{"id":99462,"date":"2024-10-21T11:18:16","date_gmt":"2024-10-21T03:18:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/99462\/"},"modified":"2024-10-21T11:18:17","modified_gmt":"2024-10-21T03:18:17","slug":"mysql%e6%8c%87%e4%bb%a4-year%ef%bc%88%e5%b9%b4%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/99462\/","title":{"rendered":"MySQL\u6307\u4ee4: YEAR\uff08\u5e74\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-year%ef%bc%88%e5%b9%b4%ef%bc%89-dOdmHmjOln\">MySQL\u6307\u4ee4: YEAR\uff08\u5e74\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u548c\u5206\u6790\u6578\u64da\uff0c\u5176\u4e2d\u5305\u62ec\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684YEAR()\u51fd\u6578\uff0c\u9019\u662f\u4e00\u500b\u7528\u65bc\u63d0\u53d6\u65e5\u671f\u4e2d\u7684\u5e74\u4efd\u7684\u6307\u4ee4\u3002<\/p>\n<h2 id=\"year%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-dOdmHmjOln\">YEAR()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>YEAR()\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5f9e\u65e5\u671f\u6216\u65e5\u671f\u6642\u9593\u503c\u4e2d\u63d0\u53d6\u51fa\u5e74\u4efd\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6642\u9593\u5e8f\u5217\u5206\u6790\u6216\u5831\u544a\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\u975e\u5e38\u6709\u7528\u3002YEAR()\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>YEAR(date)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>date<\/code>\u53ef\u4ee5\u662f\u65e5\u671f\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u6642\u9593\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\uff0c\u6216\u662fMySQL\u7684\u65e5\u671f\u985e\u578b\u5b57\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-dOdmHmjOln\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528YEAR()\u51fd\u6578\u7684\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u5176\u7528\u6cd5\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1-%e6%8f%90%e5%8f%96%e5%b9%b4%e4%bb%bd-dOdmHmjOln\">\u7bc4\u4f8b1: \u63d0\u53d6\u5e74\u4efd<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>orders<\/code>\u7684\u8868\u683c\uff0c\u8a72\u8868\u683c\u5305\u542b\u4e00\u500b<code>order_date<\/code>\u5b57\u6bb5\uff0c\u8a18\u9304\u4e86\u6bcf\u500b\u8a02\u55ae\u7684\u65e5\u671f\u3002\u8981\u63d0\u53d6\u6240\u6709\u8a02\u55ae\u7684\u5e74\u4efd\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT YEAR(order_date) AS order_year FROM orders;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u4e00\u500b\u5305\u542b\u6240\u6709\u8a02\u55ae\u5e74\u4efd\u7684\u7d50\u679c\u96c6\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2-%e6%8c%89%e5%b9%b4%e4%bb%bd%e5%88%86%e7%b5%84-dOdmHmjOln\">\u7bc4\u4f8b2: \u6309\u5e74\u4efd\u5206\u7d44<\/h3>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u6309\u5e74\u4efd\u7d71\u8a08\u8a02\u55ae\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528GROUP BY\u5b50\u53e5\uff1a<\/p>\n<pre><code>SELECT YEAR(order_date) AS order_year, COUNT(*) AS total_orders \nFROM orders \nGROUP BY order_year;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6bcf\u500b\u5e74\u4efd\u7684\u8a02\u55ae\u6578\u91cf\uff0c\u5e6b\u52a9\u60a8\u5206\u6790\u4e0d\u540c\u5e74\u4efd\u7684\u696d\u52d9\u8868\u73fe\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3-%e9%81%8e%e6%bf%be%e7%89%b9%e5%ae%9a%e5%b9%b4%e4%bb%bd%e7%9a%84%e6%95%b8%e6%93%9a-dOdmHmjOln\">\u7bc4\u4f8b3: \u904e\u6ffe\u7279\u5b9a\u5e74\u4efd\u7684\u6578\u64da<\/h3>\n<p>\u5982\u679c\u60a8\u53ea\u60f3\u67e5\u8a62\u7279\u5b9a\u5e74\u4efd\u7684\u8a02\u55ae\uff0c\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u4f86\u904e\u6ffe\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT * FROM orders \nWHERE YEAR(order_date) = 2022;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u57282022\u5e74\u4e0b\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-dOdmHmjOln\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528YEAR()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u50b3\u5165\u7684\u65e5\u671f\u503c\u70baNULL\uff0c\u5247YEAR()\u51fd\u6578\u5c07\u8fd4\u56deNULL\u3002<\/li>\n<li>YEAR()\u51fd\u6578\u50c5\u9069\u7528\u65bc\u65e5\u671f\u548c\u65e5\u671f\u6642\u9593\u985e\u578b\u7684\u6578\u64da\uff0c\u5c0d\u65bc\u5b57\u7b26\u4e32\u985e\u578b\u7684\u65e5\u671f\uff0c\u9700\u78ba\u4fdd\u5176\u683c\u5f0f\u6b63\u78ba\u3002<\/li>\n<li>\u5728\u9032\u884c\u65e5\u671f\u8a08\u7b97\u6642\uff0c\u5efa\u8b70\u4f7f\u7528MySQL\u7684\u65e5\u671f\u51fd\u6578\u4f86\u78ba\u4fdd\u6e96\u78ba\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-dOdmHmjOln\">\u7d50\u8ad6<\/h2>\n<p>YEAR()\u51fd\u6578\u5728MySQL\u4e2d\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u63d0\u53d6\u548c\u5206\u6790\u65e5\u671f\u4e2d\u7684\u5e74\u4efd\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u7d71\u8a08\u9084\u662f\u6642\u9593\u5e8f\u5217\u5206\u6790\uff0c\u638c\u63e1YEAR()\u51fd\u6578\u7684\u4f7f\u7528\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u4e14\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\u3002\u900f\u904e\u6211\u5011\u7684\u670d\u52d9\uff0c\u60a8\u53ef\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\uff0c\u8b93\u60a8\u7684\u696d\u52d9\u904b\u884c\u66f4\u52a0\u9806\u5229\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4YEAR\uff0c\u8f7b\u677e\u63d0\u53d6\u65e5\u671f\u4e2d\u7684\u5e74\u4efd\uff0c\u63d0\u5347\u6570\u636e\u5904\u7406\u6548\u7387\uff0c\u4f18\u5316\u6570\u636e\u5e93\u67e5\u8be2\u4e0e\u5206\u6790\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-99462","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/99462","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=99462"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/99462\/revisions"}],"predecessor-version":[{"id":99463,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/99462\/revisions\/99463"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=99462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=99462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=99462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}