{"id":143833,"date":"2024-11-01T01:38:19","date_gmt":"2024-10-31T17:38:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143833\/"},"modified":"2024-11-01T01:38:20","modified_gmt":"2024-10-31T17:38:20","slug":"sql-%e8%a8%88%e7%ae%97%e5%b9%b4%e9%bd%a1%e6%96%b9%e6%b3%95%e5%a4%a7%e5%85%a8-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%88%e7%ae%97%e5%b9%b4%e9%bd%a1%e7%9a%84%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143833\/","title":{"rendered":"SQL \u8a08\u7b97\u5e74\u9f61\u65b9\u6cd5\u5927\u5168 (\u6578\u64da\u5eab\u8a08\u7b97\u5e74\u9f61\u7684\u8a9e\u53e5)"},"content":{"rendered":"

SQL \u8a08\u7b97\u5e74\u9f61\u65b9\u6cd5\u5927\u5168 (\u6578\u64da\u5eab\u8a08\u7b97\u5e74\u9f61\u7684\u8a9e\u53e5)<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u8a08\u7b97\u5e74\u9f61\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u7528\u6236\u8cc7\u6599\u3001\u6703\u54e1\u7cfb\u7d71\u6216\u4efb\u4f55\u9700\u8981\u6839\u64da\u51fa\u751f\u65e5\u671f\u8a08\u7b97\u5e74\u9f61\u7684\u61c9\u7528\u5834\u666f\u4e2d\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5728 SQL \u4e2d\u8a08\u7b97\u5e74\u9f61\u7684\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u8a9e\u53e5\u793a\u4f8b\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u8655\u7406\u3002<\/p>\n

\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5e74\u9f61\u7684\u8a08\u7b97\u901a\u5e38\u57fa\u65bc\u7528\u6236\u7684\u51fa\u751f\u65e5\u671f\u3002\u6839\u64da\u7576\u524d\u65e5\u671f\u8207\u51fa\u751f\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\uff0c\u6211\u5011\u53ef\u4ee5\u5f97\u51fa\u7528\u6236\u7684\u5e74\u9f61\u3002SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u8f15\u9b06\u8a08\u7b97\u5e74\u9f61\u3002<\/p>\n

\u4f7f\u7528 DATEDIFF \u51fd\u6578<\/h2>\n

\u5728 MySQL \u4e2d\uff0cDATEDIFF<\/code> \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\u3002\u901a\u904e\u5c07\u5929\u6578\u9664\u4ee5 365\uff0c\u6211\u5011\u53ef\u4ee5\u5f97\u5230\u5927\u81f4\u7684\u5e74\u9f61\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 DATEDIFF<\/code> \u51fd\u6578\u8a08\u7b97\u5e74\u9f61\u7684\u793a\u4f8b\uff1a<\/p>\n

