{"id":76078,"date":"2024-10-16T03:40:18","date_gmt":"2024-10-15T19:40:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76078\/"},"modified":"2024-10-16T03:40:18","modified_gmt":"2024-10-15T19:40:18","slug":"mysql%e8%81%af%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%8f%8a%e8%81%af%e8%a1%a8%e5%88%aa%e9%99%a4%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76078\/","title":{"rendered":"MySQL\u806f\u8868\u67e5\u8a62\u53ca\u806f\u8868\u522a\u9664\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e8%81%af%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%8f%8a%e8%81%af%e8%a1%a8%e5%88%aa%e9%99%a4%e7%9a%84%e6%96%b9%e6%b3%95-IXhNoVEqtz\">MySQL\u806f\u8868\u67e5\u8a62\u53ca\u806f\u8868\u522a\u9664\u7684\u65b9\u6cd5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u806f\u8868\u67e5\u8a62\u548c\u806f\u8868\u522a\u9664\u662fMySQL\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u80fd\u5920\u6709\u6548\u5730\u8655\u7406\u591a\u500b\u8868\u4e4b\u9593\u7684\u6578\u64da\u95dc\u806f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u7a2e\u64cd\u4f5c\u7684\u57fa\u672c\u6982\u5ff5\u3001\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%81%af%e8%a1%a8%e6%9f%a5%e8%a9%a2%ef%bc%9f-IXhNoVEqtz\">\u4ec0\u9ebc\u662f\u806f\u8868\u67e5\u8a62\uff1f<\/h2>\n<p>\u806f\u8868\u67e5\u8a62\uff08JOIN\uff09\u662f\u6307\u5728\u67e5\u8a62\u4e2d\u540c\u6642\u5f9e\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u9019\u7a2e\u67e5\u8a62\u901a\u5e38\u7528\u65bc\u9700\u8981\u5f9e\u4e0d\u540c\u8868\u4e2d\u7372\u53d6\u76f8\u95dc\u6578\u64da\u7684\u60c5\u6cc1\u3002MySQL\u652f\u6301\u591a\u7a2e\u806f\u8868\u67e5\u8a62\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>INNER JOIN<\/strong>\uff1a\u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>LEFT JOIN<\/strong>\uff1a\u8fd4\u56de\u5de6\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>RIGHT JOIN<\/strong>\uff1a\u8fd4\u56de\u53f3\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>FULL OUTER JOIN<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u6240\u6709\u7684\u884c\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u3002<\/li>\n<\/ul>\n<h3 id=\"inner-join%e7%9a%84%e8%aa%9e%e6%b3%95%e7%a4%ba%e4%be%8b-IXhNoVEqtz\">INNER JOIN\u7684\u8a9e\u6cd5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT a.column1, b.column2\nFROM table1 a\nINNER JOIN table2 b ON a.common_field = b.common_field;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c`table1`\u548c`table2`\u662f\u5169\u500b\u8868\uff0c`common_field`\u662f\u5b83\u5011\u4e4b\u9593\u7684\u95dc\u806f\u5b57\u6bb5\u3002\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728\u9019\u5169\u500b\u8868\u4e2d\u90fd\u6709\u7684\u884c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%81%af%e8%a1%a8%e5%88%aa%e9%99%a4%ef%bc%9f-IXhNoVEqtz\">\u4ec0\u9ebc\u662f\u806f\u8868\u522a\u9664\uff1f<\/h2>\n<p>\u806f\u8868\u522a\u9664\u662f\u6307\u5728\u522a\u9664\u64cd\u4f5c\u4e2d\u540c\u6642\u5f71\u97ff\u591a\u500b\u8868\u7684\u6578\u64da\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528\u806f\u63a5\u4f86\u78ba\u5b9a\u8981\u522a\u9664\u7684\u884c\u3002MySQL\u4e2d\uff0c\u806f\u8868\u522a\u9664\u7684\u8a9e\u6cd5\u76f8\u5c0d\u8907\u96dc\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u660e\u78ba\u6307\u5b9a\u8981\u522a\u9664\u7684\u8868\u548c\u689d\u4ef6\u3002<\/p>\n<h3 id=\"%e8%81%af%e8%a1%a8%e5%88%aa%e9%99%a4%e7%9a%84%e8%aa%9e%e6%b3%95%e7%a4%ba%e4%be%8b-IXhNoVEqtz\">\u806f\u8868\u522a\u9664\u7684\u8a9e\u6cd5\u793a\u4f8b<\/h3>\n<pre><code>\nDELETE a, b\nFROM table1 a\nINNER JOIN table2 b ON a.common_field = b.common_field\nWHERE a.condition_field = 'some_value';\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c`DELETE`\u8a9e\u53e5\u5c07\u540c\u6642\u522a\u9664`table1`\u548c`table2`\u4e2d\u7b26\u5408\u689d\u4ef6\u7684\u884c\u3002\u9019\u6a23\u7684\u64cd\u4f5c\u9700\u8981\u8b39\u614e\u4f7f\u7528\uff0c\u4ee5\u907f\u514d\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%81%af%e8%a1%a8%e6%9f%a5%e8%a9%a2%e5%92%8c%e5%88%aa%e9%99%a4%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-IXhNoVEqtz\">\u4f7f\u7528\u806f\u8868\u67e5\u8a62\u548c\u522a\u9664\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027<\/strong>\uff1a\u5728\u9032\u884c\u806f\u8868\u522a\u9664\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u4e0d\u6703\u7834\u58de\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u7279\u5225\u662f\u5728\u6d89\u53ca\u5916\u9375\u7d04\u675f\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf<\/strong>\uff1a\u806f\u8868\u67e5\u8a62\u548c\u522a\u9664\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u5efa\u8b70\u5c0d\u67e5\u8a62\u9032\u884c\u512a\u5316\uff0c\u4f7f\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li><strong>\u5099\u4efd\u6578\u64da<\/strong>\uff1a\u5728\u9032\u884c\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-IXhNoVEqtz\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u7684\u806f\u8868\u67e5\u8a62\u548c\u806f\u8868\u522a\u9664\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u90e8\u5206\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528\u9019\u4e9b\u529f\u80fd\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u9084\u662f\u522a\u9664\uff0c\u7406\u89e3\u5176\u8a9e\u6cd5\u548c\u61c9\u7528\u5834\u666f\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u806f\u8868\u67e5\u8a62\u8207\u806f\u8868\u522a\u9664\u7684\u65b9\u6cd5\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u7ba1\u7406\u591a\u8868\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u64cd\u4f5c\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-76078","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76078","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=76078"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76078\/revisions"}],"predecessor-version":[{"id":76079,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76078\/revisions\/76079"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76078"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76078"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76078"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}