{"id":168003,"date":"2024-11-06T08:42:21","date_gmt":"2024-11-06T00:42:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168003\/"},"modified":"2024-11-06T08:42:22","modified_gmt":"2024-11-06T00:42:22","slug":"%e8%81%8a%e8%81%8asql%e4%b8%ad%e7%9a%84%e9%ab%98%e7%b4%9a%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168003\/","title":{"rendered":"\u804a\u804aSQL\u4e2d\u7684\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578"},"content":{"rendered":"

\u804a\u804aSQL\u4e2d\u7684\u9ad8\u7d1a\u65e5\u671f\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\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u63d0\u4f9b\u4e86\u591a\u7a2e\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u548c\u67e5\u8a62\u65e5\u671f\u6642\u9593\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5e38\u7528\u7684\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578\u53ca\u5176\u61c9\u7528\u3002<\/p>\n

1. DATEADD \u51fd\u6578<\/h2>\n

DATEADD \u51fd\u6578\u7528\u65bc\u5728\u6307\u5b9a\u7684\u65e5\u671f\u4e0a\u6dfb\u52a0\u4e00\u6bb5\u6642\u9593\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

DATEADD(datepart, number, date)<\/code><\/pre>\n
\u5176\u4e2d\uff0cdatepart<\/code> \u53ef\u4ee5\u662f\u5e74\u3001\u6708\u3001\u65e5\u7b49\uff0cnumber<\/code> \u662f\u8981\u6dfb\u52a0\u7684\u6578\u91cf\uff0cdate<\/code> \u662f\u57fa\u6e96\u65e5\u671f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u7576\u524d\u65e5\u671f\u4e0a\u6dfb\u52a0 10 \u5929\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT DATEADD(DAY, 10, GETDATE()) AS NewDate;<\/code><\/pre>\n
2. DATEDIFF \u51fd\u6578<\/h2>\n
DATEDIFF \u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
DATEDIFF(datepart, startdate, enddate)<\/code><\/pre>\n
\u9019\u88e1\u7684 datepart<\/code> \u540c\u6a23\u53ef\u4ee5\u662f\u5e74\u3001\u6708\u3001\u65e5\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u8a08\u7b97\u4eca\u5929\u8207\u67d0\u500b\u7279\u5b9a\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\uff1a<\/p>\n
SELECT DATEDIFF(DAY, '2023-01-01', GETDATE()) AS DaysDifference;<\/code><\/pre>\n
3. FORMAT \u51fd\u6578<\/h2>\n
FORMAT \u51fd\u6578\u7528\u65bc\u683c\u5f0f\u5316\u65e5\u671f\u548c\u6642\u9593\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
FORMAT(value, format_string)<\/code><\/pre>\n
\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5c07\u65e5\u671f\u8f49\u63db\u70ba\u6307\u5b9a\u7684\u683c\u5f0f\u3002\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u683c\u5f0f\u5316\u70ba ‘YYYY-MM-DD’ \u7684\u5f62\u5f0f\uff1a<\/p>\n
SELECT FORMAT(GETDATE(), 'yyyy-MM-dd') AS FormattedDate;<\/code><\/pre>\n
4. EOMONTH \u51fd\u6578<\/h2>\n
EOMONTH \u51fd\u6578\u7528\u65bc\u8fd4\u56de\u6307\u5b9a\u65e5\u671f\u6240\u5728\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
EOMONTH(start_date, month_to_add)<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u7372\u53d6\u7576\u524d\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT EOMONTH(GETDATE()) AS EndOfMonth;<\/code><\/pre>\n
5. YEAR, MONTH, DAY \u51fd\u6578<\/h2>\n
\u9019\u4e9b\u51fd\u6578\u5206\u5225\u7528\u65bc\u63d0\u53d6\u65e5\u671f\u7684\u5e74\u4efd\u3001\u6708\u4efd\u548c\u65e5\u671f\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
YEAR(date), MONTH(date), DAY(date)<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u7576\u524d\u65e5\u671f\u4e2d\u63d0\u53d6\u5e74\u4efd\u3001\u6708\u4efd\u548c\u65e5\u671f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT YEAR(GETDATE()) AS CurrentYear, MONTH(GETDATE()) AS CurrentMonth, DAY(GETDATE()) AS CurrentDay;<\/code><\/pre>\n
6. \u4f7f\u7528\u6848\u4f8b<\/h2>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u9019\u4e9b\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u5834\u666f\uff0c\u4f8b\u5982\u751f\u6210\u5831\u544a\u3001\u5206\u6790\u92b7\u552e\u6578\u64da\u3001\u8a08\u7b97\u7528\u6236\u6d3b\u8e8d\u5ea6\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7d9c\u5408\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u591a\u500b\u65e5\u671f\u51fd\u6578\u4f86\u5206\u6790\u67d0\u500b\u6642\u9593\u7bc4\u570d\u5167\u7684\u92b7\u552e\u6578\u64da\uff1a<\/p>\n
\nSELECT \n    COUNT(*) AS TotalSales,\n    SUM(Amount) AS TotalAmount,\n    FORMAT(OrderDate, 'yyyy-MM') AS SalesMonth\nFROM \n    Sales\nWHERE \n    OrderDate BETWEEN DATEADD(MONTH, -6, GETDATE()) AND GETDATE()\nGROUP BY \n    FORMAT(OrderDate, 'yyyy-MM');\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578\u5728 SQL \u4e2d\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u66f4\u9748\u6d3b\u5730\u8655\u7406\u548c\u5206\u6790\u65e5\u671f\u6642\u9593\u6578\u64da\u3002\u7121\u8ad6\u662f\u8a08\u7b97\u65e5\u671f\u5dee\u7570\u3001\u683c\u5f0f\u5316\u65e5\u671f\uff0c\u9084\u662f\u7372\u53d6\u7279\u5b9a\u65e5\u671f\u7684\u6700\u5f8c\u4e00\u5929\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u986f\u8457\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6578\u64da\u5206\u6790\u7684\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u4f86\u8aaa\uff0c\u719f\u6089\u9019\u4e9b\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u7db2\u7ad9\u6258\u7ba1\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\uff0c\u6211\u5011\u7684 \u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22SQL\u4e2d\u7684\u9ad8\u7d1a\u65e5\u671f\u51fd\u6578\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u548c\u5206\u6790\u7684\u6548\u7387\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-168003","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168003","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=168003"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168003\/revisions"}],"predecessor-version":[{"id":168004,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168003\/revisions\/168004"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}