{"id":77620,"date":"2024-10-16T10:54:49","date_gmt":"2024-10-16T02:54:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77620\/"},"modified":"2024-10-16T10:54:49","modified_gmt":"2024-10-16T02:54:49","slug":"mysql%e9%81%8b%e7%ae%97%e7%ac%a6%e8%88%87%e5%85%b6%e7%8d%b2%e5%be%97%e6%9b%b4%e5%a4%9a%e7%9b%b8%e9%97%9c%e6%95%b8%e6%93%9a%e7%9a%84%e6%af%94%e8%bc%83%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77620\/","title":{"rendered":"MySQL\u904b\u7b97\u7b26\u8207\u5176\u7372\u5f97\u66f4\u591a\u76f8\u95dc\u6578\u64da\u7684\u6bd4\u8f03\u529f\u80fd"},"content":{"rendered":"<h1 id=\"mysql%e9%81%8b%e7%ae%97%e7%ac%a6%e8%88%87%e5%85%b6%e7%8d%b2%e5%be%97%e6%9b%b4%e5%a4%9a%e7%9b%b8%e9%97%9c%e6%95%b8%e6%93%9a%e7%9a%84%e6%af%94%e8%bc%83%e5%8a%9f%e8%83%bd-WnQoDXevVP\">MySQL\u904b\u7b97\u7b26\u8207\u5176\u7372\u5f97\u66f4\u591a\u76f8\u95dc\u6578\u64da\u7684\u6bd4\u8f03\u529f\u80fd<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u9078\u64c7\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u904b\u7b97\u7b26\u4f86\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u64cd\u4f5c\u3002\u9019\u4e9b\u904b\u7b97\u7b26\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\uff0c\u9084\u80fd\u9032\u884c\u66f4\u70ba\u8907\u96dc\u7684\u6578\u64da\u6bd4\u8f03\u548c\u7be9\u9078\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684\u904b\u7b97\u7b26\u53ca\u5176\u5728\u6578\u64da\u6bd4\u8f03\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"mysql%e9%81%8b%e7%ae%97%e7%ac%a6%e6%a6%82%e8%bf%b0-WnQoDXevVP\">MySQL\u904b\u7b97\u7b26\u6982\u8ff0<\/h2>\n<p>MySQL\u904b\u7b97\u7b26\u53ef\u4ee5\u5206\u70ba\u5e7e\u500b\u4e3b\u8981\u985e\u5225\uff0c\u5305\u62ec\u7b97\u8853\u904b\u7b97\u7b26\u3001\u6bd4\u8f03\u904b\u7b97\u7b26\u3001\u908f\u8f2f\u904b\u7b97\u7b26\u548c\u4f4d\u5143\u904b\u7b97\u7b26\u3002\u9019\u4e9b\u904b\u7b97\u7b26\u5728\u67e5\u8a62\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\uff0c\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u7684\u7be9\u9078\u548c\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"1-%e7%ae%97%e8%a1%93%e9%81%8b%e7%ae%97%e7%ac%a6-WnQoDXevVP\">1. \u7b97\u8853\u904b\u7b97\u7b26<\/h3>\n<ul>\n<li><code>+<\/code>\uff1a\u52a0\u6cd5\u904b\u7b97\u7b26<\/li>\n<li><code>-<\/code>\uff1a\u6e1b\u6cd5\u904b\u7b97\u7b26<\/li>\n<li><code>*<\/code>\uff1a\u4e58\u6cd5\u904b\u7b97\u7b26<\/li>\n<li><code>\/<\/code>\uff1a\u9664\u6cd5\u904b\u7b97\u7b26<\/li>\n<li><code>%<\/code>\uff1a\u53d6\u9918\u6578\u904b\u7b97\u7b26<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u67d0\u500b\u7522\u54c1\u7684\u7e3d\u50f9\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT price * quantity AS total_price FROM products;<\/code><\/pre>\n<h3 id=\"2-%e6%af%94%e8%bc%83%e9%81%8b%e7%ae%97%e7%ac%a6-WnQoDXevVP\">2. \u6bd4\u8f03\u904b\u7b97\u7b26<\/h3>\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\u5e38\u898b\u7684\u6bd4\u8f03\u904b\u7b97\u7b26\u5305\u62ec\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\u7b49\u65bc<\/li>\n<li><code>&lt;=<\/code>\uff1a\u5c0f\u65bc\u7b49\u65bc<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u50f9\u683c\u9ad8\u65bc100\u7684\u7522\u54c1\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM products WHERE price &gt; 100;<\/code><\/pre>\n<h3 