{"id":383,"date":"2020-12-05T13:37:14","date_gmt":"2020-12-05T05:37:14","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=383"},"modified":"2020-12-10T14:23:59","modified_gmt":"2020-12-10T06:23:59","slug":"mysql%e5%ad%a6%e4%b9%a0%e4%b8%8e%e5%ae%9e%e9%aa%8c%ef%bc%88%e4%ba%94%ef%bc%89-%e7%b4%a2%e5%bc%95%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/experiment\/mysqlexperiment\/383.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e94\uff09\u2014\u2014\u7d22\u5f15\u5b9e\u9a8c"},"content":{"rendered":"\n<h2>5.\u7d22\u5f15\u5b9e\u9a8c<\/h2>\n\n\n\n<h3>5.1\u7d22\u5f15\u7684\u5b9a\u4e49<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u200b \u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u5e93\u7ed3\u6784\uff0c\u7531\u6570\u636e\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\u7ec4\u5408\u800c\u6210\uff0c\u53ef\u4ee5\u7528\u6765\u5feb\u901f\u67e5\u8be2\u6570\u636e\u8868\u4e2d\u6709\u67d0\u4e00\u7279\u5b9a\u503c\u7684\u8bb0\u5f55\u3002<\/p><\/blockquote>\n\n\n\n<p>\u200b \u901a\u8fc7\u7d22\u5f15\uff0c\u67e5\u8be2\u6570\u636e\u65f6\u4e0d\u7528\u8bfb\u5b8c\u8bb0\u5f55\u7684\u6240\u6709\u4fe1\u606f\uff0c\u800c\u53ea\u662f\u67e5\u8be2\u7d22\u5f15\u5217\u3002\u5426\u5219\uff0c\u6570\u636e\u5e93\u7cfb\u7edf\u5c06\u8bfb\u53d6\u6bcf\u6761\u8bb0\u5f55\u7684\u6240\u6709\u4fe1\u606f\u8fdb\u884c\u5339\u914d\u3002<\/p>\n\n\n\n<p>\u200b \u53ef\u4ee5\u628a\u7d22\u5f15\u6bd4\u4f5c\u65b0\u534e\u5b57\u5178\u7684\u97f3\u5e8f\u8868\u3002\u4f8b\u5982\uff0c\u8981\u67e5\u201c\u5e93\u201d\u5b57\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u97f3\u5e8f\uff0c\u5c31\u9700\u8981\u4ece\u5b57\u5178\u7684 400 \u9875\u4e2d\u9010\u9875\u6765\u627e\u3002\u4f46\u662f\uff0c\u5982\u679c\u63d0\u53d6\u62fc\u97f3\u51fa\u6765\uff0c\u6784\u6210\u97f3\u5e8f\u8868\uff0c\u5c31\u53ea\u9700\u8981\u4ece 10 \u591a\u9875\u7684\u97f3\u5e8f\u8868\u4e2d\u76f4\u63a5\u67e5\u627e\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u5927\u5927\u8282\u7701\u65f6\u95f4\u3002 \u56e0\u6b64\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u5f88\u5927\u7a0b\u5ea6\u4e0a\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u67e5\u8be2\u901f\u5ea6\uff0c\u8fd8\u6709\u6548\u7684\u63d0\u9ad8\u4e86\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<h3>5.2\u4f7f\u7528\u7d22\u5f15\u7684\u4f18\u70b9<\/h3>\n\n\n\n<p>\u2460\u901a\u8fc7\u521b\u5efa\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u5e93\u8868\u4e2d\u6bcf\u4e00\u884c\u6570\u636e\u7684\u552f\u4e00\u6027\u3002<\/p>\n\n\n\n<p>\u2461\u53ef\u4ee5\u7ed9\u6240\u6709\u7684 MySQL \u5217\u7c7b\u578b\u8bbe\u7f6e\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u2462\u53ef\u4ee5\u5927\u5927\u52a0\u5feb\u6570\u636e\u7684\u67e5\u8be2\u901f\u5ea6\uff0c\u8fd9\u662f\u4f7f\u7528\u7d22\u5f15\u6700\u4e3b\u8981\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<p>\u2463\u5728\u5b9e\u73b0\u6570\u636e\u7684\u53c2\u8003\u5b8c\u6574\u6027\u65b9\u9762\u53ef\u4ee5\u52a0\u901f\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u3002<\/p>\n\n\n\n<p>\u2464\u5728\u4f7f\u7528\u5206\u7ec4\u548c\u6392\u5e8f\u5b50\u53e5\u8fdb\u884c\u6570\u636e\u67e5\u8be2\u65f6\u4e5f\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u67e5\u