{"id":3124,"date":"2024-04-09T15:38:31","date_gmt":"2024-04-09T07:38:31","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3124"},"modified":"2024-12-14T21:53:18","modified_gmt":"2024-12-14T13:53:18","slug":"mysql%e7%b4%a2%e5%bc%95%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bc%98%e5%8c%96%e6%95%b0%e6%8d%ae%e5%ba%93%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3124","title":{"rendered":"MySQL\u7d22\u5f15\u8be6\u89e3\uff1a\u4f18\u5316\u6570\u636e\u5e93\u67e5\u8be2"},"content":{"rendered":"\n<p>\u4f5c\u4e3aJava\u5f00\u53d1\u4eba\u5458\uff0c\u4e86\u89e3\u6570\u636e\u5e93\u7d22\u5f15\u5bf9\u4e8e\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002MySQL\u4f5c\u4e3a\u4e00\u79cd\u5e38\u7528\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5176\u7d22\u5f15\u673a\u5236\u5bf9\u4e8e\u63d0\u5347\u67e5\u8be2\u6548\u7387\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u6df1\u5165\u4ecb\u7ecdMySQL\u7d22\u5f15\u7684\u539f\u7406\u3001\u6570\u636e\u7ed3\u6784\u3001\u7c7b\u578b\u3001\u4f7f\u7528\u573a\u666f\u4ee5\u53ca\u6ce8\u610f\u4e8b\u9879\uff0c\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u8fd0\u7528\u7d22\u5f15\u6765\u4f18\u5316\u4f60\u7684\u6570\u636e\u5e93\u67e5\u8be2\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001\u7d22\u5f15\u539f\u7406<\/h5>\n\n\n\n<p>MySQL\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6570\u636e\u3002\u5b83\u7c7b\u4f3c\u4e8e\u4e66\u7c4d\u7684\u76ee\u5f55\uff0c\u53ef\u4ee5\u52a0\u5feb\u67e5\u8be2\u901f\u5ea6\uff0c\u907f\u514d\u5168\u8868\u626b\u63cf\u3002\u7d22\u5f15\u901a\u8fc7\u7ef4\u62a4\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u4f7f\u5f97\u6570\u636e\u5e93\u7cfb\u7edf\u80fd\u591f\u5feb\u901f\u5730\u5b9a\u4f4d\u5230\u7b26\u5408\u67e5\u8be2\u6761\u4ef6\u7684\u6570\u636e\u884c\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001\u7d22\u5f15\u6570\u636e\u7ed3\u6784<\/h5>\n\n\n\n<p>MySQL\u652f\u6301\u591a\u79cd\u7d22\u5f15\u6570\u636e\u7ed3\u6784\uff0c\u5305\u62ecB-Tree\u3001Hash\u7d22\u5f15\u7b49\uff0c\u5176\u4e2dB-Tree\u662f\u6700\u5e38\u7528\u7684\u4e00\u79cd\u3002B-Tree\u7d22\u5f15\u662f\u4e00\u79cd\u5e73\u8861\u6811\u7ed3\u6784\uff0c\u901a\u8fc7\u5c06\u7d22\u5f15\u952e\u503c\u6309\u7167\u4e00\u5b9a\u89c4\u5219\u5b58\u50a8\u5728\u6811\u8282\u70b9\u4e2d\uff0c\u5b9e\u73b0\u5feb\u901f\u67e5\u627e\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001\u7d22\u5f15\u7c7b\u578b\u4ecb\u7ecd<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u5355\u5217\u7d22\u5f15<\/h6>\n\n\n\n<p>\u5355\u5217\u7d22\u5f15\u662f\u6700\u57fa\u672c\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u53ea\u5305\u542b\u5355\u4e2a\u5217\u7684\u503c\u3002\u4f18\u70b9\u662f\u7b80\u5355\u9ad8\u6548\uff0c\u9002\u7528\u4e8e\u7b49\u503c\u67e5\u8be2\u548c\u8303\u56f4\u67e5\u8be2\uff0c\u4f46\u5728\u6d89\u53ca\u591a\u5217\u67e5\u8be2\u65f6\u6027\u80fd\u53ef\u80fd\u4e0d\u4f73\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u591a\u5217\u7d22\u5f15<\/h6>\n\n\n\n<p>\u591a\u5217\u7d22\u5f15\u5305\u542b\u591a\u4e2a\u5217\u7684\u503c\uff0c\u53ef\u4ee5\u52a0\u901f\u6d89\u53ca\u591a\u4e2a\u5217\u7684\u67e5\u8be2\u3002\u4f18\u70b9\u662f\u80fd\u591f\u6ee1\u8db3\u591a\u79cd\u67e5\u8be2\u6761\u4ef6\uff0c\u4f46\u8981\u6ce8\u610f\u7d22\u5f15\u5217\u7684\u987a\u5e8f\uff0c\u5c3d\u91cf\u5c06\u6700\u5e38\u7528\u7684\u5217\u653e\u5728\u524d\u9762\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u552f\u4e00\u7d22\u5f15<\/h6>\n\n\n\n<p>\u552f\u4e00\u7d22\u5f15\u4fdd\u8bc1\u7d22