{"id":160759,"date":"2024-11-04T00:46:23","date_gmt":"2024-11-03T16:46:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160759\/"},"modified":"2024-11-04T00:46:24","modified_gmt":"2024-11-03T16:46:24","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql%e5%b8%b8%e7%94%a8%e9%81%8b%e7%ae%97%e7%ac%a6%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160759\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL\u5e38\u7528\u904b\u7b97\u7b26\u6982\u8ff0"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql%e5%b8%b8%e7%94%a8%e9%81%8b%e7%ae%97%e7%ac%a6%e6%a6%82%e8%bf%b0-uoYUgjkZKM\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL\u5e38\u7528\u904b\u7b97\u7b26\u6982\u8ff0<\/h1>\n<p>\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u958b\u6e90\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u4e86\u89e3MySQL\u7684\u904b\u7b97\u7b26\u5c0d\u65bc\u6709\u6548\u5730\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u4ecb\u7d39MySQL\u4e2d\u5e38\u7528\u7684\u904b\u7b97\u7b26\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u638c\u63e1\u6578\u64da\u5eab\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"1-%e6%af%94%e8%bc%83%e9%81%8b%e7%ae%97%e7%ac%a6-uoYUgjkZKM\">1. \u6bd4\u8f03\u904b\u7b97\u7b26<\/h2>\n<p>\u6bd4\u8f03\u904b\u7b97\u7b26\u7528\u65bc\u6bd4\u8f03\u5169\u500b\u503c\uff0c\u4e26\u8fd4\u56de\u5e03\u6797\u503c\uff08\u771f\u6216\u5047\uff09\u3002\u4ee5\u4e0b\u662fMySQL\u4e2d\u5e38\u7528\u7684\u6bd4\u8f03\u904b\u7b97\u7b26\uff1a<\/p>\n<ul>\n<li><code>=<\/code>\uff1a\u7b49\u65bc<\/li>\n<li><code>!=<\/code> \u6216 <code><\/code>\uff1a\u4e0d\u7b49\u65bc<\/li>\n<li><code>&gt;<\/code>\uff1a\u5927\u65bc<\/li>\n<li><code>&lt;<\/code>\uff1a\u5c0f\u65bc<\/li>\n<li><code>&gt;=<\/code>\uff1a\u5927\u65bc\u6216\u7b49\u65bc<\/li>\n<li><code>&lt;=<\/code>\uff1a\u5c0f\u65bc\u6216\u7b49\u65bc<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5e74\u9f61\u5927\u65bc30\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<h2 id=\"2-%e9%82%8f%e8%bc%af%e9%81%8b%e7%ae%97%e7%ac%a6-uoYUgjkZKM\">2. \u908f\u8f2f\u904b\u7b97\u7b26<\/h2>\n<p>\u908f\u8f2f\u904b\u7b97\u7b26\u7528\u65bc\u7d44\u5408\u591a\u500b\u689d\u4ef6\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><code>AND<\/code>\uff1a\u7576\u6240\u6709\u689d\u4ef6\u90fd\u70ba\u771f\u6642\u8fd4\u56de\u771f<\/li>\n<li><code>OR<\/code>\uff1a\u7576\u81f3\u5c11\u4e00\u500b\u689d\u4ef6\u70ba\u771f\u6642\u8fd4\u56de\u771f<\/li>\n<li><code>NOT<\/code>\uff1a\u53cd\u8f49\u689d\u4ef6\u7684\u5e03\u6797\u503c<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u5e74\u9f61\u5927\u65bc30\u4e14\u6027\u5225\u70ba\u7537\u6027\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 30 AND gender = 'male';<\/code><\/pre>\n<h2 id=\"3-%e7%ae%97%e8%a1%93%e9%81%8b%e7%ae%97%e7%ac%a6-uoYUgjkZKM\">3. \u7b97\u8853\u904b\u7b97\u7b26<\/h2>\n<p>\u7b97\u8853\u904b\u7b97\u7b26\u7528\u65bc\u57f7\u884c\u6578\u5b78\u8a08\u7b97\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>+<\/code>\uff1a\u52a0\u6cd5<\/li>\n<li><code>-<\/code>\uff1a\u6e1b\u6cd5<\/li>\n<li><code>*<\/code>\uff1a\u4e58\u6cd5<\/li>\n<li><code>\/<\/code>\uff1a\u9664\u6cd5<\/li>\n<li><code>%<\/code>\uff1a\u53d6\u9918\u6578<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8a08\u7b97\u6240\u6709\u7528\u6236\u7684\u5e74\u9f61\u7e3d\u548c\uff1a<\/p>\n<pre><code>SELECT SUM(age) FROM users;<\/code><\/pre>\n<h2 id=\"4-%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%81%8b%e7%ae%97%e7%ac%a6-uoYUgjkZKM\">4. \u5b57\u7b26\u4e32\u904b\u7b97\u7b26<\/h2>\n<p>MySQL\u9084\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5b57\u7b26\u4e32\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u64cd\u4f5c\u6587\u672c\u6578\u64da\u3002\u6700\u5e38\u7528\u7684\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>CONCAT()<\/code>\uff1a\u9023\u63a5\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32<\/li>\n<li><code>LENGTH()<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6<\/li>\n<li><code>UPPER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb<\/li>\n<li><code>LOWER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5c0f\u5beb<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u7684\u5168\u540d\uff08\u540d\u548c\u59d3\u7684\u9023\u63a5\uff09\uff1a<\/p>\n<pre><code>SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM users;<\/code><\/pre>\n<h2 id=\"5-%e7%89%b9%e6%ae%8a%e9%81%8b%e7%ae%97%e7%ac%a6-uoYUgjkZKM\">5. \u7279\u6b8a\u904b\u7b97\u7b26<\/h2>\n<p>MySQL\u9084\u6709\u4e00\u4e9b\u7279\u6b8a\u904b\u7b97\u7b26\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><code>IS NULL<\/code>\uff1a\u6aa2\u67e5\u503c\u662f\u5426\u70baNULL<\/li>\n<li><code>BETWEEN<\/code>\uff1a\u6aa2\u67e5\u503c\u662f\u5426\u5728\u6307\u5b9a\u7bc4\u570d\u5167<\/li>\n<li><code>IN()<\/code>\uff1a\u6aa2\u67e5\u503c\u662f\u5426\u5728\u4e00\u7d44\u503c\u4e2d<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u5e74\u9f61\u572820\u523030\u4e4b\u9593\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age BETWEEN 20 AND 30;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uoYUgjkZKM\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1MySQL\u7684\u5e38\u7528\u904b\u7b97\u7b26\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6709\u6548\u64cd\u4f5c\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u6bd4\u8f03\u904b\u7b97\u7b26\u3001\u908f\u8f2f\u904b\u7b97\u7b26\u3001\u7b97\u8853\u904b\u7b97\u7b26\u3001\u5b57\u7b26\u4e32\u904b\u7b97\u7b26\u548c\u7279\u6b8a\u904b\u7b97\u7b26\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u9748\u6d3b\u5730\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u5e38\u7528\u904b\u7b97\u7b26\u7684\u5168\u9762\u6982\u8ff0\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u9019\u4e9b\u904b\u7b97\u7b26\u4f86\u512a\u5316\u8cc7\u6599\u5eab\u67e5\u8a62\u548c\u7ba1\u7406\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-160759","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160759","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=160759"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160759\/revisions"}],"predecessor-version":[{"id":160760,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160759\/revisions\/160760"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}