{"id":3270,"date":"2024-06-19T15:11:11","date_gmt":"2024-06-19T07:11:11","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3270"},"modified":"2024-12-07T17:23:51","modified_gmt":"2024-12-07T09:23:51","slug":"mysql%e7%b4%a2%e5%bc%95%e6%8f%90%e5%8d%87%e6%9f%a5%e8%af%a2%e6%80%a7%e8%83%bd%e7%9a%84%e4%b8%93%e4%b8%9a%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3270","title":{"rendered":"MySQL\u7d22\u5f15\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u7684\u4e13\u4e1a\u6280\u5de7"},"content":{"rendered":"\n<p>MySQL\u7d22\u5f15\u662f\u63d0\u5347\u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002\u6b63\u786e\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6570\u636e\u68c0\u7d22\u7684\u901f\u5ea6\uff0c\u4f46\u9519\u8bef\u4f7f\u7528\u6216\u7ba1\u7406\u4e0d\u5f53\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u63a2\u8ba8MySQL\u7d22\u5f15\u7684\u5e94\u7528\u573a\u666f\u3001\u5982\u4f55\u67e5\u770b\u7d22\u5f15\u662f\u5426\u751f\u6548\u3001\u901a\u8fc7\u67e5\u8be2\u7ed3\u679c\u4e86\u89e3\u7d22\u5f15\u4f5c\u7528\u8303\u56f4\u3001\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\u53ca\u6b63\u786e\u5229\u7528\u7d22\u5f15\u7684\u7b56\u7565\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001\u7d22\u5f15\u7684\u5e94\u7528\u573a\u666f<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u4e3b\u952e\u7d22\u5f15<\/h6>\n\n\n\n<p>\u4e3b\u952e\u7d22\u5f15\u662f\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u7528\u4e8e\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u8bb0\u5f55\u3002\u521b\u5efa\u8868\u65f6\u901a\u5e38\u4f1a\u5b9a\u4e49\u4e3b\u952e\u7d22\u5f15\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-bc74235b9f4ceabd816fd8ef414a49ff\"><code>CREATE TABLE users (\n    id INT PRIMARY KEY,\n    name VARCHAR(255),\n    email VARCHAR(255)\n);<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u552f\u4e00\u7d22\u5f15<\/h6>\n\n\n\n<p>\u552f\u4e00\u7d22\u5f15\u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u9002\u7528\u4e8e\u9700\u8981\u552f\u4e00\u7ea6\u675f\u7684\u5b57\u6bb5\uff0c\u5982\u90ae\u7bb1\u5730\u5740\u3001\u7528\u6237\u540d\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-4bdc5f4fb3625ba912edbd7afacda1c1\"><code>CREATE UNIQUE INDEX idx_email ON users(email);<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u666e\u901a\u7d22\u5f15<\/h6>\n\n\n\n<p>\u666e\u901a\u7d22\u5f15\u7528\u4e8e\u52a0\u901f\u5bf9\u975e\u552f\u4e00\u5217\u7684\u67e5\u8be2\uff0c\u9002\u7528\u4e8e\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\u7684\u5b57\u6bb5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-dba1f220bc74fa3a3ddb2453e4974daa\"><code>CREATE INDEX idx_name ON users(name);<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">4. \u590d\u5408\u7d22\u5f15<\/h6>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\u5305\u542b\u591a\u4e2a\u5217\uff0c\u9002\u7528\u4e8e\u9700\u8981\u540c\u65f6\u5728\u591a\u4e2a\u5217\u4e0a\u8fdb\u884c\u67e5\u8be2\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-9c0f8c1b13df23cf9151c2df39c61985\"><code>CREATE INDEX idx_name_email ON users(name, email);<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">5. \u5168\u6587\u7d22\u5f15<\/h6>\n\n\n\n<p>\u5168\u6587\u7d22\u5f15\u7528\u4e8e\u52a0\u901f\u5bf9\u6587\u672c\u5b57\u6bb5\u7684\u5168\u6587\u641c\u7d22\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u6587\u672c\u5185\u5bb9\u8fdb\u884c\u68c0\u7d22\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-720ef5e525974f2aab35c6026fdebd1b\"><code>CREATE FULLTEXT INDEX idx_content ON articles(content);<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001\u5982\u4f55\u67e5\u770b\u7d22\u5f15\u662f\u5426\u751f\u6548<\/h5>\n\n\n\n<p>\u4f7f\u7528 <code>EXPLAIN<\/code> \u5173\u952e\u5b57\u53ef\u4ee5\u67e5\u770b\u67e5\u8be2\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u4ee5\u53ca\u4f7f\u7528\u4e86\u54ea\u4e9b\u7d22\u5f15\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-565eab0301fe6e4e497aa39ed9d6a959\"><code>EXPLAIN SELECT * FROM users WHERE email = 'example@example.com';<\/code><\/pre>\n\n\n\n<p><code>EXPLAIN<\/code> \u8f93\u51fa\u4e2d\u6700\u91cd\u8981\u7684\u5b57\u6bb5\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>type<\/code>\uff1a\u663e\u793a\u67e5\u8be2\u7c7b\u578b\uff0c<code>ALL<\/code> \u8868\u793a\u5168\u8868\u626b\u63cf\uff0c<code>index<\/code> \u8868\u793a\u7d22\u5f15\u626b\u63cf\u3002<\/li>\n\n\n\n<li><code>possible_keys<\/code>\uff1a\u53ef\u80fd\u4f7f\u7528\u7684\u7d22\u5f15\u3002<\/li>\n\n\n\n<li><code>key<\/code>\uff1a\u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15\u3002<\/li>\n\n\n\n<li><code>rows<\/code>\uff1a\u626b\u63cf\u7684\u884c\u6570\uff0c\u503c\u8d8a\u5c0f\u8d8a\u597d\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u901a\u8fc7\u5206\u6790 <code>EXPLAIN<\/code> \u8f93\u51fa\uff0c\u53ef\u4ee5\u4e86\u89e3\u7d22\u5f15\u5728\u67e5\u8be2\u4e2d\u7684\u4f5c\u7528\u8303\u56f4\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c <code>type<\/code> \u663e\u793a\u4e3a <code>index<\/code> \u6216 <code>range<\/code>\uff0c\u8bf4\u660e\u7d22\u5f15\u8d77\u5230\u4e86\u4f5c\u7528\u3002<\/li>\n\n\n\n<li>\u5982\u679c <code>type<\/code> \u663e\u793a\u4e3a <code>ALL<\/code>\uff0c\u8bf4\u660e\u67e5\u8be2\u8fdb\u884c\u4e86\u5168\u8868\u626b\u63cf\uff0c\u7d22\u5f15\u672a\u8d77\u4f5c\u7528\uff0c\u9700\u8981\u4f18\u5316\u67e5\u8be2\u6216\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001\u7d22\u5f15\u5728\u54ea\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u5931\u6548<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u4e0d\u4f7f\u7528\u5de6\u524d\u7f00<\/h6>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\u5728\u67e5\u8be2\u65f6\u5fc5\u987b\u4f7f\u7528\u6700\u5de6\u524d\u5217\uff0c\u5426\u5219\u7d22\u5f15\u4f1a\u5931\u6548\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e <code>(name, email)<\/code> \u7684\u590d\u5408\u7d22\u5f15\uff0c\u67e5\u8be2\u5fc5\u987b\u5305\u542b <code>name<\/code> \u5217\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-5db2e8deac0489a3e6a4aa5986be98b4\"><code>-- \u7d22\u5f15\u751f\u6548\nSELECT * FROM users WHERE name = 'John' AND email = 'john@example.com';\n\n-- \u7d22\u5f15\u5931\u6548\nSELECT * FROM users WHERE email = 'john@example.com';<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u4f7f\u7528\u51fd\u6570\u6216\u8ba1\u7b97<\/h6>\n\n\n\n<p>\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u51fd\u6570\u6216\u8ba1\u7b97\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-25b04da3af48b8c8354065a591e88bf4\"><code>-- \u7d22\u5f15\u5931\u6548\nSELECT * FROM users WHERE LEFT(name, 3) = 'Joh';<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/h6>\n\n\n\n<p>\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u6bd4\u8f83\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u5982\u5b57\u7b26\u4e32\u4e0e\u6574\u6570\u6bd4\u8f83\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-063387b29b887467e8396502587988d6\"><code>-- \u7d22\u5f15\u5931\u6548\nSELECT * FROM users WHERE id = '123';<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">4. \u4f7f\u7528\u901a\u914d\u7b26\u5f00\u5934\u7684LIKE\u67e5\u8be2<\/h6>\n\n\n\n<p>\u5728 <code>LIKE<\/code> \u67e5\u8be2\u4e2d\u4f7f\u7528\u901a\u914d\u7b26\u5f00\u5934\uff08<code>%<\/code>\uff09\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-140c6b7455aaa303335bb7daca6a430d\"><code>-- \u7d22\u5f15\u5931\u6548\nSELECT * FROM users WHERE name LIKE '%ohn';<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001\u5982\u4f55\u6b63\u786e\u5229\u7528\u597d\u7d22\u5f15<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u5408\u7406\u521b\u5efa\u7d22\u5f15<\/h6>\n\n\n\n<p>\u6839\u636e\u67e5\u8be2\u9700\u6c42\u521b\u5efa\u5408\u9002\u7684\u7d22\u5f15\uff0c\u907f\u514d\u521b\u5efa\u8fc7\u591a\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u867d\u80fd\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u4e5f\u4f1a\u589e\u52a0\u5199\u64cd\u4f5c\u7684\u5f00\u9500\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u5b9a\u671f\u7ef4\u62a4\u7d22\u5f15<\/h6>\n\n\n\n<p>\u5b9a\u671f\u91cd\u5efa\u548c\u5206\u6790\u7d22\u5f15\uff0c\u786e\u4fdd\u7d22\u5f15\u7edf\u8ba1\u4fe1\u606f\u7684\u51c6\u786e\u6027\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-872a08d3f3a4ede8ae5599ff3823e77e\"><code>-- \u5206\u6790\u7d22\u5f15\nANALYZE TABLE users;<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u4f7f\u7528\u8986\u76d6\u7d22\u5f15<\/h6>\n\n\n\n<p>\u8986\u76d6\u7d22\u5f15\u662f\u6307\u67e5\u8be2\u6240\u9700\u7684\u5b57\u6bb5\u90fd\u5305\u542b\u5728\u7d22\u5f15\u4e2d\uff0c\u907f\u514d\u56de\u8868\u67e5\u8be2\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">4. \u76d1\u63a7\u67e5\u8be2\u6027\u80fd<\/h6>\n\n\n\n<p>\u4f7f\u7528MySQL\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\uff0c\u5982 <code>SHOW PROFILES<\/code> \u548c\u6162\u67e5\u8be2\u65e5\u5fd7\uff0c\u76d1\u63a7\u548c\u5206\u6790\u67e5\u8be2\u6027\u80fd\uff0c\u53ca\u65f6\u4f18\u5316\u7d22\u5f15\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-c8ee6ffa3760b27f76a566a74bd4151f\"><code>-- \u5f00\u542f\u6162\u67e5\u8be2\u65e5\u5fd7\nSET GLOBAL slow_query_log = 'ON';\nSET GLOBAL long_query_time = 1;\n\n-- \u67e5\u770b\u6162\u67e5\u8be2\u65e5\u5fd7\nSHOW VARIABLES LIKE 'slow_query_log_file';<\/code><\/pre>\n\n\n\n<p>\u6b63\u786e\u4f7f\u7528MySQL\u7d22\u5f15\u662f\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\u7684\u5173\u952e\u3002\u901a\u8fc7\u4e86\u89e3\u7d22\u5f15\u7684\u5e94\u7528\u573a\u666f\uff0c\u638c\u63e1\u67e5\u770b\u7d22\u5f15\u662f\u5426\u751f\u6548\u7684\u65b9\u6cd5\uff0c\u4e86\u89e3\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\uff0c\u5e76\u6b63\u786e\u5229\u7528\u548c\u7ef4\u62a4\u7d22\u5f15\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6548\u7387\u548c\u6574\u4f53\u6027\u80fd\u3002\u901a\u8fc7\u4e0a\u8ff0\u7b56\u7565\uff0c\u60a8\u53ef\u4ee5\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6709\u6548\u5730\u7ba1\u7406\u548c\u4f18\u5316MySQL\u7d22\u5f15\uff0c\u786e\u4fdd\u6570\u636e\u5e93\u7684\u9ad8\u6548\u8fd0\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u7d22\u5f15\u662f\u63d0\u5347\u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002\u6b63\u786e\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6570\u636e\u68c0\u7d22\u7684\u901f\u5ea6\uff0c\u4f46\u9519\u8bef\u4f7f\u7528\u6216\u7ba1\u7406\u4e0d\u5f53\u53ef\u80fd [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[156],"tags":[390,134],"class_list":["post-3270","post","type-post","status-publish","format-standard","hentry","category-156","tag-mysql","tag-134"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MySQL\u7d22\u5f15\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u7684\u4e13\u4e1a\u6280\u5de7<\/title>\n<meta name=\"description\" content=\"\u672c\u6587\u5c06\u8be6\u7ec6\u63a2\u8ba8MySQL\u7d22\u5f15\u7684\u5e94\u7528\u573a\u666f\u3001\u5982\u4f55\u67e5\u770b\u7d22\u5f15\u662f\u5426\u751f\u6548\u3001\u901a\u8fc7\u67e5\u8be2\u7ed3\u679c\u4e86\u89e3\u7d22\u5f15\u4f5c\u7528\u8303\u56f4\u3001\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\u53ca\u6b63\u786e\u5229\u7528\u7d22\u5f15\u7684\u7b56\u7565\u3002\" \/>\n<meta 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