\u7d22\u5f15<\/p>\n
\u5176\u5b9e\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u662f\u6309\u9875\u5b58\u653e\u7684
\n\u5176\u5b9e\u7d22\u5f15\u4e5f\u662f\u6309\u9875\u5b58\u653e\u7684
\n\u6240\u4ee5\u672c\u8d28\u4e0a\u7d22\u5f15\u4e5f\u5360\u786c\u76d8\u7a7a\u95f4\uff08\u4ee5\u6700\u5c0f\u7684\u6d88\u8017\uff0c\u6362\u53d6\u6700\u5927\u7684\u5229\u76ca\uff09<\/p>\n
\u7d22\u5f15\u662f\u4e00\u79cd\u6709\u6548\u7ec4\u5408\u6570\u636e\u7684\u65b9\u5f0f\uff01\u4e3a\u5feb\u901f\u67e5\u627e\u5230\u6307\u5b9a\u8bb0\u5f55\u505a\u94fa\u57ab<\/p>\n
\u76ee\u7684\u5c31\u662f\u5feb\u901f\u6216\u8005\u67d0\u4e2a\u8bb0\u5f55\uff01\u63d0\u9ad8\u4e86\u6570\u636e\u5e93\u7684\u68c0\u7d22\u901f\u5ea6\uff01
\n\u4f5c\u7528\uff1a
\n\u5927\u5927\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u68c0\u7d22\u901f\u5ea6
\n\u6539\u5584\u6570\u636e\u5e93\u6027\u80fd<\/p>\n
MySQL\u7d22\u5f15\u5b58\u50a8\u7c7b\u578b\u5206\u7c7b
\n01.B-\u6811\u7d22\u5f15\uff1aInnoDB\uff0cMyISAM\u5747\u652f\u6301
\n02.\u54c8\u5e0c\u7d22\u5f15<\/p>\n
\u5176\u5b9e\u7d22\u5f15\u662f\u628a\u53cc\u5203\u5251\uff08\u5229\u5f0a\u5171\u5b58\uff09\uff0c\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\uff0c\u53cd\u800c\u4f1a\u964d\u4f4e\u7d22\u5f15\u6027\u80fd<\/p>\n
\u4e3b\u952e\uff1a\u52a0\u5feb\u68c0\u7d22\u6570\u636e\/\u552f\u4e00\u6807\u8bc6<\/p>\n
\u5e38\u7528\u7d22\u5f15\u7c7b\u578b\uff1a
\n01.\u666e\u901a\u7d22\u5f15\uff1a\u5141\u8bb8\u5728\u5b9a\u4e49\u4e3a\u7d22\u5f15\u7684\u5217\u4e2d \u51fa\u73b0 \u91cd\u590d\u503c\u548c\u7a7a\u503c\uff01
\n02.\u552f\u4e00\u7d22\u5f15\uff1a\u7d22\u5f15\u5217\u4e0d\u5141\u8bb8\u51fa\u73b0\u91cd\u590d\u503c\uff0c\u4f46\u662f\u53ef\u4ee5\u51fa\u73b0\u4e00\u4e2a\u7a7a\u503c\uff01
\n03.\u4e3b\u952e\u7d22\u5f15\uff1a\u521b\u5efa\u4e3b\u952e\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u4f1a\u9ed8\u8ba4\u521b\u5efa\u4e00\u4e2a\u4e3b\u952e\u7d22\u5f15\uff01\u552f\u4e00\uff01\u4e0d\u80fd\u4e3a\u7a7a\uff01
\n04.\u590d\u5408\u7d22\u5f15\uff1a\u5c06\u6211\u4eec\u7684\u591a\u4e2a\u5217\u7ec4\u5408\u8d77\u6765\uff01\uff08name,sid\uff09\u59d3\u540d\u548c\u8eab\u4efd\u8bc1\u53f7\uff01
\n05.\u5168\u6587\u7d22\u5f15\uff1a\u5141\u8bb8\u503c\u7684\u5168\u6587\u67e5\u8be2\uff01\u5141\u8bb8\u7a7a\u503c\u548c\u91cd\u590d\u503c\uff01\u9002\u5408\u5728\u4e00\u4e2a\u5185\u5bb9\u6bd4\u8f83\u591a\u7684\u5217\uff01text\uff01
\n06.\u7a7a\u95f4\u7d22\u5f15\uff1a\u5bf9\u7a7a\u95f4\u6570\u636e\u7c7b\u578b\u7684\u5217\u5efa\u7acb\u7684\u7d22\u5f15<\/p>\n
\u25a0\u6309\u7167\u4e0b\u5217\u6807\u51c6\u9009\u62e9\u5efa\u7acb\u7d22\u5f15\u7684\u5217
\n\u9891\u7e41\u641c\u7d22\u7684\u5217
\n\u7ecf\u5e38\u7528\u4f5c\u67e5\u8be2\u9009\u62e9\u7684\u5217
\n\u7ecf\u5e38\u6392\u5e8f\u3001\u5206\u7ec4\u7684\u5217
\n,\u7ecf\u5e38\u7528\u4f5c\u8fde\u63a5\u7684\u5217(\u4e3b\u952e\/\u5916\u952e)
\n\u25a0\u8bf7\u4e0d\u8981\u4f7f\u7528\u4e0b\u9762\u7684\u5217\u521b\u5efa\u7d22\u5f15
\n\u4ec5\u5305\u542b\u51e0\u4e2a\u4e0d\u540c\u503c\u7684\u5217
