{"id":79564,"date":"2024-10-16T13:19:35","date_gmt":"2024-10-16T05:19:35","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79564\/"},"modified":"2024-10-16T13:19:35","modified_gmt":"2024-10-16T05:19:35","slug":"mysql%e6%8c%87%e4%bb%a4-right%ef%bc%88%e5%8f%b3%e6%88%aa%e5%8f%96%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79564\/","title":{"rendered":"MySQL\u6307\u4ee4: RIGHT()\uff08\u53f3\u622a\u53d6\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-right%ef%bc%88%e5%8f%b3%e6%88%aa%e5%8f%96%ef%bc%89-ZiUQBMMiAH\">MySQL\u6307\u4ee4: RIGHT()\uff08\u53f3\u622a\u53d6\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u5f37\u5927\u7684\u6307\u4ee4\u4f86\u8655\u7406\u548c\u64cd\u4f5c\u8cc7\u6599\u3002\u5176\u4e2d\uff0cRIGHT()\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5b57\u7b26\u4e32\u8655\u7406\u51fd\u6578\uff0c\u80fd\u5920\u5f9e\u4e00\u500b\u5b57\u7b26\u4e32\u7684\u53f3\u5074\u622a\u53d6\u6307\u5b9a\u6578\u91cf\u7684\u5b57\u7b26\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eRIGHT()\u51fd\u6578\u7684\u7528\u6cd5\u53ca\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"right%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-ZiUQBMMiAH\">RIGHT()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>RIGHT()\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>RIGHT(string, length)<\/code><\/pre>\n<ul>\n<li><strong>string<\/strong>: \u9700\u8981\u9032\u884c\u622a\u53d6\u7684\u539f\u59cb\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong>length<\/strong>: \u5f9e\u53f3\u5074\u622a\u53d6\u7684\u5b57\u7b26\u6578\u91cf\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u5b57\u7b26\u4e32\u201cHello World\u201d\uff0c\u4e26\u5e0c\u671b\u5f9e\u4e2d\u622a\u53d6\u6700\u5f8c5\u500b\u5b57\u7b26\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>SELECT RIGHT('Hello World', 5);<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u201cWorld\u201d\u3002<\/p>\n<h2 id=\"right%e5%87%bd%e6%95%b8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-ZiUQBMMiAH\">RIGHT()\u51fd\u6578\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>RIGHT()\u51fd\u6578\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<h3 id=\"1-%e8%99%95%e7%90%86%e7%94%a8%e6%88%b6%e8%bc%b8%e5%85%a5%e7%9a%84%e6%95%b8%e6%93%9a-ZiUQBMMiAH\">1. \u8655\u7406\u7528\u6236\u8f38\u5165\u7684\u6578\u64da<\/h3>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u7528\u6236\u53ef\u80fd\u6703\u8f38\u5165\u5305\u542b\u591a\u500b\u90e8\u5206\u7684\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u6216\u96fb\u8a71\u865f\u78bc\u3002\u4f7f\u7528RIGHT()\u51fd\u6578\u53ef\u4ee5\u8f15\u9b06\u63d0\u53d6\u51fa\u7279\u5b9a\u90e8\u5206\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5f9e\u96fb\u8a71\u865f\u78bc\u4e2d\u63d0\u53d6\u5340\u57df\u78bc\uff1a<\/p>\n<pre><code>SELECT RIGHT(phone_number, 4) AS last_four_digits FROM users;<\/code><\/pre>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-ZiUQBMMiAH\">2. \u6578\u64da\u6e05\u7406<\/h3>\n<p>\u5728\u6578\u64da\u6e05\u7406\u904e\u7a0b\u4e2d\uff0cRIGHT()\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5f9e\u4e0d\u898f\u5247\u7684\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u5f9e\u4e00\u7d44\u5305\u542b\u65e5\u671f\u7684\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5e74\u4efd\uff1a<\/p>\n<pre><code>SELECT RIGHT(date_column, 4) AS year FROM events;<\/code><\/pre>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e5%a0%b1%e5%91%8a-ZiUQBMMiAH\">3. \u6578\u64da\u5831\u544a<\/h3>\n<p>\u5728\u751f\u6210\u5831\u544a\u6642\uff0cRIGHT()\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u683c\u5f0f\u5316\u8f38\u51fa\u3002\u4f8b\u5982\uff0c\u5f9e\u7522\u54c1\u7de8\u865f\u4e2d\u63d0\u53d6\u6700\u5f8c\u7684\u8b58\u5225\u78bc\uff1a<\/p>\n<pre><code>SELECT RIGHT(product_id, 3) AS identifier FROM products;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-ZiUQBMMiAH\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u4f7f\u7528RIGHT()\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u6307\u5b9a\u7684length\u5927\u65bc\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c\u5247\u8fd4\u56de\u6574\u500b\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5982\u679clength\u70ba0\uff0c\u5247\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5982\u679c\u5b57\u7b26\u4e32\u70baNULL\uff0c\u5247\u8fd4\u56deNULL\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-ZiUQBMMiAH\">\u7d50\u8ad6<\/h2>\n<p>RIGHT()\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728MySQL\u4e2d\u8f15\u9b06\u5730\u5f9e\u5b57\u7b26\u4e32\u7684\u53f3\u5074\u622a\u53d6\u6240\u9700\u7684\u5b57\u7b26\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u8655\u7406\u3001\u6e05\u7406\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0cRIGHT()\u51fd\u6578\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u638c\u63e1\u9019\u500b\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bcMySQL\u53ca\u5176\u4ed6\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u548c\u652f\u6301\u3002\u7121\u8ad6\u662f\u5c0b\u627e<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u9084\u662f\u9700\u8981<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u7684\u5e6b\u52a9\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u5c08\u696d\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4RIGHT()\uff0c\u7528\u4e8e\u4ece\u5b57\u7b26\u4e32\u53f3\u4fa7\u622a\u53d6\u6307\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\uff0c\u7b80\u5316\u6570\u636e\u5904\u7406\u4e0e\u67e5\u8be2\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-79564","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79564","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=79564"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79564\/revisions"}],"predecessor-version":[{"id":79565,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79564\/revisions\/79565"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}