{"id":138817,"date":"2024-10-31T15:56:22","date_gmt":"2024-10-31T07:56:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138817\/"},"modified":"2024-10-31T15:56:23","modified_gmt":"2024-10-31T07:56:23","slug":"sql-server%e5%87%bd%e6%95%b8%e7%9a%84%e5%85%a9%e7%a8%ae%e5%af%a6%e9%9a%9b%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138817\/","title":{"rendered":"SQL Server\u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5"},"content":{"rendered":"

SQL Server\u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u548c\u7ba1\u7406\u6578\u64da\uff0c\u5176\u4e2d\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u7d44\u4ef6\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u65e5\u5e38\u6578\u64da\u64cd\u4f5c\u4e2d\u5229\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n

\u4e00\u3001\u6578\u64da\u8655\u7406\u4e2d\u7684\u61c9\u7528<\/h2>\n

SQL Server\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u6578\u64da\u8655\u7406\uff0c\u7279\u5225\u662f\u5728\u67e5\u8a62\u548c\u6578\u64da\u8f49\u63db\u65b9\u9762\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u8a08\u7b97\u3001\u683c\u5f0f\u5316\u548c\u6578\u64da\u985e\u578b\u8f49\u63db\u7b49\u64cd\u4f5c\u3002<\/p>\n

1. \u6578\u64da\u8a08\u7b97<\/h3>\n

\u5728SQL Server\u4e2d\uff0c\u6578\u5b78\u51fd\u6578\u5982 SUM()<\/code>\u3001AVG()<\/code> \u548c COUNT()<\/code> \u7b49\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u6578\u64da\u8a08\u7b97\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba Sales<\/code> \u7684\u8868\uff0c\u5305\u542b\u92b7\u552e\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u8a08\u7b97\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n

SELECT SUM(Amount) AS TotalSales\nFROM Sales;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de Sales<\/code> \u8868\u4e2d\u6240\u6709\u92b7\u552e\u91d1\u984d\u7684\u7e3d\u548c\u3002\u985e\u4f3c\u5730\uff0c\u6211\u5011\u4e5f\u53ef\u4ee5\u4f7f\u7528 AVG()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u5e73\u5747\u92b7\u552e\u984d\uff1a<\/p>\n
SELECT AVG(Amount) AS AverageSales\nFROM Sales;<\/code><\/pre>\n
2. \u6578\u64da\u683c\u5f0f\u5316<\/h3>\n
\u9664\u4e86\u6578\u64da\u8a08\u7b97\uff0cSQL Server\u9084\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u683c\u5f0f\u5316\u6578\u64da\u3002\u4f8b\u5982\uff0cFORMAT()<\/code> \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u683c\u5f0f\u5316\u65e5\u671f\u548c\u6578\u5b57\u3002\u5047\u8a2d\u6211\u5011\u60f3\u8981\u5c07\u92b7\u552e\u65e5\u671f\u683c\u5f0f\u5316\u70ba\u66f4\u6613\u8b80\u7684\u5f62\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT FORMAT(SaleDate, 'yyyy-MM-dd') AS FormattedDate\nFROM Sales;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u5c07 SaleDate<\/code> \u7684\u683c\u5f0f\u8f49\u63db\u70ba YYYY-MM-DD<\/code> \u7684\u5f62\u5f0f\uff0c\u4fbf\u65bc\u5831\u544a\u548c\u5206\u6790\u3002<\/p>\n
\u4e8c\u3001\u6578\u64da\u6e05\u7406\u4e2d\u7684\u61c9\u7528<\/h2>\n
SQL Server\u51fd\u6578\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\u4e5f\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u6578\u64da\u6e05\u7406\u662f\u78ba\u4fdd\u6578\u64da\u8cea\u91cf\u7684\u95dc\u9375\u6b65\u9a5f\uff0c\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u548c\u8655\u7406\u4e0d\u4e00\u81f4\u6216\u4e0d\u6b63\u78ba\u7684\u6578\u64da\u3002<\/p>\n
1. \u5b57\u7b26\u4e32\u8655\u7406<\/h3>\n
\u5728\u6578\u64da\u6e05\u7406\u4e2d\uff0c\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\u5982 TRIM()<\/code>\u3001UPPER()<\/code> \u548c LOWER()<\/code> \u53ef\u4ee5\u7528\u4f86\u6a19\u6e96\u5316\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u540d\u7684\u5217\uff0c\u6211\u5011\u5e0c\u671b\u5c07\u6240\u6709\u7528\u6236\u540d\u8f49\u63db\u70ba\u5c0f\u5beb\u4ee5\u4fdd\u6301\u4e00\u81f4\u6027\uff1a<\/p>\n
SELECT LOWER(Username) AS NormalizedUsername\nFROM Users;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6240\u6709\u7528\u6236\u540d\u90fd\u662f\u5c0f\u5beb\uff0c\u907f\u514d\u56e0\u5927\u5c0f\u5beb\u4e0d\u4e00\u81f4\u800c\u5c0e\u81f4\u7684\u91cd\u8907\u6578\u64da\u3002<\/p>\n
2. \u8655\u7406\u7a7a\u503c<\/h3>\n
\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0c\u8655\u7406\u7a7a\u503c\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u4efb\u52d9\u3002SQL Server\u63d0\u4f9b\u4e86 ISNULL()<\/code> \u548c COALESCE()<\/code> \u51fd\u6578\u4f86\u8655\u7406\u7a7a\u503c\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5c07\u6240\u6709\u7a7a\u7684\u92b7\u552e\u91d1\u984d\u66ff\u63db\u70ba\u96f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT ISNULL(Amount, 0) AS AdjustedAmount\nFROM Sales;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u8a08\u7b97\u7e3d\u92b7\u552e\u984d\u6642\u4e0d\u6703\u56e0\u70ba\u7a7a\u503c\u800c\u5f71\u97ff\u7d50\u679c\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
SQL Server\u51fd\u6578\u5728\u6578\u64da\u8655\u7406\u548c\u6578\u64da\u6e05\u7406\u4e2d\u5177\u6709\u91cd\u8981\u7684\u5be6\u969b\u61c9\u7528\u3002\u901a\u904e\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u7121\u8ad6\u662f\u5728\u8a08\u7b97\u3001\u683c\u5f0f\u5316\u9084\u662f\u6e05\u7406\u6578\u64da\u65b9\u9762\uff0cSQL Server\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u9805\u76ee\u4e2d\u4f7f\u7528 VPS<\/a> \u4f86\u904b\u884c SQL Server \u6709\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22SQL Server\u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u52a9\u529b\u6578\u64da\u5206\u6790\u8207\u7ba1\u7406\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-138817","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138817","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=138817"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138817\/revisions"}],"predecessor-version":[{"id":138818,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138817\/revisions\/138818"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}