{"id":66271,"date":"2024-10-14T16:01:28","date_gmt":"2024-10-14T08:01:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66271\/"},"modified":"2024-10-14T16:01:28","modified_gmt":"2024-10-14T08:01:28","slug":"mssql%e4%b8%8b%e4%b9%9d%e5%80%8b%e6%99%82%e9%96%93%e6%a2%9d%e4%bb%b6%e7%9a%84%e9%81%8b%e7%94%a8%ef%bc%88mssql%e6%99%82%e9%96%93%e6%a2%9d%e4%bb%b6%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66271\/","title":{"rendered":"MSSQL\u4e0b\u4e5d\u500b\u6642\u9593\u689d\u4ef6\u7684\u904b\u7528\uff08mssql\u6642\u9593\u689d\u4ef6\uff09"},"content":{"rendered":"

MSSQL\u4e0b\u4e5d\u500b\u6642\u9593\u689d\u4ef6\u7684\u904b\u7528\uff08mssql\u6642\u9593\u689d\u4ef6\uff09<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u6642\u9593\u689d\u4ef6\u7684\u904b\u7528\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528 Microsoft SQL Server (MSSQL) \u6642\u3002\u6642\u9593\u689d\u4ef6\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u7be9\u9078\u6578\u64da\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e5d\u500b\u5e38\u898b\u7684 MSSQL \u6642\u9593\u689d\u4ef6\u53ca\u5176\u904b\u7528\u65b9\u5f0f\u3002<\/p>\n

1. BETWEEN<\/h2>\n

BETWEEN \u95dc\u9375\u5b57\u7528\u65bc\u7be9\u9078\u5728\u7279\u5b9a\u7bc4\u570d\u5167\u7684\u65e5\u671f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62 2023 \u5e74 1 \u6708 1 \u65e5\u81f3 2023 \u5e74 12 \u6708 31 \u65e5\u4e4b\u9593\u7684\u6240\u6709\u8a02\u55ae\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n

SELECT * FROM Orders WHERE OrderDate BETWEEN '2023-01-01' AND '2023-12-31';<\/code><\/pre>\n
2. DATEADD<\/h2>\n
DATEADD \u51fd\u6578\u7528\u65bc\u5728\u65e5\u671f\u4e0a\u52a0\u4e0a\u6307\u5b9a\u7684\u6642\u9593\u9593\u9694\u3002\u9019\u5c0d\u65bc\u67e5\u8a62\u6700\u8fd1\u7684\u6578\u64da\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u904e\u53bb 30 \u5929\u7684\u8a02\u55ae\uff1a<\/p>\n
SELECT * FROM Orders WHERE OrderDate >= DATEADD(DAY, -30, GETDATE());<\/code><\/pre>\n
3. DATEDIFF<\/h2>\n
DATEDIFF \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u9019\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u4e86\u89e3\u67d0\u4e9b\u4e8b\u4ef6\u7684\u6642\u9593\u9593\u9694\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u4e0b\u55ae\u6642\u9593\u8ddd\u4eca\u8d85\u904e 7 \u5929\u7684\u8a02\u55ae\uff1a<\/p>\n
SELECT * FROM Orders WHERE DATEDIFF(DAY, OrderDate, GETDATE()) > 7;<\/code><\/pre>\n
4. GETDATE<\/h2>\n
GETDATE \u51fd\u6578\u8fd4\u56de\u7576\u524d\u7684\u7cfb\u7d71\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u5728\u9700\u8981\u57fa\u65bc\u7576\u524d\u6642\u9593\u9032\u884c\u67e5\u8a62\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u4eca\u5929\u7684\u6240\u6709\u8a02\u55ae\uff1a<\/p>\n
SELECT * FROM Orders WHERE CAST(OrderDate AS DATE) = CAST(GETDATE() AS DATE);<\/code><\/pre>\n
5. YEAR, MONTH, DAY<\/h2>\n
\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u63d0\u53d6\u65e5\u671f\u7684\u5e74\u3001\u6708\u3001\u65e5\u90e8\u5206\u3002\u9019\u5c0d\u65bc\u6309\u5e74\u6216\u6309\u6708\u9032\u884c\u5206\u7d44\u67e5\u8a62\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u67e5\u8a62 2023 \u5e74\u7684\u6240\u6709\u8a02\u55ae\uff1a<\/p>\n
SELECT * FROM Orders WHERE YEAR(OrderDate) = 2023;<\/code><\/pre>\n
6. FORMAT<\/h2>\n
FORMAT \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u683c\u5f0f\u5316\u65e5\u671f\u3002\u9019\u5728\u9700\u8981\u7279\u5b9a\u683c\u5f0f\u7684\u5831\u544a\u4e2d\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5c07\u65e5\u671f\u683c\u5f0f\u5316\u70ba ‘YYYY-MM-DD’\uff1a<\/p>\n
SELECT FORMAT(OrderDate, 'yyyy-MM-dd') AS FormattedDate FROM Orders;<\/code><\/pre>\n
7. EOMONTH<\/h2>\n
EOMONTH \u51fd\u6578\u8fd4\u56de\u6307\u5b9a\u65e5\u671f\u6240\u5728\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002\u9019\u5c0d\u65bc\u6708\u672b\u5831\u544a\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u67e5\u8a62 2023 \u5e74 1 \u6708\u7684\u6700\u5f8c\u4e00\u5929\uff1a<\/p>\n
SELECT EOMONTH('2023-01-01') AS EndOfMonth;<\/code><\/pre>\n
8. ISDATE<\/h2>\n
ISDATE \u51fd\u6578\u7528\u65bc\u6aa2\u67e5\u4e00\u500b\u503c\u662f\u5426\u70ba\u6709\u6548\u7684\u65e5\u671f\u3002\u9019\u5728\u8655\u7406\u7528\u6236\u8f38\u5165\u6642\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u6aa2\u67e5\u67d0\u500b\u5b57\u6bb5\u662f\u5426\u70ba\u6709\u6548\u65e5\u671f\uff1a<\/p>\n
SELECT * FROM Orders WHERE ISDATE(OrderDate) = 1;<\/code><\/pre>\n
9. CONVERT<\/h2>\n
CONVERT \u51fd\u6578\u7528\u65bc\u5c07\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\u3002\u9019\u5728\u9700\u8981\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u65e5\u671f\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u65e5\u671f\uff1a<\/p>\n
SELECT CONVERT(DATE, '2023-01-01') AS ConvertedDate;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u4ee5\u4e0a\u4e5d\u500b MSSQL \u6642\u9593\u689d\u4ef6\u7684\u904b\u7528\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u7ba1\u7406\u3002\u900f\u904e\u9019\u4e9b\u51fd\u6578\u548c\u689d\u4ef6\uff0c\u6211\u5011\u53ef\u4ee5\u9748\u6d3b\u5730\u8655\u7406\u6642\u9593\u76f8\u95dc\u7684\u6578\u64da\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u3002\u82e5\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u8b93\u60a8\u7684\u6578\u64da\u5eab\u904b\u884c\u66f4\u52a0\u6d41\u66a2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22MSSQL\u4e2d\u4e5d\u500b\u6642\u9593\u689d\u4ef6\u7684\u61c9\u7528\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u7ba1\u7406\uff0c\u52a9\u4f60\u8f15\u9b06\u8655\u7406\u6642\u9593\u76f8\u95dc\u6578\u64da\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-66271","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66271","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=66271"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66271\/revisions"}],"predecessor-version":[{"id":66272,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66271\/revisions\/66272"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}