SELECT \n    name, \n    birth_date, \n    FLOOR(DATEDIFF(CURDATE(), birth_date) \/ 365) AS age \nFROM \n    users;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cCURDATE()<\/code> \u51fd\u6578\u8fd4\u56de\u7576\u524d\u65e5\u671f\uff0c\u800c birth_date<\/code> \u662f\u7528\u6236\u7684\u51fa\u751f\u65e5\u671f\u3002FLOOR<\/code> \u51fd\u6578\u7528\u4f86\u53d6\u6574\uff0c\u78ba\u4fdd\u5e74\u9f61\u662f\u6574\u6578\u3002<\/p>\n
\u4f7f\u7528 TIMESTAMPDIFF \u51fd\u6578<\/h2>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528 TIMESTAMPDIFF<\/code> \u51fd\u6578\uff0c\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u76f4\u63a5\u8a08\u7b97\u5169\u500b\u6642\u9593\u6233\u4e4b\u9593\u7684\u5dee\u7570\uff0c\u4e26\u4ee5\u6307\u5b9a\u7684\u55ae\u4f4d\u8fd4\u56de\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 TIMESTAMPDIFF<\/code> \u8a08\u7b97\u5e74\u9f61\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT \n    name, \n    birth_date, \n    TIMESTAMPDIFF(YEAR, birth_date, CURDATE()) AS age \nFROM \n    users;<\/code><\/pre>\n
\u9019\u88e1\uff0cTIMESTAMPDIFF(YEAR, birth_date, CURDATE())<\/code> \u76f4\u63a5\u8fd4\u56de\u7528\u6236\u7684\u5e74\u9f61\uff0c\u9019\u7a2e\u65b9\u6cd5\u66f4\u52a0\u7c21\u6f54\u660e\u4e86\u3002<\/p>\n
\u4f7f\u7528 EXTRACT \u51fd\u6578<\/h2>\n
\u5728 PostgreSQL \u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 EXTRACT<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u65e5\u671f\u7684\u5404\u500b\u90e8\u5206\u3002\u4ee5\u4e0b\u662f\u8a08\u7b97\u5e74\u9f61\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT \n    name, \n    birth_date, \n    EXTRACT(YEAR FROM AGE(birth_date)) AS age \nFROM \n    users;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cAGE(birth_date)<\/code> \u51fd\u6578\u8a08\u7b97\u7576\u524d\u65e5\u671f\u8207\u51fa\u751f\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\uff0c\u7136\u5f8c EXTRACT(YEAR FROM ...)<\/code> \u63d0\u53d6\u51fa\u5e74\u9f61\u3002<\/p>\n
\u8003\u616e\u958f\u5e74<\/h2>\n
\u5728\u8a08\u7b97\u5e74\u9f61\u6642\uff0c\u958f\u5e74\u53ef\u80fd\u6703\u5f71\u97ff\u7d50\u679c\u3002\u70ba\u4e86\u66f4\u6e96\u78ba\u5730\u8a08\u7b97\u5e74\u9f61\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 DATE_FORMAT<\/code> \u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u683c\u5f0f\uff0c\u78ba\u4fdd\u5728\u8a08\u7b97\u6642\u4e0d\u6703\u56e0\u70ba\u958f\u5e74\u800c\u51fa\u73fe\u8aa4\u5dee\u3002<\/p>\n
SELECT \n    name, \n    birth_date, \n    TIMESTAMPDIFF(YEAR, birth_date, CURDATE()) - \n    (DATE_FORMAT(CURDATE(), '%m%d') < DATE_FORMAT(birth_date, '%m%d')) AS age \nFROM \n    users;<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u901a\u904e\u6bd4\u8f03\u7576\u524d\u65e5\u671f\u548c\u51fa\u751f\u65e5\u671f\u7684\u6708\u4efd\u548c\u65e5\u671f\uff0c\u4f86\u8abf\u6574\u5e74\u9f61\u7684\u8a08\u7b97\uff0c\u5f9e\u800c\u8003\u616e\u958f\u5e74\u7684\u5f71\u97ff\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u8a08\u7b97\u5e74\u9f61\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u529f\u80fd\uff0c\u7121\u8ad6\u662f\u4f7f\u7528 MySQL \u9084\u662f PostgreSQL\uff0c\u90fd\u6709\u591a\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u5be6\u73fe\u3002\u901a\u904e\u4f7f\u7528 DATEDIFF<\/code>\u3001TIMESTAMPDIFF<\/code> \u548c EXTRACT<\/code> \u7b49\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u5f0f\u4f86\u8a08\u7b97\u5e74\u9f61\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22 SQL \u4e2d\u8a08\u7b97\u5e74\u9f61\u7684\u5404\u7a2e\u65b9\u6cd5\uff0c\u638c\u63e1\u6578\u64da\u5eab\u4e2d\u5e74\u9f61\u8a08\u7b97\u7684\u8a9e\u53e5\u8207\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u80fd\u529b\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-143833","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143833","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=143833"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143833\/revisions"}],"predecessor-version":[{"id":143834,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143833\/revisions\/143834"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}