{"id":164445,"date":"2024-11-05T07:57:26","date_gmt":"2024-11-04T23:57:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/164445\/"},"modified":"2024-11-05T07:57:28","modified_gmt":"2024-11-04T23:57:28","slug":"%e7%b2%be%e9%80%9asql-server-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%ef%bc%8c%e8%a7%a3%e6%b1%ba%e6%95%b8%e6%93%9a%e5%88%86%e6%9e%90%e9%9b%a3%e9%a1%8c-sql-server-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/164445\/","title":{"rendered":"\u7cbe\u901aSQL Server \u6578\u64da\u5eab\u67e5\u8a62\uff0c\u89e3\u6c7a\u6578\u64da\u5206\u6790\u96e3\u984c (sql server \u6578\u64da\u5eab\u67e5\u8a62)"},"content":{"rendered":"<h1 id=\"%e7%b2%be%e9%80%9asql-server-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%ef%bc%8c%e8%a7%a3%e6%b1%ba%e6%95%b8%e6%93%9a%e5%88%86%e6%9e%90%e9%9b%a3%e9%a1%8c-lZUKwQegKG\">\u7cbe\u901aSQL Server \u6578\u64da\u5eab\u67e5\u8a62\uff0c\u89e3\u6c7a\u6578\u64da\u5206\u6790\u96e3\u984c<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5206\u6790\u5df2\u6210\u70ba\u4f01\u696d\u6210\u529f\u7684\u95dc\u9375\u3002SQL Server\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u67e5\u8a62\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u7cbe\u901aSQL Server\u7684\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u4ee5\u89e3\u6c7a\u6578\u64da\u5206\u6790\u4e2d\u7684\u5404\u7a2e\u96e3\u984c\u3002<\/p>\n<h2 id=\"sql-server%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-lZUKwQegKG\">SQL Server\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>SQL Server\u662f\u4e00\u500b\u7531\u5fae\u8edf\u958b\u767c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u652f\u6301\u591a\u7528\u6236\u74b0\u5883\uff0c\u4e26\u80fd\u5920\u8655\u7406\u5927\u91cf\u6578\u64da\u3002\u5b83\u4f7f\u7528\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff08SQL\uff09\u4f86\u9032\u884c\u6578\u64da\u64cd\u4f5c\uff0c\u5305\u62ec\u67e5\u8a62\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u7b49\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-lZUKwQegKG\">\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u7684\u542b\u7fa9\u662f\u5f9e\u6307\u5b9a\u7684\u8868\u4e2d\u9078\u64c7\u7279\u5b9a\u7684\u5217\uff0c\u4e26\u6839\u64da\u689d\u4ef6\u904e\u6ffe\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u5f9e\u201cCustomers\u201d\u8868\u4e2d\u9078\u64c7\u6240\u6709\u4f86\u81ea\u201c\u9999\u6e2f\u201d\u7684\u5ba2\u6236\uff1a<\/p>\n<pre><code>SELECT * \nFROM Customers \nWHERE City = '\u9999\u6e2f';<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8join%e9%80%b2%e8%a1%8c%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%a9%a2-lZUKwQegKG\">\u4f7f\u7528JOIN\u9032\u884c\u591a\u8868\u67e5\u8a62<\/h2>\n<p>\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u3002\u9019\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528JOIN\u8a9e\u53e5\u4f86\u9023\u63a5\u4e0d\u540c\u7684\u8868\u3002\u4ee5\u4e0b\u662fINNER JOIN\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT columns\nFROM table1\nINNER JOIN table2\nON table1.common_column = table2.common_column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\u201cOrders\u201d\u548c\u201cCustomers\u201d\uff0c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6bcf\u500b\u8a02\u55ae\u7684\u5ba2\u6236\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT Orders.OrderID, Customers.CustomerName\nFROM Orders\nINNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;<\/code><\/pre>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e8%88%87%e5%88%86%e7%b5%84%e6%9f%a5%e8%a9%a2-lZUKwQegKG\">\u805a\u5408\u51fd\u6578\u8207\u5206\u7d44\u67e5\u8a62<\/h2>\n<p>\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u805a\u5408\u51fd\u6578\uff08\u5982COUNT\u3001SUM\u3001AVG\u7b49\uff09\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u5feb\u901f\u7372\u53d6\u6578\u64da\u7684\u7d71\u8a08\u4fe1\u606f\u3002\u4f7f\u7528GROUP BY\u5b50\u53e5\u53ef\u4ee5\u5c07\u7d50\u679c\u6309\u7279\u5b9a\u5217\u5206\u7d44\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8a08\u7b97\u6bcf\u500b\u57ce\u5e02\u7684\u5ba2\u6236\u6578\u91cf\uff1a<\/p>\n<pre><code>SELECT City, COUNT(*) AS CustomerCount\nFROM Customers\nGROUP BY City;<\/code><\/pre>\n<h2 id=\"%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e4%bd%bf%e7%94%a8-lZUKwQegKG\">\u5b50\u67e5\u8a62\u7684\u4f7f\u7528<\/h2>\n<p>\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u5d4c\u5957\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u5728\u9700\u8981\u6839\u64da\u53e6\u4e00\u500b\u67e5\u8a62\u7684\u7d50\u679c\u9032\u884c\u904e\u6ffe\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u9078\u64c7\u6240\u6709\u8a02\u55ae\u91d1\u984d\u5927\u65bc\u5e73\u5747\u8a02\u55ae\u91d1\u984d\u7684\u8a02\u55ae\uff1a<\/p>\n<pre><code>SELECT * \nFROM Orders \nWHERE OrderAmount &gt; (SELECT AVG(OrderAmount) FROM Orders);<\/code><\/pre>\n<h2 id=\"%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd-lZUKwQegKG\">\u512a\u5316\u67e5\u8a62\u6027\u80fd<\/h2>\n<p>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u6027\u80fd\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u7d22\u5f15\uff1a\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u907f\u514dSELECT *\uff1a\u50c5\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li>\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u6578\u64da\uff1a\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528WHERE\u5b50\u53e5\u53ef\u4ee5\u6e1b\u5c11\u8fd4\u56de\u7684\u6578\u64da\u91cf\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-lZUKwQegKG\">\u7d50\u8ad6<\/h2>\n<p>\u7cbe\u901aSQL Server\u7684\u6578\u64da\u5eab\u67e5\u8a62\u5c0d\u65bc\u89e3\u6c7a\u6578\u64da\u5206\u6790\u4e2d\u7684\u96e3\u984c\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u3001JOIN\u64cd\u4f5c\u3001\u805a\u5408\u51fd\u6578\u3001\u5b50\u67e5\u8a62\u4ee5\u53ca\u67e5\u8a62\u512a\u5316\u6280\u5de7\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u6301\u7e8c\u5b78\u7fd2\u548c\u5be6\u8e10\u5c07\u5e6b\u52a9\u60a8\u5728\u6578\u64da\u5206\u6790\u9818\u57df\u4fdd\u6301\u7af6\u722d\u529b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u5206\u6790\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\u74b0\u5883\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7cbe\u901aSQL Server\u6578\u64da\u5eab\u67e5\u8a62\uff0c\u8f15\u9b06\u89e3\u6c7a\u6578\u64da\u5206\u6790\u96e3\u984c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u52a9\u60a8\u505a\u51fa\u660e\u667a\u6c7a\u7b56\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-164445","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164445","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=164445"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164445\/revisions"}],"predecessor-version":[{"id":164446,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164445\/revisions\/164446"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=164445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=164445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=164445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}