{"id":5487,"date":"2024-11-14T12:35:48","date_gmt":"2024-11-14T04:35:48","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5487\/"},"modified":"2024-11-14T12:35:48","modified_gmt":"2024-11-14T04:35:48","slug":"mysql%e6%80%8e%e4%b9%88%e5%a2%9e%e5%8a%a0%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5487\/","title":{"rendered":"mysql\u600e\u4e48\u589e\u52a0\u7d22\u5f15"},"content":{"rendered":"<blockquote><p>\n  \u5982\u4f55\u4e3a mysql \u8868\u6dfb\u52a0\u7d22\u5f15\uff1f\u4f7f\u7528 alter table \u8a9e\u6cd5\uff0c\u6307\u5b9a\u7d22\u5f15\u540d\u79f0\u548c\u5305\u542b\u7684\u5217\u3002\u5728\u9891\u7e41\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u6216\u8fde\u63a5\u7279\u5b9a\u5217\u65f6\u6dfb\u52a0\u7d22\u5f15\u3002mysql \u63d0\u4f9b b-\u6811\u3001\u54c8\u5e0c\u548c\u5168\u6587\u7d22\u5f15\u7c7b\u578b\uff0c\u6839\u636e\u67e5\u8be2\u6a21\u5f0f\u9009\u62e9\u5408\u9002\u7684\u7c7b\u578b\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/29\/2024052904002912869.jpg\" class=\"aligncenter\" title=\"mysql\u600e\u4e48\u589e\u52a0\u7d22\u5f15\u63d2\u56fe\" alt=\"mysql\u600e\u4e48\u589e\u52a0\u7d22\u5f15\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4e3a MySQL \u8868\u589e\u52a0\u7d22\u5f15<\/strong><\/p>\n<p>\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u63d0\u5347\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u7684\u67e5\u8be2\u6027\u80fd\u3002\u901a\u8fc7\u4f7f\u7528\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u5728\u4e0d\u5fc5\u626b\u63cf\u6574\u4e2a\u8868\u7684\u60c5\u51b5\u4e0b\u5feb\u901f\u67e5\u627e\u6570\u636e\u3002<\/p>\n<p><strong>\u5982\u4f55\u589e\u52a0\u7d22\u5f15<\/strong><\/p>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u4e3a MySQL \u8868\u589e\u52a0\u7d22\u5f15\uff1a<\/p>\n<pre>ALTER TABLE table_name ADD INDEX index_name (column_name1, column_name2, ...);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<ul>\n<li>table_name \u662f\u60a8\u8981\u4e3a\u5176\u589e\u52a0\u7d22\u5f15\u7684\u8868\u540d\u79f0\u3002<\/li>\n<li>index_name \u662f\u60a8\u8981\u521b\u5efa\u7684\u7d22\u5f15\u7684\u540d\u79f0\u3002<\/li>\n<li>column_name1\u3001column_name2 \u7b49\u662f\u5305\u542b\u5728\u7d22\u5f15\u4e2d\u7684\u5217\u7684\u540d\u79f0\u3002<\/li>\n<\/ul>\n<p><strong>\u4f55\u65f6\u589e\u52a0\u7d22\u5f15<\/strong><\/p>\n<p>\u60a8\u5e94\u8be5\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u4e3a\u8868\u589e\u52a0\u7d22\u5f15\uff1a<\/p>\n<ul>\n<li>\u5f53\u60a8\u7ecf\u5e38\u67e5\u8be2\u8868\u4e2d\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u65f6\u3002<\/li>\n<li>\u5f53\u60a8\u6839\u636e\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u5bf9\u8868\u8fdb\u884c\u6392\u5e8f\u6216\u5206\u7ec4\u65f6\u3002<\/li>\n<li>\u5f53\u60a8\u4f7f\u7528 JOIN \u64cd\u4f5c\u5c06\u591a\u4e2a\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u65f6\u3002<\/li>\n<\/ul>\n<p><strong>\u7d22\u5f15\u7c7b\u578b<\/strong><\/p>\n<p>MySQL \u652f\u6301\u591a\u79cd\u7d22\u5f15\u7c7b\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li> <strong>B-\u6811\u7d22\u5f15\uff1a<\/strong>\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u5c06\u6570\u636e\u7ec4\u7ec7\u6210\u5e73\u8861\u7684\u6811\u72b6\u7ed3\u6784\u3002<\/li>\n<li> <strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u5c06\u6570\u636e\u5b58\u50a8\u5728\u54c8\u5e0c\u8868\u4e2d\uff0c\u5141\u8bb8\u5feb\u901f\u67e5\u627e\u3002<\/li>\n<li> <strong>\u5168\u6587\u7d22\u5f15\uff1a<\/strong>\u7528\u4e8e\u5bf9\u6587\u672c\u6570\u636e\u8fdb\u884c\u5168\u6587\u641c\u7d22\u3002<\/li>\n<\/ul>\n<p><strong>\u9009\u62e9\u5408\u9002\u7684\u7d22\u5f15<\/strong><\/p>\n<p>\u9009\u62e9\u6b63\u786e\u7684\u7d22\u5f15\u7c7b\u578b\u53d6\u51b3\u4e8e\u60a8\u7684\u67e5\u8be2\u6a21\u5f0f\