{"id":180282,"date":"2024-11-09T08:55:16","date_gmt":"2024-11-09T00:55:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/180282\/"},"modified":"2024-11-09T08:55:17","modified_gmt":"2024-11-09T00:55:17","slug":"%e4%b8%8a%e5%84%84%e7%9a%84sql-server%e8%a1%a8%e9%80%b2%e8%a1%8cjoin%e7%9a%84%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/180282\/","title":{"rendered":"\u4e0a\u5104\u7684sql server\u8868\u9032\u884cjoin\u7684\u554f\u984c"},"content":{"rendered":"<h1 id=\"%e4%b8%8a%e5%84%84%e7%9a%84sql-server%e8%a1%a8%e9%80%b2%e8%a1%8cjoin%e7%9a%84%e5%95%8f%e9%a1%8c-dIaOMcyLdk\">\u4e0a\u5104\u7684SQL Server\u8868\u9032\u884cJOIN\u7684\u554f\u984c<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u7279\u5225\u662f\u7576\u6d89\u53ca\u5230\u4e0a\u5104\u689d\u8a18\u9304\u7684\u8868\u6642\uff0c\u9032\u884cJOIN\u64cd\u4f5c\u53ef\u80fd\u6703\u9762\u81e8\u8a31\u591a\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\u53ef\u80fd\u51fa\u73fe\u7684\u554f\u984c\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"join%e6%93%8d%e4%bd%9c%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-dIaOMcyLdk\">JOIN\u64cd\u4f5c\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>JOIN\u64cd\u4f5c\u662f\u7528\u65bc\u5f9e\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u6839\u64da\u76f8\u95dc\u5217\u7684\u503c\u6aa2\u7d22\u6578\u64da\u7684SQL\u8a9e\u53e5\u3002\u5e38\u898b\u7684JOIN\u985e\u578b\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u3001RIGHT JOIN\u548cFULL OUTER JOIN\u3002\u9019\u4e9b\u64cd\u4f5c\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\u81f3\u95dc\u91cd\u8981\uff0c\u4f46\u5728\u8655\u7406\u5927\u6578\u64da\u96c6\u6642\uff0c\u6027\u80fd\u554f\u984c\u53ef\u80fd\u6703\u986f\u73fe\u51fa\u4f86\u3002<\/p>\n<h2 id=\"%e4%b8%8a%e5%84%84%e6%a2%9d%e8%a8%98%e9%8c%84%e7%9a%84%e6%8c%91%e6%88%b0-dIaOMcyLdk\">\u4e0a\u5104\u689d\u8a18\u9304\u7684\u6311\u6230<\/h2>\n<p>\u7576\u8868\u4e2d\u6709\u4e0a\u5104\u689d\u8a18\u9304\u6642\uff0c\u9032\u884cJOIN\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u4ee5\u4e0b\u5e7e\u500b\u554f\u984c\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u4e0b\u964d\uff1a<\/strong>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0cJOIN\u64cd\u4f5c\u7684\u57f7\u884c\u6642\u9593\u53ef\u80fd\u6703\u986f\u8457\u589e\u52a0\uff0c\u7279\u5225\u662f\u7576\u6c92\u6709\u9069\u7576\u7684\u7d22\u5f15\u6642\u3002<\/li>\n<li><strong>\u5167\u5b58\u4f7f\u7528\u91cf\u589e\u52a0\uff1a<\/strong>\u5927\u898f\u6a21\u7684JOIN\u64cd\u4f5c\u53ef\u80fd\u6703\u6d88\u8017\u5927\u91cf\u5167\u5b58\uff0c\u5c0e\u81f4\u7cfb\u7d71\u6027\u80fd\u4e0b\u964d\uff0c\u751a\u81f3\u51fa\u73fe\u5167\u5b58\u4e0d\u8db3\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u9396\u5b9a\u554f\u984c\uff1a<\/strong>\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u9577\u6642\u9593\u7684JOIN\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u9396\u5b9a\uff0c\u5f71\u97ff\u5176\u4ed6\u67e5\u8a62\u7684\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-dIaOMcyLdk\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u6709\u6548\u5730\u8655\u7406\u4e0a\u5104\u689d\u8a18\u9304\u7684JOIN\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-dIaOMcyLdk\">1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u70baJOIN\u64cd\u4f5c\u4e2d\u7684\u76f8\u95dc\u5217\u5275\u5efa\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u6578\u64da\u6aa2\u7d22\uff0c\u6e1b\u5c11\u5168\u8868\u6383\u63cf\u7684\u9700\u8981\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_column_name ON table_name(column_name);<\/code><\/pre>\n<h3 id=\"2-%e5%88%86%e5%8d%80%e8%a1%a8-dIaOMcyLdk\">2. \u5206\u5340\u8868<\/h3>\n<p>\u5c07\u5927\u8868\u5206\u5340\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5206\u5340\u53ef\u4ee5\u6839\u64da\u67d0\u4e9b\u5217\u7684\u503c\u5c07\u6578\u64da\u5206\u6563\u5230\u4e0d\u540c\u7684\u7269\u7406\u4f4d\u7f6e\uff0c\u5f9e\u800c\u6e1b\u5c11\u6bcf\u6b21\u67e5\u8a62\u9700\u8981\u6383\u63cf\u7684\u6578\u64da\u91cf\u3002<\/p>\n<h3 id=\"3-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2-dIaOMcyLdk\">3. \u512a\u5316\u67e5\u8a62<\/h3>\n<p>\u5728\u7de8\u5bebJOIN\u67e5\u8a62\u6642\uff0c\u61c9\u8a72\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5217\u548c\u8868\uff0c\u4e26\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM table_a a\nINNER JOIN table_b b ON a.id = b.a_id\nWHERE a.status = 'active';<\/code><\/pre>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8-dIaOMcyLdk\">4. \u4f7f\u7528\u81e8\u6642\u8868<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5c07JOIN\u64cd\u4f5c\u7684\u7d50\u679c\u5b58\u5132\u5728\u81e8\u6642\u8868\u4e2d\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u91cd\u8907\u8a08\u7b97\u7684\u9700\u8981\uff0c\u7279\u5225\u662f\u5728\u591a\u6b21\u4f7f\u7528\u76f8\u540c\u7d50\u679c\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<pre><code>SELECT a.column1, b.column2\nINTO #temp_table\nFROM table_a a\nINNER JOIN table_b b ON a.id = b.a_id;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-dIaOMcyLdk\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u8655\u7406\u4e0a\u5104\u689d\u8a18\u9304\u7684SQL Server\u8868\u9032\u884cJOIN\u64cd\u4f5c\u6642\uff0c\u6027\u80fd\u548c\u8cc7\u6e90\u7ba1\u7406\u662f\u4e3b\u8981\u6311\u6230\u3002\u901a\u904e\u9069\u7576\u7684\u7d22\u5f15\u3001\u5206\u5340\u3001\u67e5\u8a62\u512a\u5316\u548c\u4f7f\u7528\u81e8\u6642\u8868\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u7cfb\u7d71\u8ca0\u64d4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc<em><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/em>\u548c<em><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u8a0e\u5728\u4e0a\u5104\u689dSQL Server\u8868\u4e2d\u9032\u884cJOIN\u64cd\u4f5c\u7684\u6311\u6230\u8207\u89e3\u6c7a\u65b9\u6848\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6027\u80fd\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-180282","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180282","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=180282"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180282\/revisions"}],"predecessor-version":[{"id":180283,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/180282\/revisions\/180283"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=180282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=180282"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=180282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}