{"id":81026,"date":"2024-10-16T14:55:18","date_gmt":"2024-10-16T06:55:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/81026\/"},"modified":"2024-10-16T14:55:18","modified_gmt":"2024-10-16T06:55:18","slug":"mysql%e5%b7%a6%e9%80%a3%e6%8e%a5%e3%80%81%e5%8f%b3%e9%80%a3%e6%8e%a5%e5%92%8c%e5%85%a7%e9%80%a3%e6%8e%a5%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/81026\/","title":{"rendered":"MySQL\u5de6\u9023\u63a5\u3001\u53f3\u9023\u63a5\u548c\u5167\u9023\u63a5\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"mysql%e5%b7%a6%e9%80%a3%e6%8e%a5%e3%80%81%e5%8f%b3%e9%80%a3%e6%8e%a5%e5%92%8c%e5%85%a7%e9%80%a3%e6%8e%a5%e8%a9%b3%e8%a7%a3-rjvykubXnv\">MySQL\u5de6\u9023\u63a5\u3001\u53f3\u9023\u63a5\u548c\u5167\u9023\u63a5\u8a73\u89e3<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u6578\u64da\u5eab\uff0c\u5c24\u5176\u5728\u7db2\u9801\u61c9\u7528\u7a0b\u5f0f\u4e2d\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u6642\uff0c\u9023\u63a5\uff08JOIN\uff09\u64cd\u4f5c\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39MySQL\u4e2d\u7684\u5de6\u9023\u63a5\uff08LEFT JOIN\uff09\u3001\u53f3\u9023\u63a5\uff08RIGHT JOIN\uff09\u548c\u5167\u9023\u63a5\uff08INNER JOIN\uff09\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e9b\u6982\u5ff5\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%80%a3%e6%8e%a5%ef%bc%88join%ef%bc%89%ef%bc%9f-rjvykubXnv\">\u4ec0\u9ebc\u662f\u9023\u63a5\uff08JOIN\uff09\uff1f<\/h2>\n<p>\u9023\u63a5\u662f\u4e00\u7a2e\u5f9e\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u7684\u64cd\u4f5c\u3002\u901a\u904e\u9023\u63a5\uff0c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u67d0\u4e9b\u689d\u4ef6\u5c07\u8868\u4e2d\u7684\u6578\u64da\u7d50\u5408\u5728\u4e00\u8d77\u3002MySQL\u652f\u6301\u591a\u7a2e\u9023\u63a5\u985e\u578b\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u5305\u62ec\u5167\u9023\u63a5\u3001\u5de6\u9023\u63a5\u548c\u53f3\u9023\u63a5\u3002<\/p>\n<h2 id=\"%e5%85%a7%e9%80%a3%e6%8e%a5%ef%bc%88inner-join%ef%bc%89-rjvykubXnv\">\u5167\u9023\u63a5\uff08INNER JOIN\uff09<\/h2>\n<p>\u5167\u9023\u63a5\u662f\u6700\u5e38\u898b\u7684\u9023\u63a5\u985e\u578b\u3002\u5b83\u53ea\u8fd4\u56de\u5728\u5169\u500b\u8868\u4e2d\u90fd\u5b58\u5728\u7684\u5339\u914d\u884c\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u5169\u500b\u8868\u4e2d\u7372\u53d6\u5171\u540c\u7684\u6578\u64da\u6642\uff0c\u5167\u9023\u63a5\u662f\u6700\u4f73\u9078\u64c7\u3002<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table1 a\nINNER JOIN table2 b ON a.common_column = b.common_column;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u7576table1\u548ctable2\u4e2d\u5b58\u5728\u76f8\u540c\u7684common_column\u503c\u6642\uff0c\u624d\u6703\u8fd4\u56de\u76f8\u61c9\u7684\u884c\u3002<\/p>\n<h2 id=\"%e5%b7%a6%e9%80%a3%e6%8e%a5%ef%bc%88left-join%ef%bc%89-rjvykubXnv\">\u5de6\u9023\u63a5\uff08LEFT JOIN\uff09<\/h2>\n<p>\u5de6\u9023\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u5de6\u8868\u4e2d\u7684\u67d0\u884c\u5728\u53f3\u8868\u4e2d\u627e\u4e0d\u5230\u5339\u914d\uff0c\u5247\u4ecd\u7136\u6703\u8fd4\u56de\u8a72\u884c\uff0c\u4e26\u4e14\u53f3\u8868\u7684\u76f8\u61c9\u5217\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table1 a\nLEFT JOIN table2 b ON a.common_column = b.common_column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2dtable1\u5305\u542b\u6240\u6709\u5ba2\u6236\u7684\u8cc7\u6599\uff0c\u800ctable2\u5305\u542b\u5ba2\u6236\u7684\u8a02\u55ae\u8cc7\u6599\u3002\u4f7f\u7528\u5de6\u9023\u63a5\u53ef\u4ee5\u7372\u5f97\u6240\u6709\u5ba2\u6236\u7684\u8cc7\u6599\uff0c\u5373\u4f7f\u67d0\u4e9b\u5ba2\u6236\u6c92\u6709\u4e0b\u904e\u8a02\u55ae\u3002<\/p>\n<h2 