{"id":160849,"date":"2024-11-04T01:31:25","date_gmt":"2024-11-03T17:31:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160849\/"},"modified":"2024-11-04T01:31:26","modified_gmt":"2024-11-03T17:31:26","slug":"%e4%ba%92%e8%81%af%e7%b6%b2%e5%a4%a7%e5%bb%a0%e9%9d%a2%e8%a9%a6%ef%bc%9a%e5%9c%a8-mysql-%e4%b8%ad%e4%bd%bf%e7%94%a8-%e9%82%84%e8%83%bd%e8%b5%b0%e7%b4%a2%e5%bc%95%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160849\/","title":{"rendered":"\u4e92\u806f\u7db2\u5927\u5ee0\u9762\u8a66\uff1a\u5728 MySQL \u4e2d\u4f7f\u7528 != \u9084\u80fd\u8d70\u7d22\u5f15\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"%e4%ba%92%e8%81%af%e7%b6%b2%e5%a4%a7%e5%bb%a0%e9%9d%a2%e8%a9%a6%ef%bc%9a%e5%9c%a8-mysql-%e4%b8%ad%e4%bd%bf%e7%94%a8-%e9%82%84%e8%83%bd%e8%b5%b0%e7%b4%a2%e5%bc%95%e5%97%8e%ef%bc%9f-rszxmLDVbU\">\u4e92\u806f\u7db2\u5927\u5ee0\u9762\u8a66\uff1a\u5728 MySQL \u4e2d\u4f7f\u7528 != \u9084\u80fd\u8d70\u7d22\u5f15\u55ce\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7684\u67e5\u8a62\u512a\u5316\u4e2d\uff0c\u7d22\u5f15\u7684\u4f7f\u7528\u662f\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u95dc\u9375\u56e0\u7d20\u4e4b\u4e00\u3002\u5c0d\u65bc MySQL \u9019\u6a23\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u7d22\u5f15\u7684\u8a2d\u8a08\u548c\u4f7f\u7528\u65b9\u5f0f\u76f4\u63a5\u5f71\u97ff\u5230\u67e5\u8a62\u6027\u80fd\u3002\u5728\u9762\u8a66\u4e2d\uff0c\u7279\u5225\u662f\u91dd\u5c0d\u4e92\u806f\u7db2\u5927\u5ee0\u7684\u6280\u8853\u9762\u8a66\uff0c\u9762\u8a66\u5b98\u7d93\u5e38\u6703\u554f\u5230\u6709\u95dc\u7d22\u5f15\u7684\u554f\u984c\uff0c\u5176\u4e2d\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\u662f\uff1a\u5728 MySQL \u4e2d\u4f7f\u7528\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\uff08!=\uff09\u6642\uff0c\u662f\u5426\u9084\u80fd\u5229\u7528\u7d22\u5f15\uff1f<\/p>\n<h2 id=\"mysql-%e4%b8%ad%e7%9a%84%e7%b4%a2%e5%bc%95%e6%a6%82%e8%bf%b0-rszxmLDVbU\">MySQL \u4e2d\u7684\u7d22\u5f15\u6982\u8ff0<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u901f\u5ea6\u3002MySQL \u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec B-tree \u7d22\u5f15\u3001\u54c8\u5e0c\u7d22\u5f15\u548c\u5168\u6587\u7d22\u5f15\u7b49\u3002\u7576\u67e5\u8a62\u689d\u4ef6\u80fd\u5920\u5229\u7528\u7d22\u5f15\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\uff0c\u800c\u4e0d\u5fc5\u5168\u8868\u6383\u63cf\uff0c\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%b8%8d%e7%ad%89%e6%96%bc%e6%93%8d%e4%bd%9c%e7%ac%a6%e7%9a%84%e5%bd%b1%e9%9f%bf-rszxmLDVbU\">\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u7684\u5f71\u97ff<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\uff08!=\uff09\u9032\u884c\u67e5\u8a62\u6642\uff0c\u662f\u5426\u80fd\u5920\u5229\u7528\u7d22\u5f15\uff0c\u53d6\u6c7a\u65bc\u591a\u500b\u56e0\u7d20\u3002\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u4e86\u89e3 MySQL \u5982\u4f55\u8655\u7406\u4e0d\u7b49\u65bc\u67e5\u8a62\u3002<\/p>\n<p>\u7576\u57f7\u884c\u4e00\u500b\u5305\u542b\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u7684\u67e5\u8a62\u6642\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age != 30;<\/code><\/pre>\n<p>MySQL \u6703\u5617\u8a66\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\uff0c\u4f46\u7531\u65bc\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u7684\u7279\u6027\uff0c\u9019\u7a2e\u67e5\u8a62\u901a\u5e38\u7121\u6cd5\u6709\u6548\u5229\u7528\u7d22\u5f15\u3002\u539f\u56e0\u5728\u65bc\uff0c\u4f7f\u7528\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u6703\u5c0e\u81f4\u6578\u64da\u5eab\u9700\u8981\u6aa2\u67e5\u6240\u6709\u4e0d\u7b26\u5408\u689d\u4ef6\u7684\u884c\uff0c\u9019\u6a23\u5c31\u7121\u6cd5\u50cf\u4f7f\u7528\u7b49\u65bc\u64cd\u4f5c\u7b26\uff08=\uff09\u90a3\u6a23\u76f4\u63a5\u5b9a\u4f4d\u5230\u7279\u5b9a\u7684\u7d22\u5f15\u689d\u76ee\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8%e6%83%85%e6%b3%81-rszxmLDVbU\">\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cMySQL \u4ecd\u7136\u53ef\u80fd\u6703\u4f7f\u7528\u7d22\u5f15\u4f86\u512a\u5316\u4e0d\u7b49\u65bc\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u5982\u679c\u67e5\u8a62\u4e2d\u9084\u5305\u542b\u5176\u4ed6\u689d\u4ef6\uff0c\u4e26\u4e14\u9019\u4e9b\u689d\u4ef6\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\uff0c\u90a3\u9ebc MySQL \u53ef\u80fd\u6703\u9078\u64c7\u4f7f\u7528\u7d22\u5f15\u4f86\u904e\u6ffe\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age != 30 AND city = 'Hong Kong';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u5047\u8a2d `city` \u5217\u4e0a\u6709\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u9996\u5148\u5229\u7528 `city` \u7684\u7d22\u5f15\u4f86\u7e2e\u5c0f\u7d50\u679c\u96c6\uff0c\u7136\u5f8c\u518d\u5c0d\u5269\u9918\u7684\u6578\u64da\u9032\u884c\u4e0d\u7b49\u65bc\u7684\u904e\u6ffe\u3002\u9019\u6a23\u7684\u67e5\u8a62\u6548\u7387\u6703\u6bd4\u55ae\u7d14\u7684\u5168\u8868\u6383\u63cf\u8981\u9ad8\u5f97\u591a\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-rszxmLDVbU\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\u76e1\u91cf\u907f\u514d\u4f7f\u7528\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u7b49\u65bc\u64cd\u4f5c\u7b26\uff08=\uff09\u6216\u7bc4\u570d\u67e5\u8a62\uff08BETWEEN\u3001&gt;\u3001&lt;\uff09\u4f86\u66ff\u4ee3\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\u3002<\/li>\n<li>\u8003\u616e\u4f7f\u7528 NULL \u503c\u4f86\u8868\u793a\u7f3a\u5931\u7684\u6578\u64da\uff0c\u4e26\u4f7f\u7528 IS NULL \u6216 IS NOT NULL \u9032\u884c\u67e5\u8a62\u3002<\/li>\n<li>\u5728\u67e5\u8a62\u4e2d\u7d50\u5408\u5176\u4ed6\u689d\u4ef6\uff0c\u5229\u7528\u7d22\u5f15\u4f86\u904e\u6ffe\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-rszxmLDVbU\">\u7d50\u8ad6<\/h2>\n<p>\u5728 MySQL \u4e2d\u4f7f\u7528\u4e0d\u7b49\u65bc\u64cd\u4f5c\u7b26\uff08!=\uff09\u6642\uff0c\u901a\u5e38\u7121\u6cd5\u6709\u6548\u5229\u7528\u7d22\u5f15\uff0c\u9019\u6703\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u7d50\u5408\u5176\u4ed6\u689d\u4ef6\u4ecd\u7136\u53ef\u4ee5\u90e8\u5206\u5229\u7528\u7d22\u5f15\u3002\u4e86\u89e3\u9019\u4e9b\u7d30\u7bc0\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u512a\u5316\u81f3\u95dc\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u9762\u8a66\u4e2d\uff0c\u80fd\u5920\u6e05\u6670\u5730\u89e3\u91cb\u9019\u4e9b\u6982\u5ff5\u5c07\u6709\u52a9\u65bc\u5c55\u793a\u4f60\u7684\u5c08\u696d\u77e5\u8b58\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u4f60\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u78ba\u4fdd\u5728\u9ad8\u6d41\u91cf\u60c5\u6cc1\u4e0b\u4ecd\u80fd\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u8a0e\u4e92\u806f\u7db2\u5927\u5ee0\u9762\u8a66\u4e2d\uff0cMySQL \u4f7f\u7528 != \u662f\u5426\u5f71\u97ff\u7d22\u5f15\u6548\u7387\uff0c\u63ed\u793a\u6700\u4f73\u5be6\u8e10\u8207\u6027\u80fd\u512a\u5316\u6280\u5de7\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-160849","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160849","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=160849"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160849\/revisions"}],"predecessor-version":[{"id":160850,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160849\/revisions\/160850"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}