7528\u5b50\u67e5\u8a62\u7372\u53d6\u76f8\u540c\u503c<\/h2>\n<p>\u9664\u4e86 JOIN \u64cd\u4f5c\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u7372\u53d6\u76f8\u540c\u503c\u7684\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u66f4\u76f4\u89c0\u3002<\/p>\n<pre><code>SELECT *\nFROM table2\nWHERE id IN (SELECT id FROM table1);<\/code><\/pre>\n<p>\u9019\u689d SQL \u8a9e\u53e5\u7684\u610f\u601d\u662f\uff1a\u5f9e <code>table2<\/code> \u4e2d\u9078\u64c7\u6240\u6709 <code>id<\/code> \u5728 <code>table1<\/code> \u4e2d\u5b58\u5728\u7684\u884c\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u8655\u7406\u5c0f\u578b\u6578\u64da\u96c6\u6642\u975e\u5e38\u6709\u6548\uff0c\u4f46\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hEhAfpjpPM\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u7372\u53d6\u5169\u5f35\u8868\u4e2d\u76f8\u540c\u503c\u7684\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u904e INNER JOIN\u3001LEFT JOIN \u6216\u5b50\u67e5\u8a62\u4f86\u5be6\u73fe\u3002\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u548c\u6578\u64da\u7684\u6e96\u78ba\u6027\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\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u670d\u52a1\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u5b89\u5168\u7684\u74b0\u5883\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u5f9e\u5169\u5f35\u8868\u4e2d\u7372\u53d6\u76f8\u540c\u503c\uff0c\u4e26\u63d0\u53d6\u7b2c\u4e8c\u5f35\u8868\u7684\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\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-168433","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168433","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=168433"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168433\/revisions"}],"predecessor-version":[{"id":168434,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168433\/revisions\/168434"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}