{"id":143817,"date":"2024-11-01T01:30:29","date_gmt":"2024-10-31T17:30:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143817\/"},"modified":"2024-11-01T01:30:31","modified_gmt":"2024-10-31T17:30:31","slug":"sql-%e5%87%bd%e6%95%b8%e7%94%9f%e6%88%90%e5%8a%a9%e8%a8%98%e7%a2%bc%e7%9a%84%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143817\/","title":{"rendered":"SQL \u51fd\u6578\u751f\u6210\u52a9\u8a18\u78bc\u7684\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"sql-%e5%87%bd%e6%95%b8%e7%94%9f%e6%88%90%e5%8a%a9%e8%a8%98%e7%a2%bc%e7%9a%84%e5%af%a6%e4%be%8b-CyzAUyONqX\">SQL \u51fd\u6578\u751f\u6210\u52a9\u8a18\u78bc\u7684\u5be6\u4f8b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u52a9\u8a18\u78bc\uff08Mnemonic Code\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7c21\u5316\u6578\u64da\u8b58\u5225\u548c\u8a18\u61b6\u7684\u6280\u8853\u3002\u9019\u4e9b\u52a9\u8a18\u78bc\u901a\u5e38\u7531\u4e00\u7d44\u5b57\u6bcd\u6216\u6578\u5b57\u7d44\u6210\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u8b58\u5225\u7279\u5b9a\u7684\u6578\u64da\u689d\u76ee\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528 SQL \u51fd\u6578\u4f86\u751f\u6210\u52a9\u8a18\u78bc\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u969b\u7684\u4f8b\u5b50\u4f86\u8aaa\u660e\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e5%8a%a9%e8%a8%98%e7%a2%bc%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-CyzAUyONqX\">\u52a9\u8a18\u78bc\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u52a9\u8a18\u78bc\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4f7f\u6578\u64da\u66f4\u6613\u65bc\u8a18\u61b6\u548c\u4f7f\u7528\u3002\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u52a9\u8a18\u78bc\u53ef\u4ee5\u7528\u65bc\u6a19\u8b58\u7522\u54c1\u3001\u7528\u6236\u6216\u5176\u4ed6\u6578\u64da\u5be6\u9ad4\u3002\u9019\u4e9b\u78bc\u901a\u5e38\u662f\u57fa\u65bc\u67d0\u4e9b\u898f\u5247\u751f\u6210\u7684\uff0c\u4f8b\u5982\u53d6\u81ea\u540d\u7a31\u7684\u9996\u5b57\u6bcd\u3001\u6578\u5b57\u5e8f\u5217\u6216\u5176\u4ed6\u7279\u5b9a\u7684\u6a21\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e5%87%bd%e6%95%b8%e7%94%9f%e6%88%90%e5%8a%a9%e8%a8%98%e7%a2%bc-CyzAUyONqX\">\u4f7f\u7528 SQL \u51fd\u6578\u751f\u6210\u52a9\u8a18\u78bc<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u51fd\u6578\u4f86\u751f\u6210\u52a9\u8a18\u78bc\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u51fd\u6578\u53ca\u5176\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-substring-%e5%87%bd%e6%95%b8-CyzAUyONqX\">1. \u4f7f\u7528 SUBSTRING \u51fd\u6578<\/h3>\n<p>SUBSTRING \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u7279\u5b9a\u90e8\u5206\uff0c\u9019\u5c0d\u65bc\u751f\u6210\u52a9\u8a18\u78bc\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u5305\u542b\u7528\u6236\u7684\u59d3\u540d\uff0c\u6211\u5011\u53ef\u4ee5\u5f9e\u59d3\u540d\u4e2d\u63d0\u53d6\u9996\u5b57\u6bcd\u4f86\u751f\u6210\u52a9\u8a18\u78bc\u3002<\/p>\n<pre><code>SELECT \n    CONCAT(SUBSTRING(first_name, 1, 1), SUBSTRING(last_name, 1, 1)) AS mnemonic_code\nFROM \n    users;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e\u7528\u6236\u7684\u540d\u5b57\u548c\u59d3\u6c0f\u4e2d\u63d0\u53d6\u9996\u5b57\u6bcd\uff0c\u4e26\u5c07\u5b83\u5011\u9023\u63a5\u8d77\u4f86\u5f62\u6210\u52a9\u8a18\u78bc\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-concat-%e5%87%bd%e6%95%b8-CyzAUyONqX\">2. \u4f7f\u7528 CONCAT \u51fd\u6578<\/h3>\n<p>CONCAT \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u5c07\u591a\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u5728\u4e00\u8d77\u3002\u9019\u5728\u751f\u6210\u66f4\u8907\u96dc\u7684\u52a9\u8a18\u78bc\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u5c07\u7528\u6236\u7684 ID \u548c\u59d3\u540d\u7d50\u5408\u8d77\u4f86\u751f\u6210\u552f\u4e00\u7684\u52a9\u8a18\u78bc\u3002<\/p>\n<pre><code>SELECT \n    CONCAT(user_id, '_', first_name, '_', last_name) AS mnemonic_code\nFROM \n    users;<\/code><\/pre>\n<p>\u9019\u6a23\u751f\u6210\u7684\u52a9\u8a18\u78bc\u5c07\u5305\u542b\u7528\u6236\u7684 ID \u548c\u59d3\u540d\uff0c\u4fbf\u65bc\u8b58\u5225\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-upper-%e5%92%8c-lower-%e5%87%bd%e6%95%b8-CyzAUyONqX\">3. \u4f7f\u7528 UPPER \u548c LOWER \u51fd\u6578<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u5e0c\u671b\u5c07\u52a9\u8a18\u78bc\u8f49\u63db\u70ba\u5168\u5927\u5beb\u6216\u5168\u5c0f\u5beb\uff0c\u4ee5\u4fdd\u6301\u4e00\u81f4\u6027\u3002\u9019\u53ef\u4ee5\u901a\u904e UPPER \u548c LOWER \u51fd\u6578\u4f86\u5be6\u73fe\u3002<\/p>\n<pre><code>SELECT \n    UPPER(CONCAT(SUBSTRING(first_name, 1, 1), SUBSTRING(last_name, 1, 1))) AS mnemonic_code\nFROM \n    users;<\/code><\/pre>\n<p>\u9019\u6a23\u751f\u6210\u7684\u52a9\u8a18\u78bc\u5c07\u5168\u90e8\u8f49\u63db\u70ba\u5927\u5beb\u5b57\u6bcd\uff0c\u4fbf\u65bc\u7d71\u4e00\u7ba1\u7406\u3002<\/p>\n<h2 id=\"%e5%8a%a9%e8%a8%98%e7%a2%bc%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-CyzAUyONqX\">\u52a9\u8a18\u78bc\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u52a9\u8a18\u78bc\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u7528\u6236\u8b58\u5225\uff1a\u5728\u7528\u6236\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u52a9\u8a18\u78bc\u53ef\u4ee5\u5e6b\u52a9\u5feb\u901f\u8b58\u5225\u7528\u6236\u3002<\/li>\n<li>\u7522\u54c1\u6a19\u8b58\uff1a\u5728\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u52a9\u8a18\u78bc\u53ef\u4ee5\u7528\u65bc\u6a19\u8b58\u7522\u54c1\uff0c\u65b9\u4fbf\u7528\u6236\u67e5\u627e\u3002<\/li>\n<li>\u6578\u64da\u5206\u6790\uff1a\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u52a9\u8a18\u78bc\u53ef\u4ee5\u7528\u65bc\u7c21\u5316\u6578\u64da\u96c6\u7684\u8655\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CyzAUyONqX\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4f7f\u7528 SQL \u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u751f\u6210\u52a9\u8a18\u78bc\uff0c\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u7684\u53ef\u8b80\u6027\uff0c\u9084\u80fd\u5920\u52a0\u5feb\u6578\u64da\u7684\u6aa2\u7d22\u901f\u5ea6\u3002\u7121\u8ad6\u662f\u5728\u7528\u6236\u7ba1\u7406\u3001\u7522\u54c1\u6a19\u8b58\u9084\u662f\u6578\u64da\u5206\u6790\u4e2d\uff0c\u52a9\u8a18\u78bc\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u7cfb\u7d71\u4e2d\u5be6\u73fe\u9019\u4e9b\u529f\u80fd\u6709\u8208\u8da3\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u60a8\u7684\u6578\u64da\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u51fd\u6578\u751f\u6210\u52a9\u8a18\u78bc\u7684\u5be6\u4f8b\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u5275\u5efa\u548c\u7ba1\u7406\u52a9\u8a18\u78bc\u4ee5\u63d0\u5347\u6578\u64da\u67e5\u8a62\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-143817","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143817","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=143817"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143817\/revisions"}],"predecessor-version":[{"id":143818,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143817\/revisions\/143818"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}