\u5f15\u5217\u7684\u503c\u552f\u4e00\uff0c\u7528\u4e8e\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u548c\u907f\u514d\u91cd\u590d\u6570\u636e\u7684\u63d2\u5165\u3002\u4f46\u662f\u5728\u7ef4\u62a4\u552f\u4e00\u6027\u65b9\u9762\u4f1a\u589e\u52a0\u989d\u5916\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">4. \u7ec4\u5408\u7d22\u5f15<\/h6>\n\n\n\n<p>\u7ec4\u5408\u7d22\u5f15\u662f\u5305\u542b\u591a\u4e2a\u5217\u7684\u7d22\u5f15\uff0c\u4f46\u4e0d\u540c\u4e8e\u591a\u5217\u7d22\u5f15\u7684\u662f\uff0c\u7ec4\u5408\u7d22\u5f15\u4e2d\u7684\u6bcf\u4e2a\u5217\u90fd\u4e0d\u662f\u552f\u4e00\u7684\u3002\u5b83\u80fd\u591f\u52a0\u901f\u6d89\u53ca\u7ec4\u5408\u6761\u4ef6\u7684\u67e5\u8be2\uff0c\u4f46\u8981\u6ce8\u610f\u7d22\u5f15\u5217\u7684\u9009\u62e9\u548c\u987a\u5e8f\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001\u7d22\u5f15\u4f7f\u7528\u573a\u666f<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. WHERE\u5b50\u53e5\u4e2d\u7684\u6761\u4ef6\u5217<\/h6>\n\n\n\n<p>\u5f53\u4f60\u5728\u67e5\u8be2\u8bed\u53e5\u7684WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u6761\u4ef6\u5217\u8fdb\u884c\u7b5b\u9009\u65f6\uff0c\u7d22\u5f15\u4f1a\u53d1\u6325\u4f5c\u7528\u3002\u4f8b\u5982\uff1a<\/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-868988bdd19550122b50bf74309883a1\"><code>SELECT * FROM users WHERE username = 'john';\n<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">2. ORDER BY\u5b50\u53e5\u4e2d\u7684\u6392\u5e8f\u5217<\/h6>\n\n\n\n<p>\u5982\u679c\u4f60\u5728\u67e5\u8be2\u8bed\u53e5\u4e2d\u4f7f\u7528ORDER BY\u5b50\u53e5\u5bf9\u67d0\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f\uff0c\u7d22\u5f15\u540c\u6837\u4f1a\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u4f8b\u5982\uff1a<\/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-3a43e0e3bbcfbada9bce9ecca3b093da\"><code>SELECT * FROM products ORDER BY price DESC;\n<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">3. JOIN\u5b50\u53e5\u4e2d\u7684\u8fde\u63a5\u5217<\/h6>\n\n\n\n<p>\u5f53\u4f60\u5728\u67e5\u8be2\u8bed\u53e5\u4e2d\u4f7f\u7528JOIN\u5b50\u53e5\u8fdb\u884c\u8868\u8fde\u63a5\u65f6\uff0c\u8fde\u63a5\u5217\u7684\u7d22\u5f15\u4f1a\u5e2e\u52a9\u52a0\u901f\u67e5\u8be2\u3002\u4f8b\u5982\uff1a<\/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-6184673f43c59a32f73f8ebf8b9413e5\"><code>SELECT * FROM orders o JOIN customers c ON o.customer_id = c.id;\n<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e94\u3001\u7d22\u5f15\u521b\u5efa\u65b9\u5f0f<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u4f7f\u7528CREATE INDEX\u8bed\u53e5<\/h6>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528<code>CREATE INDEX<\/code>\u8bed\u53e5\u6765\u624b\u52a8\u521b\u5efa\u7d22\u5f15\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/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-e55f8780bbd6f86cda96bf3cc0c57284\"><code>CREATE INDEX index_name ON table_name (column_name);\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c<code>index_name<\/code>\u662f\u7d22\u5f15\u7684\u540d\u79f0\uff0c<code>table_name<\/code>\u662f\u8981\u521b\u5efa\u7d22\u5f15\u7684\u8868\u540d\uff0c<code>column_name<\/code>\u662f\u8981\u521b\u5efa\u7d22\u5f15\u7684\u5217\u540d\u3002\u4f8b\u5982\uff0c\u8981\u5728\u540d\u4e3a<code>users<\/code>\u7684\u8868\u7684<code>username<\/code>\u5217\u4e0a\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a<code>username_index<\/code>\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/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-46a25ec131535a7c0d76718977beeea5\"><code>CREATE