{"id":138741,"date":"2024-10-31T15:47:20","date_gmt":"2024-10-31T07:47:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138741\/"},"modified":"2024-10-31T15:47:21","modified_gmt":"2024-10-31T07:47:21","slug":"sql-server%e9%ab%98%e7%b4%9a%e5%85%a7%e5%ae%b9%ef%bc%9a%e5%ad%90%e6%9f%a5%e8%a9%a2%e5%92%8c%e8%a1%a8%e9%8f%88%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138741\/","title":{"rendered":"SQL Server\u9ad8\u7d1a\u5167\u5bb9\uff1a\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5"},"content":{"rendered":"<h1 id=\"sql-server%e9%ab%98%e7%b4%9a%e5%85%a7%e5%ae%b9%ef%bc%9a%e5%ad%90%e6%9f%a5%e8%a9%a2%e5%92%8c%e8%a1%a8%e9%8f%88%e6%8e%a5-zfrZvXLEPs\">SQL Server\u9ad8\u7d1a\u5167\u5bb9\uff1a\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u696d\u52d9\u74b0\u5883\u4e2d\u3002\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u4f86\u8aaa\uff0c\u7406\u89e3\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u500b\u6982\u5ff5\uff0c\u4e26\u63d0\u4f9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u638c\u63e1\u9019\u4e9b\u6280\u8853\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%ad%90%e6%9f%a5%e8%a9%a2%ef%bc%9f-zfrZvXLEPs\">\u4ec0\u9ebc\u662f\u5b50\u67e5\u8a62\uff1f<\/h2>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\u5d4c\u5957\u7684\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u5b83\u53ef\u4ee5\u7528\u65bc\u5f9e\u4e00\u500b\u67e5\u8a62\u7684\u7d50\u679c\u4e2d\u7372\u53d6\u6578\u64da\uff0c\u4e26\u5728\u5916\u90e8\u67e5\u8a62\u4e2d\u4f7f\u7528\u3002\u5b50\u67e5\u8a62\u901a\u5e38\u7528\u65bc\u9700\u8981\u6839\u64da\u5176\u4ed6\u67e5\u8a62\u7684\u7d50\u679c\u4f86\u904e\u6ffe\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/p>\n<h3 id=\"%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-zfrZvXLEPs\">\u5b50\u67e5\u8a62\u7684\u985e\u578b<\/h3>\n<ul>\n<li><strong>\u55ae\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u55ae\u4e00\u884c\u7684\u7d50\u679c\u3002<\/li>\n<li><strong>\u591a\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u591a\u884c\u7684\u7d50\u679c\u3002<\/li>\n<li><strong>\u76f8\u95dc\u5b50\u67e5\u8a62\uff1a<\/strong>\u4f9d\u8cf4\u65bc\u5916\u90e8\u67e5\u8a62\u7684\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%a4%ba%e4%be%8b-zfrZvXLEPs\">\u5b50\u67e5\u8a62\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u793a\u4f8b\uff0c\u8a72\u67e5\u8a62\u5f9e\u201c\u54e1\u5de5\u201d\u8868\u4e2d\u9078\u64c7\u6240\u6709\u85aa\u6c34\u9ad8\u65bc\u5e73\u5747\u85aa\u6c34\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * \nFROM \u54e1\u5de5 \nWHERE \u85aa\u6c34 &gt; (SELECT AVG(\u85aa\u6c34) FROM \u54e1\u5de5);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5167\u90e8\u7684\u5b50\u67e5\u8a62\u8a08\u7b97\u4e86\u6240\u6709\u54e1\u5de5\u7684\u5e73\u5747\u85aa\u6c34\uff0c\u800c\u5916\u90e8\u67e5\u8a62\u5247\u9078\u64c7\u4e86\u6240\u6709\u85aa\u6c34\u9ad8\u65bc\u8a72\u5e73\u5747\u503c\u7684\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a1%a8%e9%8f%88%e6%8e%a5%ef%bc%9f-zfrZvXLEPs\">\u4ec0\u9ebc\u662f\u8868\u93c8\u63a5\uff1f<\/h2>\n<p>\u8868\u93c8\u63a5\u662f\u6307\u5728SQL\u67e5\u8a62\u4e2d\u5c07\u591a\u500b\u8868\u9023\u63a5\u5728\u4e00\u8d77\uff0c\u4ee5\u4fbf\u5f9e\u9019\u4e9b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u8868\u93c8\u63a5\u901a\u5e38\u7528\u65bc\u9700\u8981\u5f9e\u4e0d\u540c\u8868\u4e2d\u7372\u53d6\u76f8\u95dc\u6578\u64da\u7684\u60c5\u6cc1\u3002SQL Server\u652f\u6301\u591a\u7a2e\u93c8\u63a5\u985e\u578b\uff0c\u5305\u62ec\u5167\u90e8\u93c8\u63a5\u3001\u5916\u90e8\u93c8\u63a5\u548c\u4ea4\u53c9\u93c8\u63a5\u3002<\/p>\n<h3 id=\"%e8%a1%a8%e9%8f%88%e6%8e%a5%e7%9a%84%e9%a1%9e%e5%9e%8b-zfrZvXLEPs\">\u8868\u93c8\u63a5\u7684\u985e\u578b<\/h3>\n<ul>\n<li><strong>\u5167\u90e8\u93c8\u63a5\uff08INNER