\n\u8868\u4e2d\u4ec5\u5305\u542b\u51e0\u884c<\/p>\n
Eg:<\/p>\n
—\u00a0 \u67e5\u8be2\u6307\u5b9a\u8868\u7684\u7d22\u5f15
\nSHOW INDEX FROM student;
\nTABLE:\u7d22\u5f15\u6240\u5728\u7684\u8868
\nNon_unique:\u7d22\u5f15\u662f\u5426\u552f\u4e00\u00a0 0:\u552f\u4e00\u00a0 1\uff1a\u4e0d\u552f\u4e00
\nkey_name\uff1a\u7d22\u5f15\u540d\u79f0
\nseq_in_index:\u8be5\u5217\u5728\u7d22\u5f15\u4e2d\u7684\u4f4d\u7f6e
\ncolumn_name:\u5b9a\u4e49\u6240\u7528\u7684\u5217\u540d\u79f0
\nnull\uff1a\u8be5\u5217\u662f\u5426\u4e3a\u7a7a
\nindex_type:\u7d22\u5f15\u7c7b\u578b<\/p>\n
—\u00a0 \u7ed9\u59d3\u540d\u589e\u52a0 \u666e\u901a\u7d22\u5f15
\nCREATE\u00a0 INDEX index_studentName
\nON student(studentName);
\n— \u7ed9\u5b66\u751f\u59d3\u540d\u548c\u8eab\u4efd\u8bc1\u53f7 \u589e\u52a0 \u7ec4\u5408\u7d22\u5f15
\nCREATE INDEX index_name_sid
\nON student(studentName,identityCard)<\/p>\n
—\u00a0 \u5220\u9664\u7d22\u5f15
\nDROP INDEX index_name_sid ON\u00a0 student;
\nDROP\u00a0 INDEX index_studentName ON\u00a0 student;<\/p>\n
—\u00a0 \u521b\u5efa\u7d22\u5f15\u7684\u539f\u5219
\n01.\u7ecf\u5e38\u88ab\u67e5\u8be2\u7684\u5217
\n02.\u7ecf\u5e38\u7528\u4f5c\u9009\u62e9\u7684\u5217
\n03.\u7ecf\u5e38\u6392\u5e8f\uff0c\u5206\u7ec4\u7684\u5217
\n04.\u7ecf\u5e38\u7528\u4f5c\u8fde\u63a5\u7684\u5217\uff08\u4e3b\u952e\/\u5916\u952e\uff09<\/p>\n
\u4f7f\u7528\u7d22\u5f15\u65f6\u7684\u6ce8\u610f\u4e8b\u9879\uff1a
\n01.\u67e5\u8be2\u65f6\u51cf\u5c11\u4f7f\u7528*\u8fd4\u56de\u5168\u90e8\u7684\u5217\uff0c\u4e0d\u8981\u8fd4\u56de\u4e0d\u9700\u8981\u7684\u5217\uff01
\n02.\u7d22\u5f15\u5c3d\u91cf\u8981\u5c11\uff0c\u5728\u5b57\u8282\u6570\u5c0f\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff01
\n03.where\u5b57\u53e5\u4e2d\u6709\u591a\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u65f6\u5019\uff0c\u5305\u542b\u7d22\u5f15\u7684\u5217\u8981\u653e\u5728\u5176\u4ed6\u8868\u8fbe\u5f0f\u4e4b\u524d\uff01
\n04.\u5728order by\u7684\u5b57\u53e5\u4e2d\u907f\u514d\u4f7f\u7528\u8868\u8fbe\u5f0f\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7d22\u5f15 \u5176\u5b9e\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u662f\u6309\u9875\u5b58\u653e\u7684 \u5176\u5b9e\u7d22\u5f15\u4e5f\u662f\u6309\u9875\u5b58\u653e\u7684 \u6240\u4ee5\u672c\u8d28\u4e0a\u7d22\u5f15\u4e5f\u5360\u786c\u76d8\u7a7a\u95f4\uff08\u4ee5\u6700\u5c0f\u7684\u6d88\u8017\uff0c\u6362\u53d6\u6700 … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10],"tags":[],"class_list":["post-3218","post","type-post","status-publish","format-standard","hentry","category-shujuku"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=3218"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3218\/revisions"}],"predecessor-version":[{"id":3219,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3218\/revisions\/3219"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=3218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=3218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=3218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}