8be2\u4e2d\u5206\u7ec4\u548c\u6392\u5e8f\u7684\u65f6\u95f4<\/p>\n\n\n\n<h3>5.3\u4f7f\u7528\u7d22\u5f15\u7684\u7f3a\u70b9<\/h3>\n\n\n\n<p>\u2460\u521b\u5efa\u548c\u7ef4\u62a4\u7d22\u5f15\u7ec4\u8981\u8017\u8d39\u65f6\u95f4\uff0c\u5e76\u4e14\u968f\u7740\u6570\u636e\u91cf\u7684\u589e\u52a0\u6240\u8017\u8d39\u7684\u65f6\u95f4\u4e5f\u4f1a\u589e\u52a0\u3002<\/p>\n\n\n\n<p>\u2461\u7d22\u5f15\u9700\u8981\u5360\u78c1\u76d8\u7a7a\u95f4\uff0c\u9664\u4e86\u6570\u636e\u8868\u5360\u6570\u636e\u7a7a\u95f4\u4ee5\u5916\uff0c\u6bcf\u4e00\u4e2a\u7d22\u5f15\u8fd8\u8981\u5360\u4e00\u5b9a\u7684\u7269\u7406\u7a7a\u95f4\u3002\u5982\u679c\u6709\u5927\u91cf\u7684\u7d22\u5f15\uff0c\u7d22\u5f15\u6587\u4ef6\u53ef\u80fd\u6bd4\u6570\u636e\u6587\u4ef6\u66f4\u5feb\u8fbe\u5230\u6700\u5927\u6587\u4ef6\u5c3a\u5bf8\u3002<\/p>\n\n\n\n<p>\u2462\u5f53\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u548c\u4fee\u6539\u7684\u65f6\u5019\uff0c\u7d22\u5f15\u4e5f\u8981\u52a8\u6001\u7ef4\u62a4\uff0c\u8fd9\u6837\u5c31\u964d\u4f4e\u4e86\u6570\u636e\u7684\u7ef4\u62a4\u901f\u5ea6\u3002<\/p>\n\n\n\n<h3>5.4 MySQL \u4e2d\uff0c\u901a\u5e38\u6709\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\u8bbf\u95ee\u6570\u636e\u5e93\u8868\u7684\u884c\u6570\u636e<\/h3>\n\n\n\n<h4>5.4.1 \u987a\u5e8f\u8bbf\u95ee<\/h4>\n\n\n\n<p>\u200b \u987a\u5e8f\u8bbf\u95ee\u662f\u5728\u8868\u4e2d\u5b9e\u884c\u5168\u8868\u626b\u63cf\uff0c\u4ece\u5934\u5230\u5c3e\u9010\u884c\u904d\u5386\uff0c\u76f4\u5230\u5728\u65e0\u5e8f\u7684\u884c\u6570\u636e\u4e2d\u627e\u5230\u7b26\u5408\u6761\u4ef6\u7684\u76ee\u6807\u6570\u636e\u3002\u987a\u5e8f\u8bbf\u95ee\u5b9e\u73b0\u6bd4\u8f83\u7b80\u5355\uff0c\u4f46\u662f\u5f53\u8868\u4e2d\u6709\u5927\u91cf\u6570\u636e\u7684\u65f6\u5019\uff0c\u6548\u7387\u975e\u5e38\u4f4e\u4e0b\u3002\u4f8b\u5982\uff0c\u5728\u51e0\u5343\u4e07\u6761\u6570\u636e\u4e2d\u67e5\u627e\u5c11\u91cf\u7684\u6570\u636e\u65f6\uff0c\u4f7f\u7528\u987a\u5e8f\u8bbf\u95ee\u65b9\u5f0f\u5c06\u4f1a\u904d\u5386\u6240\u6709\u7684\u6570\u636e\uff0c\u82b1\u8d39\u5927\u91cf\u7684\u65f6\u95f4\uff0c\u663e\u7136\u4f1a\u5f71\u54cd\u6570\u636e\u5e93\u7684\u5904\u7406\u6027\u80fd\u3002<\/p>\n\n\n\n<h4>5.4.2\u7d22\u5f15\u8bbf\u95ee<\/h4>\n\n\n\n<p>\u200b \u7d22\u5f15\u8bbf\u95ee\u662f\u901a\u8fc7\u904d\u5386\u7d22\u5f15\u6765\u76f4\u63a5\u8bbf\u95ee\u8868\u4e2d\u8bb0\u5f55\u884c\u7684\u65b9\u5f0f\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u7684\u524d\u63d0\u662f\u5bf9\u8868\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff0c\u5728\u5217\u4e0a\u521b\u5efa\u4e86\u7d22\u5f15\u4e4b\u540e\uff0c\u67e5\u627e\u6570\u636e\u65f6\u53ef\u4ee5\u76f4\u63a5\u6839\u636e\u8be5\u5217\u4e0a\u7684\u7d22\u5f15\u627e\u5230\u5bf9\u5e94\u8bb0\u5f55\u884c\u7684\u4f4d\u7f6e\uff0c\u4ece\u800c\u5feb\u6377\u5730\u67e5\u627e\u5230\u6570\u636e\u3002\u7d22\u5f15\u5b58\u50a8\u4e86\u6307\u5b9a\u5217\u6570\u636e\u503c\u7684\u6307\u9488\uff0c\u6839\u636e\u6307\u5b9a\u7684\u6392\u5e8f\u987a\u5e8f\u5bf9\u8fd9\u4e9b\u6307\u9488\u6392\u5e8f\u3002<\/p>\n\n\n\n<p>\u200b \u4f8b\u5982\uff0c\u5728\u5b66\u751f\u57fa\u672c\u4fe1\u606f\u8868 tb_students \u4e2d\uff0c\u5982\u679c\u57fa\u4e8e student_id \u5efa\u7acb\u4e86\u7d22\u5f15\uff0c\u7cfb\u7edf\u5c31\u5efa\u7acb\u4e86\u4e00\u5f20\u7d22\u5f15\u5217\u5230\u5b9e\u9645\u8bb0\u5f55\u7684\u6620\u5c04\u8868\u3002\u5f53\u7528\u6237\u9700\u8981\u67e5\u627e student_id \u4e3a 12022 \u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u5148\u5728 student_id \u7d22\u5f15\u4e0a\u627e\u5230\u8be5\u8bb0\u5f55\uff0c\u7136\u540e\u901a\u8fc7\u6620\u5c04\u8868\u76f4\u63a5\u627e\u5230\u6570\u636e\u884c\uff0c\u5e76\u4e14\u8fd4\u56de\u8be5\u884c\u6570\u636e\u3002\u56e0\u4e3a\u626b\u63cf\u7d22\u5f15\u7684\u901f\u5ea6\u4e00\u822c\u8fdc\u8fdc\u5927\u4e8e\u626b\u63cf\u5b9e\u9645\u6570\u636e\u884c\u7684\u901f\u5ea6\uff0c\u6240\u4ee5\u91c7\u7528\u7d22\u5f15\u7684\u65b9\u5f0f\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u200b \u7b80\u800c\u8a00\u4e4b\uff0c\u4e0d\u4f7f\u7528\u7d22\u5f15\uff0cMySQL \u5c31\u5fc5\u987b\u4ece\u7b2c\u4e00\u6761\u8bb0\u5f55\u5f00\u59cb\u8bfb\u5b8c\u6574\u4e2a\u8868\uff0c\u76f4\u5230\u627e\u51fa\u76f8\u5173\u7684\u884c\u3002\u8868\u8d8a\u5927\uff0c\u67e5\u8be2\u6570\u636e\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u5c31\u8d8a\u591a\u3002\u5982\u679c\u8868\u4e2d\u67e5\u8be2\u7684\u5217\u6709\u4e00\u4e2a\u7d22\u5f15\uff0cMySQL \u5c31\u80fd\u5feb\u901f\u5230\u8fbe\u4e00\u4e2a\u4f4d\u7f6e\u53bb\u641c\u7d22\u6570\u636e\u6587\u4ef6\uff0c\u800c\u4e0d\u5fc5\u67e5\u770b\u6240\u6709\u6570\u636e\uff0c\u8fd9\u6837\u5c06\u4f1a\u8282\u7701\u5f88\u5927\u4e00\u90e8\u5206\u65f6\u95f4\u3002<\/p>\n\n\n\n<h3>5.5\u7d22\u5f15\u7c7b\u578b<\/h3>\n\n\n\n<h4>5.5.1B-TREE\u7d22\u5f15<\/h4>\n\n\n\n<p>\u2460\u666e\u901a\u7d22\u5f15(INDEX)\uff1a\u6700\u57fa\u672c\u7d22\u5f15\uff0c\u6ca1\u6709\u552f\u4e00\u6027\u9650\u5236<br>\u2461\u552f\u4e00\u6027\u7d22\u5f15(UNIQUE)\uff1a\u7d22\u5f15\u5217\u7684\u503c\u4e0d\u80fd\u91cd\u590d<br>\u2462\u4e3b\u952e(PRIMARY KEY)\uff1a\u521b\u5efa\u8868\u7684\u65f6\u5019\u6307\u5b9a\uff0c\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u4e3b\u952e\u7684\u503c\u4e0d\u53ef\u91cd\u590d\uff0c\u4e5f\u4e0d\u53ef\u4e3a\u7a7a\uff08NULL\uff09<\/p>\n\n\n\n<h4>5.5.2HASH\u7d22\u5f15\uff08\u5f53\u8868\u7c7b\u578b\u4e3aMEMORY\u6216HEAP\u65f6\u53ef\u7528\uff09<\/h4>\n\n\n\n<h2>\u521b\u5efa HASH\u7d22\u5f15<\/h2>\n\n\n\n<p>\u521b\u5efa\u4e00\u4e2a\u5305\u542b (employeeID, name, education) \u7b49\u5b57\u6bb5\u7684\u4e34\u65f6\u5458\u5de5\u8868(tmpEmployee)\uff0c\u5e76\u5728\u8be5\u8868\u7684\u5458\u5de5\u7f16\u53f7\u5b57\u6bb5\u4e0a\u521b\u5efa\u4e00\u4e2aHASH\u7d22\u5f15<\/p>\n\n\n\n<p>\u9996\u5148\u521b\u5efa\u8868\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>create table if not exists tmpEmployee(employeeID varchar(6) primary key\nnot null,name varchar(10) not null,education varhcar(10));<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u5efa\u7acb\u4e00\u4e2ahash\u7d22\u5f15\uff1acreate index \u7d22\u5f15\u540d using hash on \u8868\u540d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>create index in_hash using hash on tmpEmployee(employeeId);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120513311138.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120513311138.