{"id":463,"date":"2024-12-22T14:18:34","date_gmt":"2024-12-22T06:18:34","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=463"},"modified":"2024-12-22T14:18:34","modified_gmt":"2024-12-22T06:18:34","slug":"%e5%9c%a8-mysql-%e4%b8%ad%ef%bc%8c%e5%bb%ba%e7%ab%8b%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8%e5%9c%ba%e6%99%af%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%8c%e9%83%bd%e9%9c%80%e8%a6%81%e6%b3%a8%e6%84%8f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/22\/%e5%9c%a8-mysql-%e4%b8%ad%ef%bc%8c%e5%bb%ba%e7%ab%8b%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8%e5%9c%ba%e6%99%af%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%8c%e9%83%bd%e9%9c%80%e8%a6%81%e6%b3%a8%e6%84%8f\/","title":{"rendered":"\u5728 MySQL \u4e2d\uff0c\u5efa\u7acb\u7d22\u5f15\u7684\u4f7f\u7528\u573a\u666f\u6709\u54ea\u4e9b\uff0c\u90fd\u9700\u8981\u6ce8\u610f\u4ec0\u4e48\uff1f"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5927\u6570\u636e\u91cf\u65f6\u3002\u7406\u89e3\u4f55\u65f6\u4f7f\u7528\u7d22\u5f15\u3001\u5982\u4f55\u521b\u5efa\u7d22\u5f15\uff0c\u4ee5\u53ca\u521b\u5efa\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879\uff0c\u5bf9\u4e8e\u63d0\u5347\u6570\u636e\u5e93\u6027\u80fd\u548c\u4fdd\u8bc1\u67e5\u8be2\u6548\u7387\u81f3\u5173\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u5173\u4e8e\u00a0<strong>\u5efa\u7acb\u7d22\u5f15\u7684\u4f7f\u7528\u573a\u666f<\/strong>\u00a0\u548c\u00a0<strong>\u521b\u5efa\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879<\/strong>\u00a0\u7684\u8be6\u7ec6\u8bf4\u660e\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e00\u3001<strong>\u5efa\u7acb\u7d22\u5f15\u7684\u4f7f\u7528\u573a\u666f<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u662f\u6570\u636e\u5e93\u4e2d\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u7684\u91cd\u8981\u624b\u6bb5\u3002\u5728 SQL \u67e5\u8be2\u4e2d\uff0c\u5c24\u5176\u662f\u6d89\u53ca\u5230\u5927\u6570\u636e\u91cf\u7684\u8868\u65f6\uff0c\u5408\u9002\u7684\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u52a0\u901f\u6570\u636e\u68c0\u7d22\u3002<strong>\u5efa\u7acb\u7d22\u5f15\u7684\u4f7f\u7528\u573a\u666f<\/strong>\u4e00\u822c\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. <strong>\u67e5\u8be2\u4e2d\u7ecf\u5e38\u4f7f\u7528\u7684\u5b57\u6bb5<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>WHERE \u5b50\u53e5\u4e2d\u7684\u6761\u4ef6\u5217<\/strong>\uff1a\u7ecf\u5e38\u7528\u4f5c\u8fc7\u6ee4\u6761\u4ef6\u7684\u5217\uff0c\u6bd4\u5982\u5e38\u5e38\u51fa\u73b0\u5728 <code>WHERE<\/code>\u3001<code>JOIN<\/code>\u3001<code>ORDER BY<\/code> \u4e2d\u7684\u5b57\u6bb5\u3002\u6bd4\u5982\uff0c\u4f60\u7ecf\u5e38\u901a\u8fc7\u67d0\u4e2a\u5b57\u6bb5\uff08\u5982 <code>id<\/code>\u3001<code>username<\/code> \u7b49\uff09\u6765\u7b5b\u9009\u6570\u636e\uff0c\u8fd9\u65f6\u5c31\u5e94\u8be5\u8003\u8651\u4e3a\u8fd9\u4e9b\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u67e5\u8be2\u67d0\u4e2a\u7528\u6237\u7684\u8ba2\u5355\u65f6\uff0c\u901a\u8fc7 <code>user_id<\/code> \u6765\u7b5b\u9009\u6240\u6709\u8ba2\u5355\u3002<br><code>sql SELECT * FROM orders WHERE user_id = 123;<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. <strong>\u8054\u63a5\u64cd\u4f5c\u4e2d\u7684\u5217<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>JOIN \u64cd\u4f5c\u7684\u8fde\u63a5\u5b57\u6bb5<\/strong>\uff1a\u5bf9\u4e8e\u6d89\u53ca\u5230\u8868\u8054\u63a5\uff08<code>JOIN<\/code>\uff09\u7684\u67e5\u8be2\uff0c\u5e94\u8be5\u5728\u8fde\u63a5\u7684\u5b57\u6bb5\u4e0a\u521b\u5efa\u7d22\u5f15\u3002\u4f8b\u5982\uff0c<code>INNER JOIN<\/code> \u6216 <code>LEFT JOIN<\/code> \u4e2d\u7ecf\u5e38\u7528\u4f5c\u8fde\u63a5\u6761\u4ef6\u7684\u5b57\u6bb5\uff0c\u521b\u5efa\u7d22\u5f15\u80fd\u591f\u63d0\u5347\u8054\u63a5\u6548\u7387\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u67e5\u8be2\u7528\u6237\u8ba2\u5355\u4fe1\u606f\u65f6\u901a\u8fc7 <code>user_id<\/code> \u4e0e <code>users<\/code> \u8868\u8fde\u63a5\u3002<br><code>sql SELECT * FROM users u INNER JOIN orders o ON u.user_id = o.user_id WHERE u.status = 'active';<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. <strong>\u6392\u5e8f\u64cd\u4f5c\u4e2d\u7684\u5217<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ORDER BY \u4e2d\u7684\u5217<\/strong>\uff1a\u5f53\u67e5\u8be2\u6d89\u53ca\u5230\u6392\u5e8f\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u8003\u8651\u4e3a\u6392\u5e8f\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\u3002\u7279\u522b\u662f\u5728\u5927\u6570\u636e\u96c6\u4e0b\uff0c\u6392\u5e8f\u64cd\u4f5c\u53ef\u80fd\u4f1a\u975e\u5e38\u8017\u65f6\uff0c\u7d22\u5f15\u80fd\u591f\u52a0\u901f\u6392\u5e8f\u7684\u8fc7\u7a0b\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u67e5\u8be2\u7528\u6237\u6309\u6ce8\u518c\u65f6\u95f4\u6392\u5e8f\u3002<br><code>sql SELECT * FROM users ORDER BY registration_date DESC;<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. <strong>\u8303\u56f4\u67e5\u8be2\u4e2d\u7684\u5217<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8303\u56f4\u67e5\u8be2\uff08\u5982 BETWEEN\u3001>\u3001&lt;\u3001>=\u3001&lt;=\uff09\u4e2d\u7684\u5217<\/strong>\uff1a\u5f53\u67e5\u8be2\u4f7f\u7528\u4e86\u8303\u56f4\u67e5\u8be2\u65f6\uff08\u4f8b\u5982\u67e5\u8be2\u67d0\u4e2a\u65e5\u671f\u8303\u56f4\u5185\u7684\u6570\u636e\uff09\uff0c\u4e3a\u8be5\u5217\u521b\u5efa\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u67e5\u8be2\u67d0\u4e2a\u65f6\u95f4\u6bb5\u5185\u7684\u8ba2\u5355\u3002<br><code>sql SELECT * FROM orders WHERE order_date BETWEEN '2024-01-01' AND '2024-12-31';<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">5. <strong>\u552f\u4e00\u6027\u7ea6\u675f\u6216\u4e3b\u952e<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u552f\u4e00\u7ea6\u675f\uff08UNIQUE\uff09\u548c\u4e3b\u952e\uff08PRIMARY