{"id":143973,"date":"2024-11-01T02:48:19","date_gmt":"2024-10-31T18:48:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143973\/"},"modified":"2024-11-01T02:48:20","modified_gmt":"2024-10-31T18:48:20","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5%ef%bc%9a%e8%bc%95%e9%ac%86%e5%82%99%e4%bb%bd%e5%92%8c%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a-sql-%e6%95%b8%e6%93%9a%e5%ba%ab-%e8%a4%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143973\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u8907\u88fd\u5b57\u6bb5\uff1a\u8f15\u9b06\u5099\u4efd\u548c\u4fee\u6539\u6578\u64da (sql \u6578\u64da\u5eab \u8907\u88fd\u5b57\u6bb5)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5%ef%bc%9a%e8%bc%95%e9%ac%86%e5%82%99%e4%bb%bd%e5%92%8c%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a-LBpEbrgVvr\">SQL \u6578\u64da\u5eab\u8907\u88fd\u5b57\u6bb5\uff1a\u8f15\u9b06\u5099\u4efd\u548c\u4fee\u6539\u6578\u64da<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u64cd\u4f5c\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f5c\u70ba\u4e00\u7a2e\u5ee3\u6cdb\u4f7f\u7528\u7684\u6578\u64da\u5eab\u8a9e\u8a00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u6578\u64da\u3002\u5176\u4e2d\uff0c\u8907\u88fd\u5b57\u6bb5\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u5099\u4efd\u548c\u4fee\u6539\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u8907\u88fd\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%ad%97%e6%ae%b5%e8%a4%87%e8%a3%bd%ef%bc%9f-LBpEbrgVvr\">\u4ec0\u9ebc\u662f\u5b57\u6bb5\u8907\u88fd\uff1f<\/h2>\n<p>\u5b57\u6bb5\u8907\u88fd\u662f\u6307\u5c07\u4e00\u500b\u6578\u64da\u8868\u4e2d\u7684\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8907\u88fd\u5230\u540c\u4e00\u8868\u6216\u53e6\u4e00\u8868\u4e2d\u7684\u76f8\u61c9\u5b57\u6bb5\u3002\u9019\u4e00\u904e\u7a0b\u901a\u5e38\u7528\u65bc\u6578\u64da\u5099\u4efd\u3001\u6578\u64da\u9077\u79fb\u6216\u6578\u64da\u4fee\u6539\u7b49\u5834\u666f\u3002\u901a\u904e\u8907\u88fd\u5b57\u6bb5\uff0c\u7528\u6236\u53ef\u4ee5\u5feb\u901f\u5730\u5275\u5efa\u6578\u64da\u7684\u526f\u672c\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u4e1f\u5931\u6216\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5%ef%bc%9f-LBpEbrgVvr\">\u70ba\u4ec0\u9ebc\u9700\u8981\u8907\u88fd\u5b57\u6bb5\uff1f<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5099\u4efd\uff1a<\/strong>\u5728\u9032\u884c\u6578\u64da\u4fee\u6539\u4e4b\u524d\uff0c\u8907\u88fd\u5b57\u6bb5\u53ef\u4ee5\u4f5c\u70ba\u4e00\u7a2e\u5099\u4efd\u63aa\u65bd\uff0c\u78ba\u4fdd\u539f\u59cb\u6578\u64da\u4e0d\u6703\u4e1f\u5931\u3002<\/li>\n<li><strong>\u6578\u64da\u9077\u79fb\uff1a<\/strong>\u5728\u5c07\u6578\u64da\u5f9e\u4e00\u500b\u8868\u9077\u79fb\u5230\u53e6\u4e00\u500b\u8868\u6642\uff0c\u8907\u88fd\u5b57\u6bb5\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u6578\u64da\u4fee\u6539\uff1a<\/strong>\u5728\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u6279\u91cf\u4fee\u6539\u6642\uff0c\u8907\u88fd\u5b57\u6bb5\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5728\u4fee\u6539\u524d\u4fdd\u7559\u539f\u59cb\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e4%b8%ad%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5-LBpEbrgVvr\">\u5982\u4f55\u5728 SQL \u4e2d\u8907\u88fd\u5b57\u6bb5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u8907\u88fd\u5b57\u6bb5\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528 <code>UPDATE<\/code> \u548c <code>SET<\/code> \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5c07\u4e00\u500b\u8868\u4e2d\u7684\u5b57\u6bb5\u6578\u64da\u8907\u88fd\u5230\u53e6\u4e00\u500b\u5b57\u6bb5\u4e2d\u3002<\/p>\n<pre><code>UPDATE \u8868\u540d\nSET \u76ee\u6a19\u5b57\u6bb5 = \u6e90\u5b57\u6bb5\nWHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u8a72\u8868\u5305\u542b <code>first_name<\/code> \u548c <code>last_name<\/code> \u5169\u500b\u5b57\u6bb5\u3002\u5982\u679c\u6211\u5011\u60f3\u5c07 <code>first_name<\/code> \u7684\u6578\u64da\u8907\u88fd\u5230 <code>last_name<\/code> \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>UPDATE employees\nSET last_name = first_name\nWHERE last_name IS NULL;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u6240\u6709 <code>last_name<\/code> \u70ba NULL \u7684\u8a18\u9304\u7684 <code>last_name<\/code> \u5b57\u6bb5\u8a2d\u7f6e\u70ba <code>first_name<\/code> \u7684\u503c\u3002<\/p>\n<h2 id=\"%e8%a4%87%e8%a3%bd%e5%ad%97%e6%ae%b5%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-LBpEbrgVvr\">\u8907\u88fd\u5b57\u6bb5\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u5b57\u6bb5\u8907\u88fd\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\uff1a<\/strong>\u78ba\u4fdd\u6e90\u5b57\u6bb5\u548c\u76ee\u6a19\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u76f8\u5bb9\uff0c\u4ee5\u907f\u514d\u6578\u64da\u8f49\u63db\u932f\u8aa4\u3002<\/li>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u5728\u8907\u88fd\u904e\u7a0b\u4e2d\uff0c\u61c9\u6ce8\u610f\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u907f\u514d\u51fa\u73fe\u91cd\u8907\u6216\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u5099\u4efd\u539f\u59cb\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u4efb\u4f55\u6578\u64da\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u539f\u59cb\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u4e1f\u5931\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-LBpEbrgVvr\">\u7d50\u8ad6<\/h2>\n<p>SQL \u6578\u64da\u5eab\u4e2d\u7684\u5b57\u6bb5\u8907\u88fd\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u5099\u4efd\u548c\u4fee\u6539\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528 <code>UPDATE<\/code> \u548c <code>SET<\/code> \u8a9e\u53e5\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u4e00\u81f4\u6027\u3002\u5728\u9032\u884c\u5b57\u6bb5\u8907\u88fd\u6642\uff0c\u52d9\u5fc5\u6ce8\u610f\u6578\u64da\u985e\u578b\u3001\u5b8c\u6574\u6027\u548c\u5099\u4efd\u539f\u59cb\u6578\u64da\uff0c\u4ee5\u78ba\u4fdd\u64cd\u4f5c\u7684\u6210\u529f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u8f15\u9b06\u8907\u88fd\u5b57\u6bb5\uff0c\u5099\u4efd\u548c\u4fee\u6539\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\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-143973","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143973","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=143973"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143973\/revisions"}],"predecessor-version":[{"id":143974,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143973\/revisions\/143974"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}