id=\"3-%e9%82%8f%e8%bc%af%e9%81%8b%e7%ae%97%e7%ac%a6-WnQoDXevVP\">3. \u908f\u8f2f\u904b\u7b97\u7b26<\/h3>\n<p>\u908f\u8f2f\u904b\u7b97\u7b26\u7528\u65bc\u7d44\u5408\u591a\u500b\u689d\u4ef6\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>AND<\/code>\uff1a\u8207<\/li>\n<li><code>OR<\/code>\uff1a\u6216<\/li>\n<li><code>NOT<\/code>\uff1a\u975e<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u50f9\u683c\u9ad8\u65bc100\u4e14\u5eab\u5b58\u91cf\u5927\u65bc50\u7684\u7522\u54c1\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM products WHERE price &gt; 100 AND stock &gt; 50;<\/code><\/pre>\n<h3 id=\"4-%e4%bd%8d%e5%85%83%e9%81%8b%e7%ae%97%e7%ac%a6-WnQoDXevVP\">4. \u4f4d\u5143\u904b\u7b97\u7b26<\/h3>\n<p>\u4f4d\u5143\u904b\u7b97\u7b26\u7528\u65bc\u5c0d\u6574\u6578\u9032\u884c\u4f4d\u5143\u64cd\u4f5c\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>&amp;<\/code>\uff1a\u4f4d\u5143\u8207<\/li>\n<li><code>|<\/code>\uff1a\u4f4d\u5143\u6216<\/li>\n<li><code>^<\/code>\uff1a\u4f4d\u5143\u7570\u6216<\/li>\n<li><code>~<\/code>\uff1a\u4f4d\u5143\u975e<\/li>\n<li><code>&lt;&lt;<\/code>\uff1a\u5de6\u79fb<\/li>\n<li><code>&gt;&gt;<\/code>\uff1a\u53f3\u79fb<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u904b\u7b97\u7b26\u5728\u8655\u7406\u4e8c\u9032\u5236\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\u4e2d\u4f7f\u7528\u8f03\u5c11\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e6%af%94%e8%bc%83%e5%8a%9f%e8%83%bd%e7%9a%84%e6%87%89%e7%94%a8-WnQoDXevVP\">\u6578\u64da\u6bd4\u8f03\u529f\u80fd\u7684\u61c9\u7528<\/h2>\n<p>MySQL\u7684\u904b\u7b97\u7b26\u4e0d\u50c5\u9650\u65bc\u57fa\u672c\u7684\u6578\u64da\u67e5\u8a62\uff0c\u9084\u53ef\u4ee5\u7528\u65bc\u66f4\u8907\u96dc\u7684\u6578\u64da\u6bd4\u8f03\u548c\u5206\u6790\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u548c\u806f\u63a5\u53ef\u4ee5\u7372\u5f97\u66f4\u6df1\u5165\u7684\u6578\u64da\u6d1e\u5bdf\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u4f8b\u5b50\uff0c\u67e5\u8a62\u6240\u6709\u50f9\u683c\u9ad8\u65bc\u5e73\u5747\u50f9\u683c\u7684\u7522\u54c1\uff1a<\/p>\n<pre><code>SELECT * FROM products WHERE price &gt; (SELECT AVG(price) FROM products);<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u4f7f\u7528\u806f\u63a5\u53ef\u4ee5\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u9032\u884c\u6bd4\u8f03\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u6240\u6709\u8a02\u55ae\u53ca\u5176\u5c0d\u61c9\u7684\u5ba2\u6236\u4fe1\u606f\uff1a<\/p>\n<pre><code>SELECT orders.id, customers.name FROM orders\nJOIN customers ON orders.customer_id = customers.id;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WnQoDXevVP\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u904b\u7b97\u7b26\uff0c\u5e6b\u52a9\u7528\u6236\u5728\u6578\u64da\u67e5\u8a62\u548c\u6bd4\u8f03\u4e2d\u7372\u5f97\u66f4\u7cbe\u78ba\u7684\u7d50\u679c\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u9019\u4e9b\u904b\u7b97\u7b26\uff0c\u7528\u6236\u53ef\u4ee5\u6709\u6548\u5730\u7be9\u9078\u548c\u5206\u6790\u6578\u64da\uff0c\u5f9e\u800c\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u904b\u7b97\u7b26\u53ca\u5176\u6bd4\u8f03\u529f\u80fd\uff0c\u4e86\u89e3\u5982\u4f55\u7372\u53d6\u66f4\u76f8\u95dc\u7684\u6578\u64da\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6e96\u78ba\u6027\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-77620","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77620","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=77620"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77620\/revisions"}],"predecessor-version":[{"id":77621,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77620\/revisions\/77621"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}