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>5.5.3R-TREE\u7d22\u5f15<\/h4>\n\n\n\n<p>\u200b MySQL\u652f\u6301\u5bf9\u7a7a\u95f4\u6570\u636e\u5e93\u8fdb\u884cR-TREE\u7d22\u5f15<\/p>\n\n\n\n<h3>5.6MySQL \u63d0\u4f9b\u4e86\u4e09\u79cd\u521b\u5efa\u7d22\u5f15\u7684\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<h4>5.6.1 \u4f7f\u7528 CREATE INDEX \u8bed\u53e5<\/h4>\n\n\n\n<p>\u200b \u53ef\u4ee5\u4f7f\u7528\u4e13\u95e8\u7528\u4e8e\u521b\u5efa\u7d22\u5f15\u7684 CREATE INDEX \u8bed\u53e5\u5728\u4e00\u4e2a\u5df2\u6709\u7684\u8868\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c<strong>\u4f46\u8be5\u8bed\u53e5\u4e0d\u80fd\u521b\u5efa\u4e3b\u952e<\/strong>\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE &lt;\u7d22\u5f15\u540d> ON &lt;\u8868\u540d> (&lt;\u5217\u540d> &#91;&lt;\u957f\u5ea6>] &#91; ASC | DESC])<\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u2460&lt;\u7d22\u5f15\u540d&gt;`\uff1a\u6307\u5b9a\u7d22\u5f15\u540d\u3002\u4e00\u4e2a\u8868\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a\u7d22\u5f15\uff0c\u4f46\u6bcf\u4e2a\u7d22\u5f15\u5728\u8be5\u8868\u4e2d\u7684\u540d\u79f0\u662f\u552f\u4e00\u7684\u3002<\/p><p>\u2461&lt;\u8868\u540d&gt;`\uff1a\u6307\u5b9a\u8981\u521b\u5efa\u7d22\u5f15\u7684\u8868\u540d\u3002<\/p><p>\u2462&lt;\u5217\u540d&gt;`\uff1a\u6307\u5b9a\u8981\u521b\u5efa\u7d22\u5f15\u7684\u5217\u540d\u3002\u901a\u5e38\u53ef\u4ee5\u8003\u8651\u5c06\u67e5\u8be2\u8bed\u53e5\u4e2d\u5728 JOIN \u5b50\u53e5\u548c WHERE \u5b50\u53e5\u91cc\u7ecf\u5e38\u51fa\u73b0\u7684\u5217\u4f5c\u4e3a\u7d22\u5f15\u5217\u3002<\/p><p>\u2463&lt;\u957f\u5ea6&gt;`\uff1a\u53ef\u9009\u9879\u3002\u6307\u5b9a\u4f7f\u7528\u5217\u524d\u7684 length \u4e2a\u5b57\u7b26\u6765\u521b\u5efa\u7d22\u5f15\u3002\u4f7f\u7528\u5217\u7684\u4e00\u90e8\u5206\u521b\u5efa\u7d22\u5f15\u6709\u5229\u4e8e\u51cf\u5c0f\u7d22\u5f15\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u8282\u7701\u7d22\u5f15\u5217\u6240\u5360\u7684\u7a7a\u95f4\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ea\u80fd\u5bf9\u5217\u7684\u524d\u7f00\u8fdb\u884c\u7d22\u5f15\u3002\u7d22\u5f15\u5217\u7684\u957f\u5ea6\u6709\u4e00\u4e2a\u6700\u5927\u4e0a\u9650 255 \u4e2a\u5b57\u8282\uff08MyISAM \u548c InnoDB \u8868\u7684\u6700\u5927\u4e0a\u9650\u4e3a 1000 \u4e2a\u5b57\u8282\uff09\uff0c\u5982\u679c\u7d22\u5f15\u5217\u7684\u957f\u5ea6\u8d85\u8fc7\u4e86\u8fd9\u4e2a\u4e0a\u9650\uff0c\u5c31\u53ea\u80fd\u7528\u5217\u7684\u524d\u7f00\u8fdb\u884c\u7d22\u5f15\u3002\u53e6\u5916\uff0cBLOB \u6216 TEXT \u7c7b\u578b\u7684\u5217\u4e5f\u5fc5\u987b\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u3002<\/p><p>\u2464ASC|DESC<code>\uff1a\u53ef\u9009\u9879\u3002<\/code>ASC<code>\u6307\u5b9a\u7d22\u5f15\u6309\u7167\u5347\u5e8f\u6765\u6392\u5217\uff0c<\/code>DESC<code>\u6307\u5b9a\u7d22\u5f15\u6309\u7167\u964d\u5e8f\u6765\u6392\u5217\uff0c\u9ed8\u8ba4\u4e3a<\/code>ASC`\u3002<\/p><\/blockquote>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5728employee\u8868\u7684name\u5217\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15in_employee<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX in_employee ON employee(name=);\nCREATE INDEX in_employee ON student( name asc);  #\u5347\u5e8f\u7d22\u5f15<\/code><\/pre>\n\n\n\n<p><strong>\u6ce8\uff1a\u53ef\u4ee5\u5728\u521b\u5efa\u8868\u7684\u540c\u65f6\u521b\u5efa\u7d22\u5f15<\/strong><\/p>\n\n\n\n<p>\u53ef\u4ee5\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> SHOW INDEX FROM  \u8868\u540d   <\/code><\/pre>\n\n\n\n<p>\u663e\u793a\u5df2\u7ecf\u521b\u5efa\u7684\u7d22\u5f15\u4fe1\u606f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>show index from employee;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205133148110.