{"id":139009,"date":"2024-10-31T17:28:21","date_gmt":"2024-10-31T09:28:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139009\/"},"modified":"2024-10-31T17:28:22","modified_gmt":"2024-10-31T09:28:22","slug":"sql-server%e6%97%a5%e6%9c%9f%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139009\/","title":{"rendered":"Sql Server\u65e5\u671f\u6642\u9593\u51fd\u6578"},"content":{"rendered":"

SQL Server \u65e5\u671f\u6642\u9593\u51fd\u6578<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u662f\u5728\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u6642\u3002SQL Server \u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u65e5\u671f\u6642\u9593\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u548c\u64cd\u4f5c\u65e5\u671f\u6642\u9593\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39 SQL Server \u4e2d\u5e38\u7528\u7684\u65e5\u671f\u6642\u9593\u51fd\u6578\u53ca\u5176\u61c9\u7528\u3002<\/p>\n

1. \u4e3b\u8981\u65e5\u671f\u6642\u9593\u51fd\u6578<\/h2>\n

1.1 GETDATE()<\/h3>\n

GETDATE() \u51fd\u6578\u7528\u65bc\u7372\u53d6\u7576\u524d\u7684\u7cfb\u7d71\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u500b\u51fd\u6578\u4e0d\u9700\u8981\u4efb\u4f55\u53c3\u6578\uff0c\u8fd4\u56de\u7684\u7d50\u679c\u662f\u4e00\u500b datetime \u985e\u578b\u7684\u503c\u3002<\/p>\n