JOIN\uff09\uff1a<\/strong>\u50c5\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5de6\u5916\u90e8\u93c8\u63a5\uff08LEFT JOIN\uff09\uff1a<\/strong>\u8fd4\u56de\u5de6\u8868\u7684\u6240\u6709\u884c\u53ca\u53f3\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u53f3\u5916\u90e8\u93c8\u63a5\uff08RIGHT JOIN\uff09\uff1a<\/strong>\u8fd4\u56de\u53f3\u8868\u7684\u6240\u6709\u884c\u53ca\u5de6\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5168\u5916\u90e8\u93c8\u63a5\uff08FULL OUTER JOIN\uff09\uff1a<\/strong>\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/li>\n<\/ul>\n<h3 id=\"%e8%a1%a8%e9%8f%88%e6%8e%a5%e7%a4%ba%e4%be%8b-zfrZvXLEPs\">\u8868\u93c8\u63a5\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u5167\u90e8\u93c8\u63a5\u7684\u793a\u4f8b\uff0c\u8a72\u67e5\u8a62\u5f9e\u201c\u8a02\u55ae\u201d\u548c\u201c\u5ba2\u6236\u201d\u8868\u4e2d\u9078\u64c7\u6240\u6709\u8a02\u55ae\u53ca\u5176\u5c0d\u61c9\u7684\u5ba2\u6236\u4fe1\u606f\uff1a<\/p>\n<pre><code>SELECT \u8a02\u55ae.\u8a02\u55aeID, \u5ba2\u6236.\u5ba2\u6236\u540d\u7a31 \nFROM \u8a02\u55ae \nINNER JOIN \u5ba2\u6236 ON \u8a02\u55ae.\u5ba2\u6236ID = \u5ba2\u6236.\u5ba2\u6236ID;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5167\u90e8\u93c8\u63a5\u5c07\u201c\u8a02\u55ae\u201d\u8868\u548c\u201c\u5ba2\u6236\u201d\u8868\u6839\u64da\u201c\u5ba2\u6236ID\u201d\u9032\u884c\u5339\u914d\uff0c\u5f9e\u800c\u7372\u53d6\u6bcf\u500b\u8a02\u55ae\u7684\u5ba2\u6236\u540d\u7a31\u3002<\/p>\n<h2 id=\"%e5%ad%90%e6%9f%a5%e8%a9%a2%e8%88%87%e8%a1%a8%e9%8f%88%e6%8e%a5%e7%9a%84%e6%af%94%e8%bc%83-zfrZvXLEPs\">\u5b50\u67e5\u8a62\u8207\u8868\u93c8\u63a5\u7684\u6bd4\u8f03<\/h2>\n<p>\u96d6\u7136\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5\u90fd\u53ef\u4ee5\u7528\u4f86\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\uff0c\u4f46\u5b83\u5011\u7684\u4f7f\u7528\u5834\u666f\u6709\u6240\u4e0d\u540c\u3002\u5b50\u67e5\u8a62\u901a\u5e38\u7528\u65bc\u9700\u8981\u57fa\u65bc\u67d0\u4e9b\u689d\u4ef6\u904e\u6ffe\u6578\u64da\u7684\u60c5\u6cc1\uff0c\u800c\u8868\u93c8\u63a5\u5247\u66f4\u9069\u5408\u65bc\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u76f8\u95dc\u6578\u64da\u7684\u60c5\u6cc1\u3002\u9078\u64c7\u4f7f\u7528\u54ea\u4e00\u7a2e\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u9700\u6c42\u548c\u67e5\u8a62\u7684\u8907\u96dc\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-zfrZvXLEPs\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5\u662f\u5169\u7a2e\u5f37\u5927\u7684\u6578\u64da\u6aa2\u7d22\u6280\u8853\u3002\u7406\u89e3\u5b83\u5011\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u9069\u7528\u5834\u666f\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u66f4\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u904e\u6ffe\u6578\u64da\uff0c\u9084\u662f\u4f7f\u7528\u8868\u93c8\u63a5\u4f86\u7372\u53d6\u76f8\u95dc\u4fe1\u606f\uff0c\u9019\u4e9b\u6280\u8853\u90fd\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\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\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u7684\u9ad8\u7d1a\u5167\u5bb9\uff0c\u6df1\u5165\u4e86\u89e3\u5b50\u67e5\u8a62\u548c\u8868\u93c8\u63a5\u7684\u4f7f\u7528\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\u548c\u9748\u6d3b\u6027\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-138741","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138741","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=138741"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138741\/revisions"}],"predecessor-version":[{"id":138742,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138741\/revisions\/138742"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}