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205133148110.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120513314888.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120513314888.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120513314881.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120513314881.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>5.6.2\u4f7f\u7528 CREATE TABLE \u8bed\u53e5<\/h4>\n\n\n\n<p>\u7d22\u5f15\u4e5f\u53ef\u4ee5\u5728\u521b\u5efa\u8868\uff08CREATE TABLE\uff09\u7684\u540c\u65f6\u521b\u5efa\u3002\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u8bed\u53e5\u3002\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CONSTRAINT PRIMARY KEY &#91;\u7d22\u5f15\u7c7b\u578b] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u53e5\uff0c\u8868\u793a\u5728\u521b\u5efa\u65b0\u8868\u7684\u540c\u65f6\u521b\u5efa\u8be5\u8868\u7684\u4e3b\u952e\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>KEY | INDEX &#91;&lt;\u7d22\u5f15\u540d>] &#91;&lt;\u7d22\u5f15\u7c7b\u578b>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u53e5\uff0c\u8868\u793a\u5728\u521b\u5efa\u65b0\u8868\u7684\u540c\u65f6\u521b\u5efa\u8be5\u8868\u7684\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UNIQUE &#91; INDEX | KEY] &#91;&lt;\u7d22\u5f15\u540d>] &#91;&lt;\u7d22\u5f15\u7c7b\u578b>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u53e5\uff0c\u8868\u793a\u5728\u521b\u5efa\u65b0\u8868\u7684\u540c\u65f6\u521b\u5efa\u8be5\u8868\u7684\u552f\u4e00\u6027\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>FOREIGN KEY &lt;\u7d22\u5f15\u540d> &lt;\u5217\u540d><\/code><\/pre>\n\n\n\n<p>\u5728 CREATE TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u53e5\uff0c\u8868\u793a\u5728\u521b\u5efa\u65b0\u8868\u7684\u540c\u65f6\u521b\u5efa\u8be5\u8868\u7684\u5916\u952e\u3002<\/p>\n\n\n\n<p>\u200b <strong>\u5728\u4f7f\u7528 CREATE TABLE \u8bed\u53e5\u5b9a\u4e49\u5217\u9009\u9879\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u5728\u67d0\u4e2a\u5217\u5b9a\u4e49\u540e\u9762\u6dfb\u52a0 PRIMARY KEY \u7684\u65b9\u5f0f\u521b\u5efa\u4e3b\u952e\u3002\u800c\u5f53\u4e3b\u952e\u662f\u7531\u591a\u4e2a\u5217\u7ec4\u6210\u7684\u591a\u5217\u7d22\u5f15\u65f6\uff0c\u5219\u4e0d\u80fd\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u53ea\u80fd\u7528\u5728\u8bed\u53e5\u7684\u6700\u540e\u52a0\u4e0a\u4e00\u4e2a PRIMARY KRY(&lt;\u5217\u540d&gt;\uff0c\u2026) \u5b50\u53e5\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002<\/strong><\/p>\n\n\n\n<h5>5.6.2.1\u552f\u4e00\u7d22\u5f15\uff08unique\uff09:<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>create unique index in_name on employee (name);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205133251386.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205133251386.