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u60c5\u51b5\uff0cB-\u6811\u7d22\u5f15\u662f\u4e0d\u9519\u7684\u9009\u62e9\u3002\u5bf9\u4e8e\u4e3b\u952e\u5217\u6216\u7ecf\u5e38\u4f7f\u7528\u7684\u552f\u4e00\u5217\uff0c\u54c8\u5e0c\u7d22\u5f15\u53ef\u80fd\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong>\u5728\u4e3a\u8868\u589e\u52a0\u7d22\u5f15\u4e4b\u524d\uff0c\u8bf7\u4ed4\u7ec6\u8003\u8651\u5176\u4f18\u7f3a\u70b9\u3002\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u5b83\u4eec\u4e5f\u4f1a\u589e\u52a0\u8868\u7684\u5b58\u50a8\u7a7a\u95f4\u5e76\u964d\u4f4e\u66f4\u65b0\u901f\u5ea6\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u589e\u52a0\u7d22\u5f15\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4e3a mysql \u8868\u6dfb\u52a0\u7d22\u5f15\uff1f\u4f7f\u7528 alter table \u8a9e\u6cd5\uff0c\u6307\u5b9a\u7d22\u5f15\u540d\u79f0\u548c\u5305\u542b\u7684\u5217\u3002\u5728\u9891\u7e41\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u6216\u8fde\u63a5\u7279\u5b9a\u5217\u65f6\u6dfb\u52a0\u7d22\u5f15\u3002mysql \u63d0\u4f9b b-\u6811\u3001\u54c8\u5e0c\u548c\u5168\u6587\u7d22\u5f15\u7c7b\u578b\uff0c\u6839\u636e\u67e5\u8be2\u6a21\u5f0f\u9009\u62e9\u5408\u9002\u7684\u7c7b\u578b\u3002 \u5982\u4f55\u4e3a MySQL \u8868\u589e\u52a0\u7d22\u5f15 \u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u63d0\u5347\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u7684\u67e5\u8be2\u6027\u80fd\u3002\u901a\u8fc7\u4f7f\u7528\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u5728\u4e0d\u5fc5\u626b\u63cf\u6574\u4e2a\u8868\u7684\u60c5\u51b5\u4e0b\u5feb\u901f\u67e5\u627e\u6570\u636e\u3002 \u5982\u4f55\u589e\u52a0\u7d22\u5f15 \u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u4e3a MySQL \u8868\u589e\u52a0\u7d22\u5f15\uff1a ALTER TABLE table_name ADD INDEX index_name (column_name1, column_name2, &#8230;); \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a table_name \u662f\u60a8\u8981\u4e3a\u5176\u589e\u52a0\u7d22\u5f15\u7684\u8868\u540d\u79f0\u3002 index_name \u662f\u60a8\u8981\u521b\u5efa\u7684\u7d22\u5f15\u7684\u540d\u79f0\u3002 column_name1\u3001column_name2 \u7b49\u662f\u5305\u542b\u5728\u7d22\u5f15\u4e2d\u7684\u5217\u7684\u540d\u79f0\u3002 \u4f55\u65f6\u589e\u52a0\u7d22\u5f15 \u60a8\u5e94\u8be5\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u4e3a\u8868\u589e\u52a0\u7d22\u5f15\uff1a \u5f53\u60a8\u7ecf\u5e38\u67e5\u8be2\u8868\u4e2d\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u65f6\u3002 \u5f53\u60a8\u6839\u636e\u7279\u5b9a\u5217\u6216\u4e00\u7ec4\u5217\u5bf9\u8868\u8fdb\u884c\u6392\u5e8f\u6216\u5206\u7ec4\u65f6\u3002 \u5f53\u60a8\u4f7f\u7528 JOIN \u64cd\u4f5c\u5c06\u591a\u4e2a\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u65f6\u3002 \u7d22\u5f15\u7c7b\u578b MySQL \u652f\u6301\u591a\u79cd\u7d22\u5f15\u7c7b\u578b\uff0c\u5305\u62ec\uff1a B-\u6811\u7d22\u5f15\uff1a\u6700\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u5b83\u5c06\u6570\u636e\u7ec4\u7ec7\u6210\u5e73\u8861\u7684\u6811\u72b6\u7ed3\u6784\u3002 \u54c8\u5e0c\u7d22\u5f15\uff1a\u5c06\u6570\u636e\u5b58\u50a8\u5728\u54c8\u5e0c\u8868\u4e2d\uff0c\u5141\u8bb8\u5feb\u901f\u67e5\u627e\u3002 \u5168\u6587\u7d22\u5f15\uff1a\u7528\u4e8e\u5bf9\u6587\u672c\u6570\u636e\u8fdb\u884c\u5168\u6587\u641c\u7d22\u3002 \u9009\u62e9\u5408\u9002\u7684\u7d22\u5f15 \u9009\u62e9\u6b63\u786e\u7684\u7d22\u5f15\u7c7b\u578b\u53d6\u51b3\u4e8e\u60a8\u7684\u67e5\u8be2\u6a21\u5f0f\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u60c5\u51b5\uff0cB-\u6811\u7d22\u5f15\u662f\u4e0d\u9519\u7684\u9009\u62e9\u3002\u5bf9\u4e8e\u4e3b\u952e\u5217\u6216\u7ecf\u5e38\u4f7f\u7528\u7684\u552f\u4e00\u5217\uff0c\u54c8\u5e0c\u7d22\u5f15\u53ef\u80fd\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002 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