{"id":5930,"date":"2024-11-14T10:22:01","date_gmt":"2024-11-14T02:22:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5930\/"},"modified":"2024-11-14T10:22:01","modified_gmt":"2024-11-14T02:22:01","slug":"sql%e8%af%ad%e5%8f%a5%e4%b8%8d%e7%ad%89%e4%ba%8e%e6%80%8e%e4%b9%88%e5%86%99","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5930\/","title":{"rendered":"sql\u8bed\u53e5\u4e0d\u7b49\u4e8e\u600e\u4e48\u5199"},"content":{"rendered":"<blockquote><p>\n  \u5728 sql \u4e2d\uff0c\u4e0d\u7b49\u4e8e\u53f7\u53ef\u4ee5\u4f7f\u7528\u4e24\u4e2a\u8fd0\u7b97\u7b26\uff1a!= \u548c \u3002!= \u662f\u6700\u5e38\u89c1\u7684\u5f62\u5f0f\uff0c\u8868\u793a\u4e24\u4e2a\u503c\u4e0d\u76f8\u540c\u3002 \u8fd0\u7b97\u7b26\u529f\u80fd\u76f8\u540c\uff0c\u4f46\u5efa\u8bae\u4f7f\u7528 !=\uff0c\u56e0\u4e3a\u5b83\u66f4\u5e38\u7528\u4e14\u6613\u4e8e\u7406\u89e3\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202406\/03\/2024060322391792294.jpg\" class=\"aligncenter\" title=\"sql\u8bed\u53e5\u4e0d\u7b49\u4e8e\u600e\u4e48\u5199\u63d2\u56fe\" alt=\"sql\u8bed\u53e5\u4e0d\u7b49\u4e8e\u600e\u4e48\u5199\u63d2\u56fe\" \/><\/p>\n<p><strong>SQL \u4e0d\u7b49\u4e8e\u53f7\uff1a!= \u4e0e <\/strong><\/p>\n<p>\u5728 SQL \u4e2d\uff0c\u4e0d\u7b49\u4e8e\u53f7\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cd\u4e0d\u540c\u7684\u8fd0\u7b97\u7b26\uff1a!= \u548c \u3002<\/p>\n<p><strong>!= \u8fd0\u7b97\u7b26<\/strong><\/p>\n<p>!= \u662f\u4e0d\u7b49\u4e8e\u53f7\u7684\u6700\u5e38\u89c1\u5f62\u5f0f\u3002\u5b83\u8868\u793a\u4e24\u4e2a\u503c\u4e0d\u76f8\u540c\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>expression1 != expression2<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>expression1 \u548c expression2 \u662f\u8981\u6bd4\u8f83\u7684\u503c\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>SELECT * FROM table_name WHERE column_name != 'value';<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u5c06\u9009\u62e9 table_name \u8868\u4e2d\u6240\u6709 column_name \u503c\u4e0d\u7b49\u4e8e &#8216;value&#8217; \u7684\u884c\u3002<\/p>\n<p><strong> \u8fd0\u7b97\u7b26<\/strong><\/p>\n<p> \u8fd0\u7b97\u7b26\u4e5f\u662f\u4e0d\u7b49\u4e8e\u53f7\uff0c\u4f46\u5b83\u4e0d\u90a3\u4e48\u5e38\u7528\u3002\u5b83\u7684\u8bed\u6cd5\u4e0e != \u76f8\u540c\u3002<\/p>\n<p><strong>\u4f7f\u7528\u54ea\u79cd\u8fd0\u7b97\u7b26\uff1f<\/strong><\/p>\n<p>\u867d\u7136 != \u548c \u5728\u529f\u80fd\u4e0a\u662f\u7b49\u6548\u7684\uff0c\u4f46\u4e00\u822c\u5efa\u8bae\u4f7f\u7528 !=\uff0c\u56e0\u4e3a\u5b83\u66f4\u5e38\u7528\uff0c\u5e76\u4e14\u66f4\u5bb9\u6613\u9605\u8bfb\u548c\u7406\u89e3\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4e0d\u7b49\u4e8e\u600e\u4e48\u5199\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 sql \u4e2d\uff0c\u4e0d\u7b49\u4e8e\u53f7\u53ef\u4ee5\u4f7f\u7528\u4e24\u4e2a\u8fd0\u7b97\u7b26\uff1a!= \u548c \u3002!= \u662f\u6700\u5e38\u89c1\u7684\u5f62\u5f0f\uff0c\u8868\u793a\u4e24\u4e2a\u503c\u4e0d\u76f8\u540c\u3002 \u8fd0\u7b97\u7b26\u529f\u80fd\u76f8\u540c\uff0c\u4f46\u5efa\u8bae\u4f7f\u7528 !=\uff0c\u56e0\u4e3a\u5b83\u66f4\u5e38\u7528\u4e14\u6613\u4e8e\u7406\u89e3\u3002 SQL \u4e0d\u7b49\u4e8e\u53f7\uff1a!= \u4e0e \u5728 SQL \u4e2d\uff0c\u4e0d\u7b49\u4e8e\u53f7\u53ef\u4ee5\u4f7f\u7528\u4e24\u79cd\u4e0d\u540c\u7684\u8fd0\u7b97\u7b26\uff1a!= \u548c \u3002 != \u8fd0\u7b97\u7b26 != \u662f\u4e0d\u7b49\u4e8e\u53f7\u7684\u6700\u5e38\u89c1\u5f62\u5f0f\u3002\u5b83\u8868\u793a\u4e24\u4e2a\u503c\u4e0d\u76f8\u540c\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a expression1 != expression2 \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a expression1 \u548c expression2 \u662f\u8981\u6bd4\u8f83\u7684\u503c\u3002 \u4f8b\u5982\uff1a SELECT * FROM table_name WHERE column_name != &#8216;value&#8217;; \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u5c06\u9009\u62e9 table_name \u8868\u4e2d\u6240\u6709 column_name \u503c\u4e0d\u7b49\u4e8e &#8216;value&#8217; \u7684\u884c\u3002 \u8fd0\u7b97\u7b26 \u8fd0\u7b97\u7b26\u4e5f\u662f\u4e0d\u7b49\u4e8e\u53f7\uff0c\u4f46\u5b83\u4e0d\u90a3\u4e48\u5e38\u7528\u3002\u5b83\u7684\u8bed\u6cd5\u4e0e != \u76f8\u540c\u3002 \u4f7f\u7528\u54ea\u79cd\u8fd0\u7b97\u7b26\uff1f \u867d\u7136 != \u548c \u5728\u529f\u80fd\u4e0a\u662f\u7b49\u6548\u7684\uff0c\u4f46\u4e00\u822c\u5efa\u8bae\u4f7f\u7528 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5930","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5930"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5930\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}