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>5.6.2.2\u521b\u5efa\u590d\u5408\u4e3b\u952e<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>create index in_employeeId_name on employee(employeID,name);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120513333767.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120513333767.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>5.6.2.3\u521b\u5efa\u8868\u7684\u65f6\u5019\u521b\u5efa\u7d22\u5f15<\/h5>\n\n\n\n<p>\u521b\u5efa\u4e0edepartment\u8868\u76f8\u540c\u7ed3\u6784\u7684\u8868department1\uff0c\u5e76\u5c06departName\u8bbe\u4e3a\u4e3b\u952e\uff0cdepartmentID\u4e0a\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15 \u3002<\/p>\n\n\n\n<p><strong>\u9996\u5148\u5efa\u7acb\u4e00\u4e2a\u8868department1\u8868\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE `department1` (\n\n  `departmentID` char(3 )  not null,\n\n  `departName` char(20)  NOT NULL,\n\n  `comment` varchar(100)  DEFAULT NULL,\n\n  PRIMARY KEY (`departName`)\n\n ) ENGINE=InnoDB DEFAULT CHARSET=gbk ;<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u7ed9department1\u8868\u6dfb\u52a0\u4e00\u4e2a\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>create index in_departmentId on department1(departmentID);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205133402134.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205133402134.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>5.6.3 \u4f7f\u7528 ALTER TABLE \u8bed\u53e5<\/h4>\n\n\n\n<p>CREATE INDEX \u8bed\u53e5\u53ef\u4ee5\u5728\u4e00\u4e2a\u5df2\u6709\u7684\u8868\u4e0a\u521b\u5efa\u7d22\u5f15\uff0cALTER TABLE \u8bed\u53e5\u4e5f\u53ef\u4ee5\u5728\u4e00\u4e2a\u5df2\u6709\u7684\u8868\u4e0a\u521b\u5efa\u7d22\u5f15\u3002\u5728\u4f7f\u7528 ALTER TABLE \u8bed\u53e5\u4fee\u6539\u8868\u7684\u540c\u65f6\uff0c\u53ef\u4ee5\u5411\u5df2\u6709\u7684\u8868\u6dfb\u52a0\u7d22\u5f15\u3002\u5177\u4f53\u7684\u505a\u6cd5\u662f\u5728 ALTER TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u8bed\u6cd5\u6210\u5206\u7684\u67d0\u4e00\u9879\u6216\u51e0\u9879\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ADD INDEX &#91;&lt;\u7d22\u5f15\u540d>] &#91;&lt;\u7d22\u5f15\u7c7b\u578b>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 ALTER TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u6cd5\u6210\u5206\uff0c\u8868\u793a\u5728\u4fee\u6539\u8868\u7684\u540c\u65f6\u4e3a\u8be5\u8868\u6dfb\u52a0\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ADD PRIMARY KEY &#91;&lt;\u7d22\u5f15\u7c7b\u578b>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 ALTER TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u6cd5\u6210\u5206\uff0c\u8868\u793a\u5728\u4fee\u6539\u8868\u7684\u540c\u65f6\u4e3a\u8be5\u8868\u6dfb\u52a0\u4e3b\u952e\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ADD UNIQUE &#91; INDEX | KEY] &#91;&lt;\u7d22\u5f15\u540d>] &#91;&lt;\u7d22\u5f15\u7c7b\u578b>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 ALTER TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u6cd5\u6210\u5206\uff0c\u8868\u793a\u5728\u4fee\u6539\u8868\u7684\u540c\u65f6\u4e3a\u8be5\u8868\u6dfb\u52a0\u552f\u4e00\u6027\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ADD FOREIGN KEY &#91;&lt;\u7d22\u5f15\u540d>] (&lt;\u5217\u540d>,\u2026)<\/code><\/pre>\n\n\n\n<p>\u5728 ALTER TABLE \u8bed\u53e5\u4e2d\u6dfb\u52a0\u6b64\u8bed\u6cd5\u6210\u5206\uff0c\u8868\u793a\u5728\u4fee\u6539\u8868\u7684\u540c\u65f6\u4e3a\u8be5\u8868\u6dfb\u52a0\u5916\u952e\u3002<\/p>\n\n\n\n<h3>5.7\u67e5\u770b\u7d22\u5f15<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>SHOW INDEX FROM &lt;\u8868\u540d> &#91; FROM &lt;\u6570\u636e\u5e93\u540d>]<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p><p>\u2460&lt;\u8868\u540d&gt;\uff1a\u6307\u5b9a\u9700\u8981\u67e5\u770b\u7d22\u5f15\u7684\u6570\u636e\u8868\u540d\u3002<\/p><p>\u2461&lt;\u6570\u636e\u5e93\u540d&gt;\uff1a\u6307\u5b9a\u9700\u8981\u67e5\u770b\u7d22\u5f15\u7684\u6570\u636e\u8868\u6240\u5728\u7684\u6570\u636e\u5e93\uff0c\u53ef\u7701\u7565\u3002\u6bd4\u5982\uff0cSHOW INDEX FROM student FROM test; \u8bed\u53e5\u8868\u793a\u67e5\u770b test \u6570\u636e\u5e93\u4e2d student \u6570\u636e\u8868\u7684\u7d22\u5f15\u3002<\/p><\/blockquote>\n\n\n\n<h3>5.8\u5220\u9664\u7d22\u5f15<\/h3>\n\n\n\n<p>\u5f53\u4e0d\u518d\u9700\u8981\u7d22\u5f15\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 DROP INDEX \u8bed\u53e5\u6216 ALTER TABLE \u8bed\u53e5\u6765\u5bf9\u7d22\u5f15\u8fdb\u884c\u5220\u9664\u3002<\/p>\n\n\n\n<h4>5.8.1 \u4f7f\u7528 DROP INDEX \u8bed\u53e5<\/h4>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DROP INDEX &lt;\u7d22\u5f15\u540d> ON &lt;\u8868\u540d><\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u2460&lt;\u7d22\u5f15\u540d&gt;`\uff1a\u8981\u5220\u9664\u7684\u7d22\u5f15\u540d\u3002<\/p><p>\u2461&lt;\u8868\u540d&gt;`\uff1a\u6307\u5b9a\u8be5\u7d22\u5f15\u6240\u5728\u7684\u8868\u540d\u3002<\/p><\/blockquote>\n\n\n\n<h4>5.8.2\u4f7f\u7528 ALTER TABLE \u8bed\u53e5<\/h4>\n\n\n\n<p>\u200b \u6839\u636e ALTER TABLE \u8bed\u53e5\u7684\u8bed\u6cd5\u53ef\u77e5\uff0c\u8be5\u8bed\u53e5\u4e5f\u53ef\u4ee5\u7528\u4e8e\u5220\u9664\u7d22\u5f15\u3002\u5177\u4f53\u4f7f\u7528\u65b9\u6cd5\u662f\u5c06 ALTER TABLE \u8bed\u53e5\u7684\u8bed\u6cd5\u4e2d\u90e8\u5206\u6307\u5b9a\u4e3a\u4ee5\u4e0b\u5b50\u53e5\u4e2d\u7684\u67d0\u4e00\u9879\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u2460DROP PRIMARY KEY\uff1a\u8868\u793a\u5220\u9664\u8868\u4e2d\u7684\u4e3b\u952e\u3002\u4e00\u4e2a\u8868\u53ea\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u4e3b\u952e\u4e5f\u662f\u4e00\u4e2a\u7d22\u5f15\u3002<\/p><p>\u2461DROP INDEX index_name\uff1a\u8868\u793a\u5220\u9664\u540d\u79f0\u4e3a index_name \u7684\u7d22\u5f15\u3002<\/p><p>\u2462DROP FOREIGN KEY fk_symbol\uff1a\u8868\u793a\u5220\u9664\u5916\u952e\u3002<\/p><\/blockquote>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a\u5982\u679c\u5220\u9664\u7684\u5217\u662f\u7d22\u5f15\u7684\u7ec4\u6210\u90e8\u5206\uff0c\u90a3\u4e48\u5728\u5220\u9664\u8be5\u5217\u65f6\uff0c\u4e5f\u4f1a\u5c06\u8be5\u5217\u4ece\u7d22\u5f15\u4e2d\u5220\u9664\uff1b\u5982\u679c\u7ec4\u6210\u7d22\u5f15\u7684\u6240\u6709\u5217\u90fd\u88ab\u5220\u9664\uff0c\u90a3\u4e48\u6574\u4e2a\u7d22\u5f15\u5c06\u88ab\u5220\u9664\u3002<\/strong><\/p>\n\n\n\n<p>\u4f7f\u7528DROP INDEX\u8bed\u53e5\u5220\u9664\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>drop index in_employee on employee;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205133429322.