SELECT GETDATE() AS CurrentDateTime;<\/code><\/pre>\n
1.2 SYSDATETIME()<\/h3>\n
SYSDATETIME() \u51fd\u6578\u8207 GETDATE() \u985e\u4f3c\uff0c\u4f46\u5b83\u8fd4\u56de\u7684\u7cbe\u5ea6\u66f4\u9ad8\uff0c\u80fd\u5920\u63d0\u4f9b\u7d0d\u79d2\u7d1a\u7684\u6642\u9593\u3002<\/p>\n
SELECT SYSDATETIME() AS CurrentDateTime;<\/code><\/pre>\n
1.3 DATEADD()<\/h3>\n
DATEADD() \u51fd\u6578\u7528\u65bc\u5728\u6307\u5b9a\u7684\u65e5\u671f\u4e0a\u6dfb\u52a0\u4e00\u6bb5\u6642\u9593\u3002\u5b83\u9700\u8981\u4e09\u500b\u53c3\u6578\uff1a\u6642\u9593\u55ae\u4f4d\u3001\u8981\u6dfb\u52a0\u7684\u6578\u91cf\u548c\u57fa\u6e96\u65e5\u671f\u3002<\/p>\n
SELECT DATEADD(DAY, 5, GETDATE()) AS NewDate;<\/code><\/pre>\n
\u4e0a\u8ff0\u4f8b\u5b50\u5c07\u7576\u524d\u65e5\u671f\u52a0\u4e0a 5 \u5929\u3002<\/p>\n
1.4 DATEDIFF()<\/h3>\n
DATEDIFF() \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u5b83\u7684\u53c3\u6578\u5305\u62ec\u6642\u9593\u55ae\u4f4d\u3001\u958b\u59cb\u65e5\u671f\u548c\u7d50\u675f\u65e5\u671f\u3002<\/p>\n
SELECT DATEDIFF(DAY, '2023-01-01', GETDATE()) AS DaysDifference;<\/code><\/pre>\n
\u9019\u500b\u4f8b\u5b50\u8a08\u7b97\u5f9e 2023 \u5e74 1 \u6708 1 \u65e5\u5230\u7576\u524d\u65e5\u671f\u7684\u5929\u6578\u5dee\u7570\u3002<\/p>\n
1.5 FORMAT()<\/h3>\n
FORMAT() \u51fd\u6578\u7528\u65bc\u683c\u5f0f\u5316\u65e5\u671f\u6642\u9593\u7684\u986f\u793a\u65b9\u5f0f\u3002\u5b83\u53ef\u4ee5\u6839\u64da\u6307\u5b9a\u7684\u683c\u5f0f\u5b57\u7b26\u4e32\u8fd4\u56de\u65e5\u671f\u6642\u9593\u7684\u683c\u5f0f\u5316\u7d50\u679c\u3002<\/p>\n
SELECT FORMAT(GETDATE(), 'yyyy-MM-dd HH:mm:ss') AS FormattedDateTime;<\/code><\/pre>\n
\u9019\u500b\u4f8b\u5b50\u5c07\u7576\u524d\u65e5\u671f\u6642\u9593\u683c\u5f0f\u5316\u70ba ‘\u5e74-\u6708-\u65e5 \u6642:\u5206:\u79d2’ \u7684\u5f62\u5f0f\u3002<\/p>\n
2. \u65e5\u671f\u6642\u9593\u7684\u8f49\u63db<\/h2>\n
2.1 CONVERT()<\/h3>\n
CONVERT() \u51fd\u6578\u7528\u65bc\u5c07\u4e00\u500b\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u6578\u64da\u985e\u578b\uff0c\u7279\u5225\u662f\u5728\u65e5\u671f\u6642\u9593\u7684\u683c\u5f0f\u8f49\u63db\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n
SELECT CONVERT(VARCHAR, GETDATE(), 120) AS ConvertedDateTime;<\/code><\/pre>\n
\u9019\u500b\u4f8b\u5b50\u5c07\u7576\u524d\u65e5\u671f\u6642\u9593\u8f49\u63db\u70ba ‘yyyy-mm-dd hh:mi:ss’ \u7684\u683c\u5f0f\u3002<\/p>\n
2.2 CAST()<\/h3>\n
CAST() \u51fd\u6578\u4e5f\u53ef\u4ee5\u7528\u65bc\u985e\u578b\u8f49\u63db\uff0c\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\uff0c\u9069\u5408\u7528\u65bc\u7c21\u55ae\u7684\u985e\u578b\u8f49\u63db\u3002<\/p>\n
SELECT CAST(GETDATE() AS DATE) AS CurrentDate;<\/code><\/pre>\n
\u9019\u500b\u4f8b\u5b50\u5c07\u7576\u524d\u7684\u65e5\u671f\u6642\u9593\u8f49\u63db\u70ba\u50c5\u5305\u542b\u65e5\u671f\u7684\u683c\u5f0f\u3002<\/p>\n
3. \u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n
\u5728\u5be6\u969b\u7684\u696d\u52d9\u5834\u666f\u4e2d\uff0c\u65e5\u671f\u6642\u9593\u51fd\u6578\u7684\u61c9\u7528\u975e\u5e38\u5ee3\u6cdb\u3002\u4f8b\u5982\uff0c\u5728\u5831\u544a\u4e2d\u9700\u8981\u8a08\u7b97\u67d0\u6bb5\u6642\u9593\u5167\u7684\u92b7\u552e\u984d\uff0c\u6216\u8005\u5728\u7528\u6236\u8a3b\u518a\u6642\u8a18\u9304\u8a3b\u518a\u6642\u9593\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u793a\u4f8b\uff0c\u986f\u793a\u904e\u53bb\u4e00\u5468\u7684\u92b7\u552e\u8a18\u9304\uff1a<\/p>\n
SELECT * FROM Sales\nWHERE SaleDate >= DATEADD(WEEK, -1, GETDATE());<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u6642\u9593\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u65e5\u671f\u6642\u9593\u6578\u64da\u3002\u7121\u8ad6\u662f\u7372\u53d6\u7576\u524d\u6642\u9593\u3001\u8a08\u7b97\u65e5\u671f\u5dee\u7570\uff0c\u9084\u662f\u683c\u5f0f\u5316\u65e5\u671f\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6578\u64da\u5206\u6790\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 \u9999\u6e2f 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\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 \u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22SQL Server\u4e2d\u7684\u65e5\u671f\u6642\u9593\u51fd\u6578\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u8655\u7406\u548c\u64cd\u4f5c\u65e5\u671f\u8207\u6642\u9593\u6578\u64da\u4ee5\u63d0\u5347\u6578\u64da\u5eab\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-139009","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139009","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=139009"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139009\/revisions"}],"predecessor-version":[{"id":139010,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139009\/revisions\/139010"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}