KEY\uff09<\/strong>\uff1a\u521b\u5efa\u552f\u4e00\u7ea6\u675f\u6216\u4e3b\u952e\u65f6\uff0c\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u4e3a\u8be5\u5217\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u552f\u4e00\u6027\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a<code>id<\/code> \u5217\u901a\u5e38\u662f\u4e3b\u952e\uff0c\u5b83\u4f1a\u81ea\u52a8\u5efa\u7acb\u7d22\u5f15\u3002<br><code>sql CREATE TABLE users ( user_id INT PRIMARY KEY, username VARCHAR(255) UNIQUE );<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">6. <strong>\u5168\u6587\u68c0\u7d22<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5168\u6587\u7d22\u5f15<\/strong>\uff1a\u5bf9\u4e8e\u9700\u8981\u8fdb\u884c\u5168\u6587\u68c0\u7d22\u7684\u5b57\u6bb5\uff08\u6bd4\u5982\u6587\u7ae0\u5185\u5bb9\u3001\u5546\u54c1\u63cf\u8ff0\u7b49\uff09\uff0cMySQL \u63d0\u4f9b\u4e86 <strong>FULLTEXT<\/strong> \u7d22\u5f15\uff0c\u53ef\u4ee5\u5728\u6587\u672c\u5b57\u6bb5\u4e0a\u5efa\u7acb\uff0c\u4ee5\u52a0\u901f\u6587\u672c\u641c\u7d22\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u5728 <code>articles<\/code> \u8868\u7684 <code>content<\/code> \u5217\u4e0a\u521b\u5efa\u5168\u6587\u7d22\u5f15\uff0c\u8fdb\u884c\u5168\u6587\u641c\u7d22\u3002<br><code>sql CREATE INDEX idx_fulltext_content ON articles (content);<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">7. <strong>\u805a\u5408\u64cd\u4f5c<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>GROUP BY \u548c HAVING<\/strong>\uff1a\u5982\u679c\u67e5\u8be2\u4e2d\u6d89\u53ca <code>GROUP BY<\/code> \u64cd\u4f5c\uff0c\u4e14\u67e5\u8be2\u7684\u6570\u636e\u91cf\u8f83\u5927\uff0c\u53ef\u4ee5\u5728\u5206\u7ec4\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u63d0\u5347\u5206\u7ec4\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u6309 <code>category<\/code> \u5206\u7ec4\uff0c\u7edf\u8ba1\u6bcf\u4e2a\u5206\u7c7b\u7684\u8ba2\u5355\u6570\u3002<br><code>sql SELECT category, COUNT(*) FROM orders GROUP BY category;<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e8c\u3001<strong>\u521b\u5efa\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\u7d22\u5f15\u53ef\u4ee5\u63d0\u5347\u67e5\u8be2\u6548\u7387\uff0c\u4f46\u4e0d\u5f53\u4f7f\u7528\u4e5f\u53ef\u80fd\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u8d1f\u62c5\u3002\u521b\u5efa\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. <strong>\u907f\u514d\u4e3a\u4f4e\u9009\u62e9\u6027\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f4e\u9009\u62e9\u6027\u5b57\u6bb5<\/strong>\uff08\u5982\u6027\u522b\u3001\u5e03\u5c14\u7c7b\u578b\u3001\u72b6\u6001\u5b57\u6bb5\u7b49\uff09\u7684\u7d22\u5f15\u6548\u679c\u6709\u9650\uff0c\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u67e5\u8be2\u7684\u6027\u80fd\u63d0\u5347\u4e0d\u5927\uff0c\u53cd\u800c\u4f1a\u589e\u52a0\u5b58\u50a8\u7a7a\u95f4\u548c\u5199\u64cd\u4f5c\u7684\u6210\u672c\u3002\u7d22\u5f15\u9002\u5408\u9009\u62e9\u6027\u9ad8\u7684\u5b57\u6bb5\uff0c\u5373\u5b57\u6bb5\u4e2d\u5177\u6709\u5927\u91cf\u4e0d\u540c\u503c\u7