id=\"%e5%8f%b3%e9%80%a3%e6%8e%a5%ef%bc%88right-join%ef%bc%89-rjvykubXnv\">\u53f3\u9023\u63a5\uff08RIGHT JOIN\uff09<\/h2>\n<p>\u53f3\u9023\u63a5\u8207\u5de6\u9023\u63a5\u76f8\u53cd\u3002\u5b83\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u53f3\u8868\u4e2d\u7684\u67d0\u884c\u5728\u5de6\u8868\u4e2d\u627e\u4e0d\u5230\u5339\u914d\uff0c\u5247\u4ecd\u7136\u6703\u8fd4\u56de\u8a72\u884c\uff0c\u4e26\u4e14\u5de6\u8868\u7684\u76f8\u61c9\u5217\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table1 a\nRIGHT JOIN table2 b ON a.common_column = b.common_column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2dtable1\u5305\u542b\u6240\u6709\u7522\u54c1\u7684\u8cc7\u6599\uff0c\u800ctable2\u5305\u542b\u6240\u6709\u8a02\u55ae\u7684\u8cc7\u6599\u3002\u4f7f\u7528\u53f3\u9023\u63a5\u53ef\u4ee5\u7372\u5f97\u6240\u6709\u8a02\u55ae\u7684\u8cc7\u6599\uff0c\u5373\u4f7f\u67d0\u4e9b\u8a02\u55ae\u4e2d\u7684\u7522\u54c1\u5728\u7522\u54c1\u8868\u4e2d\u4e0d\u5b58\u5728\u3002<\/p>\n<h2 id=\"%e9%80%a3%e6%8e%a5%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-rjvykubXnv\">\u9023\u63a5\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u9078\u64c7\u4f7f\u7528\u54ea\u7a2e\u9023\u63a5\u53d6\u6c7a\u65bc\u5177\u9ad4\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u7576\u9700\u8981\u7372\u53d6\u6240\u6709\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u5de6\u9023\u63a5\uff1b\u800c\u7576\u9700\u8981\u7372\u53d6\u6240\u6709\u8a02\u55ae\u53ca\u5176\u5c0d\u61c9\u7684\u5ba2\u6236\u6642\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u53f3\u9023\u63a5\u3002\u5167\u9023\u63a5\u5247\u9069\u5408\u7528\u65bc\u9700\u8981\u7372\u53d6\u5169\u500b\u8868\u4e2d\u5171\u540c\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-rjvykubXnv\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u4e2d\u7684\u5de6\u9023\u63a5\u3001\u53f3\u9023\u63a5\u548c\u5167\u9023\u63a5\u662f\u6578\u64da\u5eab\u67e5\u8a62\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u4e86\u89e3\u9019\u4e9b\u9023\u63a5\u7684\u7279\u6027\u548c\u4f7f\u7528\u5834\u666f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u5167\u9023\u63a5\u7372\u53d6\u5171\u540c\u6578\u64da\uff0c\u9084\u662f\u4f7f\u7528\u5de6\u9023\u63a5\u548c\u53f3\u9023\u63a5\u7372\u53d6\u4e0d\u5b8c\u5168\u5339\u914d\u7684\u6578\u64da\uff0c\u9019\u4e9b\u6280\u8853\u90fd\u80fd\u63d0\u5347\u6578\u64da\u8655\u7406\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\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\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eMySQL\u7684\u5de6\u9023\u63a5\u3001\u53f3\u9023\u63a5\u548c\u5167\u9023\u63a5\uff0c\u4e86\u89e3\u5b83\u5011\u7684\u7528\u6cd5\u3001\u5dee\u7570\u53ca\u5be6\u969b\u61c9\u7528\u7bc4\u4f8b\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-81026","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/81026","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=81026"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/81026\/revisions"}],"predecessor-version":[{"id":81027,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/81026\/revisions\/81027"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=81026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=81026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=81026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}