INDEX username_index ON users (username);\n<\/code><\/pre>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u4f7f\u7528ALTER TABLE\u8bed\u53e5<\/h6>\n\n\n\n<p>\u53e6\u4e00\u79cd\u521b\u5efa\u7d22\u5f15\u7684\u65b9\u5f0f\u662f\u4f7f\u7528<code>ALTER TABLE<\/code>\u8bed\u53e5\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/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-ce4234985e11f0463f5d98db2d712715\"><code>ALTER TABLE table_name ADD INDEX index_name (column_name);\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u79cd\u65b9\u5f0f\u4e0e<code>CREATE INDEX<\/code>\u7c7b\u4f3c\uff0c\u4f46\u662f\u53ef\u4ee5\u5728\u5df2\u5b58\u5728\u7684\u8868\u4e0a\u6dfb\u52a0\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u8981\u5728\u540d\u4e3a<code>products<\/code>\u7684\u8868\u7684<code>price<\/code>\u5217\u4e0a\u6dfb\u52a0\u4e00\u4e2a\u540d\u4e3a<code>price_index<\/code>\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/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-a23f712a41d8857d602ad0936cfdd32c\"><code>ALTER TABLE products ADD INDEX price_index (price);\n<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u516d\u3001\u7d22\u5f15\u662f\u5426\u751f\u6548\u68c0\u6d4b\u65b9\u6cd5<\/h5>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7EXPLAIN\u8bed\u53e5\u6765\u5206\u6790\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u5224\u65ad\u7d22\u5f15\u662f\u5426\u751f\u6548\u3002\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff1a<\/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-fa2e7f7fcb3de03f5b6cdfbac1cd5d20\"><code>EXPLAIN SELECT * FROM users WHERE username = 'john';\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u5728Extra\u5217\u4e2d\u770b\u5230&#8221;Using index&#8221;\u6216&#8221;Using where; Using index&#8221;\uff0c\u8868\u793a\u7d22\u5f15\u751f\u6548\uff1b\u5982\u679c\u770b\u5230&#8221;Using where&#8221;\uff0c\u8868\u793a\u7d22\u5f15\u672a\u751f\u6548\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e03\u3001\u7d22\u5f15\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u8fc7\u5ea6\u7d22\u5f15<\/strong>\uff1a\u4e0d\u8981\u4e3a\u8868\u4e2d\u7684\u6bcf\u4e2a\u5217\u90fd\u521b\u5efa\u7d22\u5f15\uff0c\u8fc7\u591a\u7684\u7d22\u5f15\u4f1a\u589e\u52a0\u7ef4\u62a4\u6210\u672c\u548c\u6027\u80fd\u5f00\u9500\u3002<\/li>\n\n\n\n<li><strong>\u5b9a\u671f\u7ef4\u62a4\u7d22\u5f15<\/strong>\uff1a\u5bf9\u4e8e\u9891\u7e41\u66f4\u65b0\u7684\u8868\uff0c\u5b9a\u671f\u91cd\u65b0\u6784\u5efa\u7d22\u5f15\u53ef\u4ee5\u4fdd\u6301\u7d22\u5f15\u7684\u9ad8\u6548\u6027\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u610f\u7d22\u5f15\u5217\u987a\u5e8f<\/strong>\uff1a\u5c06\u6700\u5e38\u7528\u7684\u5217\u653e\u5728\u7d22\u5f15\u7684\u524d\u9762\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n\n\n\n<li><strong>\u8c28\u614e\u4f7f\u7528\u7d22\u5f15\u63d0\u793a<\/strong>\uff1a\u867d\u7136\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u63d0\u793a\u6765\u5f3a\u5236\u4f7f\u7528\u67d0\u4e2a\u7d22\u5f15\uff0c\u4f46\u8981\u6ce8\u610f\u53ef\u80fd\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u4e3aJava\u5f00\u53d1\u4eba\u5458\uff0c\u4e86\u89e3\u6570\u636e\u5e93\u7d22\u5f15\u5bf9\u4e8e\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002MySQL\u4f5c\u4e3a\u4e00\u79cd\u5e38\u7528\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb 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