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205133429322.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>show create table employee;<\/p>\n\n\n\n<p>\u6ce8\uff1a\u4e5f\u53ef\u4ee5\u7528 ALTER TABLE \u6765\u5220\u9664\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table employee drop index in_phone ;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205133442691.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205133442691.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>5.9\u7814\u7a76\u4e0e\u601d\u8003<\/h3>\n\n\n\n<h4>5.9.1\u4f7f\u7528CREATE INDEX\u8bed\u53e5\u80fd\u521b\u5efa\u4e3b\u952e\u5417\uff1f\u6dfb\u52a0\u4e3b\u952e\u4e0e\u6dfb\u52a0\u666e\u901a\u7d22\u5f15\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n\n\n\n<p>\u200b \u4e0d\u80fd\u901a\u8fc7\u4f7f\u7528create index\u8bed\u53e5\u6765\u521b\u5efa\u4e3b\u952e\u3002\u6dfb\u52a0\u4e3b\u952e\u4f1a\u81ea\u52a8\u521b\u5efa\u4e3b\u952e\u7d22\u5f15\uff0c\u666e\u901a\u7d22\u5f15\u9700\u8981\u81ea\u5df1\u624b\u52a8\u521b\u5efa\u3002<\/p>\n\n\n\n<h4>5.9.2\u5982\u679c\u5220\u9664\u57fa\u672c\u8868\u7684\u4e00\u4e2a\u5217\u6216\u8005\u591a\u4e2a\u5217\uff0c\u8be5\u5217\u4e0a\u7684\u7d22\u5f15\u4f1a\u53d7\u600e\u6837\u7684\u5f71\u54cd\uff1f<\/h4>\n\n\n\n<p>\u200b \u7d22\u5f15\u662f\u7531\u6570\u636e\u5e93\u8fdb\u884c\u7ef4\u62a4\u7684\uff0c\u5f53\u6211\u4eec\u5bf9\u5b58\u5728\u7684\u7d22\u5f15\u8fdb\u884c\u589e\u5220\u67e5\u6539\u7684\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u6d89\u53ca\u5230\u7d22\u5f15\u5217\uff0c\u6570\u636e\u5e93\u90fd\u4f1a\u5bf9\u7d22\u5f15\u8868\u8fdb\u884c\u66f4\u65b0\u3002\u56e0\u6b64\u53ef\u4ee5\u77e5\u9053\uff0c\u5f53\u8868\u4e2d\u67d0\u4e2a\u5217\u88ab\u5220\u9664\u540e\uff0c\u5728\u8be5\u5217\u4e0a\u7684\u7d22\u5f15\u4e5f\u4f1a\u88ab\u5220\u9664\u6389\u3002<\/p>\n\n\n\n<p>5.10\u8be6\u7ec6\u7684\u5b9e\u9a8c\u8d44\u6599\u4ee5\u53ca\u6307\u5bfcPPT\u8bf7\u8bbf\u95ee\u7b14\u8005GitHub\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/LJF2402901363\/database_experiment.git\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/github.com\/LJF2402901363\/database_experiment.git<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>5.\u7d22\u5f15\u5b9e\u9a8c 5.1\u7d22\u5f15\u7684\u5b9a\u4e49 \u200b \u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u5e93\u7ed3\u6784\uff0c\u7531\u6570\u636e\u8868\u4e2d\u7684\u4e00\u5217\u6216\u591a\u5217\u7ec4\u5408\u800c\u6210\uff0c\u53ef\u4ee5\u7528\u6765\u5feb\u901f\u67e5\u8be2\u6570\u636e\u8868\u4e2d\u6709\u67d0\u4e00\u7279\u5b9a &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[120],"tags":[95,142,141,140],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/383"}],"collection":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/comments?post=383"}],"version-history":[{"count":2,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/383\/revisions"}],"predecessor-version":[{"id":392,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/383\/revisions\/392"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=383"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=383"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}