684\u60c5\u51b5\u3002<\/li>\n\n\n\n<li>\u4f8b\u5982\uff0c<code>gender<\/code> \u5b57\u6bb5\u901a\u5e38\u53ea\u6709\u4e24\u79cd\u503c\uff08<code>male<\/code>\u3001<code>female<\/code>\uff09\uff0c\u8fd9\u79cd\u4f4e\u9009\u62e9\u6027\u7684\u5b57\u6bb5\u4e0d\u9002\u5408\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. <strong>\u907f\u514d\u5728\u9891\u7e41\u66f4\u65b0\u7684\u5b57\u6bb5\u4e0a\u521b\u5efa\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u6b21\u5bf9\u8868\u8fdb\u884c <strong>\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664<\/strong> \u64cd\u4f5c\u65f6\uff0c\u6570\u636e\u5e93\u90fd\u9700\u8981\u66f4\u65b0\u7d22\u5f15\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u7d22\u5f15\u5b57\u6bb5\u7ecf\u5e38\u66f4\u65b0\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u7279\u522b\u662f\u5728\u9700\u8981\u9891\u7e41\u5199\u5165\u6570\u636e\u7684\u573a\u666f\u4e0b\uff0c\u8981\u8c28\u614e\u9009\u62e9\u7d22\u5f15\u5b57\u6bb5\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u5982\u679c\u67d0\u4e2a\u5217\u7ecf\u5e38\u66f4\u65b0\uff08\u4f8b\u5982\uff0c<code>status<\/code> \u5b57\u6bb5\uff09\uff0c\u5219\u4e0d\u5efa\u8bae\u4e3a\u8be5\u5217\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. <strong>\u7d22\u5f15\u8fc7\u591a\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u7ba1\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u4f46\u8fc7\u591a\u7684\u7d22\u5f15\u4f1a\u589e\u52a0 <strong>\u5199\u5165\u64cd\u4f5c<\/strong> \u7684\u5f00\u9500\uff0c\u56e0\u4e3a\u6bcf\u6b21\u6570\u636e\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u65f6\uff0c\u7d22\u5f15\u4e5f\u9700\u8981\u88ab\u66f4\u65b0\u3002\u5982\u679c\u8868\u7684\u8bfb\u5199\u6bd4\u4f8b\u4e0d\u5e73\u8861\uff0c\u8fc7\u591a\u7684\u7d22\u5f15\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n\n\n\n<li>\u4f18\u5316\u5efa\u8bae\uff1a\u5408\u7406\u9009\u62e9\u7d22\u5f15\uff0c\u907f\u514d\u8fc7\u591a\u521b\u5efa\u4e0d\u5fc5\u8981\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. <strong>\u8054\u5408\u7d22\u5f15\u7684\u987a\u5e8f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8e <strong>\u8054\u5408\u7d22\u5f15<\/strong>\uff08\u4e00\u4e2a\u7d22\u5f15\u5305\u542b\u591a\u4e2a\u5217\uff09\uff0c\u7d22\u5f15\u7684\u987a\u5e8f\u975e\u5e38\u91cd\u8981\u3002\u8054\u5408\u7d22\u5f15\u7684\u987a\u5e8f\u5e94\u8be5\u9075\u5faa\u67e5\u8be2\u4e2d <strong>WHERE \u5b50\u53e5<\/strong> \u4e2d\u7684\u5217\u987a\u5e8f\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u7d22\u5f15\u5e94\u6309\u7167\u67e5\u8be2\u4e2d\u5217\u7684\u987a\u5e8f\u6765\u521b\u5efa\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u5982\u679c\u67e5\u8be2\u7ecf\u5e38\u6309 <code>(column1, column2)<\/code> \u8fdb\u884c\u8fc7\u6ee4\u6216\u6392\u5e8f\uff0c\u5219\u5e94\u8be5\u4e3a <code>(column1, column2)<\/code> \u521b\u5efa\u8054\u5408\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a<br><code>sql CREATE INDEX idx_column1_column2 ON table_name (column1, column2);<\/code><br>\u8be5\u7d22\u5f15\u80fd\u591f\u52a0\u901f\u5982\u4e0b\u67e5\u8be2\uff1a<br><code>sql SELECT * FROM table_name WHERE column1 = ? AND column2 = ?;<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">5. <strong>\u4f7f\u7528\u7d22\u5f15\u65f6\u7684\u8986\u76d6\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8986\u76d6\u7d22\u5f15<\/strong> \u662f\u6307\u67e5\u8be2\u6240\u9700\u7684\u6240\u6709\u5217\u90fd\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u6765\u83b7\u53d6\uff0c\u800c\u4e0d\u9700\u8981\u8bbf\u95ee\u6570\u636e\u8868\u7684\u5b9e\u9645\u6570\u636e\u884c\u3002\u8bbe\u8ba1\u5408\u9002\u7684\u7d22\u5f15\u53ef\u4ee5\u6709\u6548\u907f\u514d\u5168\u8868\u626b\u63cf\uff0c\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a\u5982\u679c\u67e5\u8be2\u53ea\u6d89\u53ca <code>name<\/code> \u548c <code>age<\/code> \u4e24\u5217\uff0c\u800c\u8fd9\u4e9b\u5217\u90fd\u88ab\u5305\u542b\u5728\u7d22\u5f15\u4e2d\uff0c\u90a3\u4e48\u67e5\u8be2\u5c31\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u83b7\u53d6\u6570\u636e\uff0c\u800c\u65e0\u9700\u8bbf\u95ee\u8868\u7684\u5b9e\u9645\u6570\u636e\u3002<br><code>sql CREATE INDEX idx_name_age ON users (name, age);<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">6. <strong>\u76d1\u63a7\u548c\u5206\u6790\u7d22\u5f15\u7684\u4f7f\u7528<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 MySQL \u7684 <strong><code>EXPLAIN<\/code><\/strong> \u8bed\u53e5\u5206\u6790\u67e5\u8be2\u8ba1\u5212\uff0c\u68c0\u67e5\u67e5\u8be2\u662f\u5426\u5229\u7528\u4e86\u7d22\u5f15\uff0c\u4ee5\u53ca\u7d22\u5f15\u7684\u9009\u62e9\u6027\u548c\u6548\u7387\u3002<\/li>\n\n\n\n<li>\u793a\u4f8b\uff1a<br><code>sql EXPLAIN SELECT * FROM orders WHERE user_id = 123;<\/code><\/li>\n\n\n\n<li>\u901a\u8fc7\u5206\u6790 <code>EXPLAIN<\/code> \u7684\u8f93\u51fa\uff0c\u53ef\u4ee5\u5e2e\u52a9\u4f60\u4e86\u89e3\u67e5\u8be2\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u5e76\u8fdb\u4e00\u6b65\u4f18\u5316\u7d22\u5f15\u7b56\u7565\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">7. <strong>\u8003\u8651\u6570\u636e\u5e93\u7248\u672c\u548c\u5b58\u50a8\u5f15\u64ce\u7684\u5dee\u5f02<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u540c\u7248\u672c\u7684 MySQL \u548c\u4e0d\u540c\u5b58\u50a8\u5f15\u64ce\uff08\u5982 <strong>InnoDB<\/strong> \u548c <strong>MyISAM<\/strong>\uff09\u5bf9\u7d22\u5f15\u7684\u652f\u6301\u548c\u5b9e\u73b0\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0cInnoDB \u652f\u6301\u805a\u96c6\u7d22\u5f15\uff0c\u800c MyISAM \u652f\u6301\u5168\u6587\u7d22\u5f15\u3002\u5728\u521b\u5efa\u7d22\u5f15\u65f6\uff0c\u786e\u4fdd\u4e86\u89e3\u6240\u4f7f\u7528\u7684\u6570\u636e\u5e93\u7248\u672c\u548c\u5b58\u50a8\u5f15\u64ce\u7684\u7279\u70b9\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e09\u3001<strong>\u9762\u8bd5\u4e2d\u5982\u4f55\u56de\u7b54<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u95ee\u5230 <strong>\u201c\u5982\u4f55\u9009\u62e9\u5efa\u7acb\u7d22\u5f15\uff1f\u201d<\/strong> \u6216 <strong>\u201c\u521b\u5efa\u7d22\u5f15\u65f6\u5e94\u8be5\u6ce8\u610f\u4ec0\u4e48\uff1f\u201d<\/strong>\uff0c\u4f60\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u56de\u7b54\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9009\u62e9\u5408\u9002\u7684\u5217\u521b\u5efa\u7d22\u5f15<\/strong>\uff0c\u7279\u522b\u662f\u67e5\u8be2\u4e2d\u6d89\u53ca <code>WHERE<\/code>\u3001<code>JOIN<\/code>\u3001<code>ORDER BY<\/code>\u3001<code>GROUP BY<\/code> \u7684\u5217\u3002<\/li>\n\n\n\n<li><strong>\u907f\u514d\u8fc7\u591a\u521b\u5efa\u7d22\u5f15<\/strong>\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u7d22\u5f15\u90fd\u4f1a\u5e26\u6765\u78c1\u76d8\u7a7a\u95f4\u548c\u5199\u64cd\u4f5c\u7684\u989d\u5916\u5f00\u9500\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u7ec4\u5408\u7d22\u5f15\u65f6\u8981\u6ce8\u610f\u7d22\u5f15\u5217\u7684\u987a\u5e8f<\/strong>\uff0c\u5e76\u786e\u4fdd\u5b83\u4eec\u7b26\u5408\u67e5\u8be2\u4e2d\u6761\u4ef6\u7684\u987a\u5e8f\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8be2<\/strong>\uff0c\u786e\u4fdd\u7d22\u5f15\u5f97\u5230\u6709\u6548\u5229\u7528\u3002<\/li>\n\n\n\n<li><strong>\u5b9a\u671f\u7ef4\u62a4\u7d22\u5f15<\/strong>\uff0c\u4f8b\u5982\u5220\u9664\u5197\u4f59\u7d22\u5f15\u3001\u91cd\u5efa\u7d22\u5f15\u7b49\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d22\u5f15\u662f\u6570\u636e\u5e93\u4f18\u5316\u7684\u5229\u5668\uff0c\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u80fd\u591f\u6781\u5927\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u8fc7\u5ea6\u4f9d\u8d56\u7d22\u5f15\u6216\u8bbe\u8ba1\u4e0d\u5408\u7406\u7684\u7d22\u5f15\u5219\u53ef\u80fd\u5e26\u6765\u8d1f\u9762\u5f71\u54cd\u3002\u5728\u9762\u8bd5\u65f6\uff0c\u5c55\u793a\u5bf9\u7d22\u5f15\u8bbe\u8ba1\u7684\u7406\u89e3\uff0c\u4ee5\u53ca\u5982\u4f55\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u7d22\u5f15\uff0c\u80fd\u591f\u7ed9\u9762\u8bd5\u5b98\u7559\u4e0b\u6df1\u523b\u5370\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u8fd9\u4e9b\u5185\u5bb9\uff0c\u53ef\u4ee5\u5c55\u793a\u4f60\u5bf9\u7d22\u5f15\u7684\u7406\u89e3\uff0c\u4ee5\u53ca\u5982\u4f55\u5e73\u8861\u6027\u80fd\u548c\u8d44\u6e90\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5927\u6570\u636e\u91cf\u65f6\u3002\u7406\u89e3\u4f55\u65f6\u4f7f\u7528\u7d22\u5f15\u3001\u5982\u4f55\u521b\u5efa\u7d22\u5f15\uff0c\u4ee5\u53ca [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-463","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=463"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/463\/revisions"}],"predecessor-version":[{"id":464,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/463\/revisions\/464"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=463"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=463"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}