{"id":1341,"date":"2022-07-22T10:11:36","date_gmt":"2022-07-22T02:11:36","guid":{"rendered":"https:\/\/sanlangcode.com\/?p=1341"},"modified":"2022-07-22T10:11:36","modified_gmt":"2022-07-22T02:11:36","slug":"mysql%e7%b4%a2%e5%bc%95%e7%b1%bb%e5%9e%8b%e5%92%8c%e5%88%9b%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/sanlangcode.com\/index.php\/2022\/07\/22\/mysql%e7%b4%a2%e5%bc%95%e7%b1%bb%e5%9e%8b%e5%92%8c%e5%88%9b%e5%bb%ba\/","title":{"rendered":"MySql\u7d22\u5f15\u7c7b\u578b\u548c\u521b\u5efa"},"content":{"rendered":"\n

MySQL\u76ee\u524d\u4e3b\u8981\u6709\u7684\u7d22\u5f15\u7c7b\u578b\u4e3a\uff1a\u666e\u901a\u7d22\u5f15\u3001\u552f\u4e00\u7d22\u5f15<\/a>\u3001\u4e3b\u952e\u7d22\u5f15\u3001\u7ec4\u5408\u7d22\u5f15\u3001\u5168\u6587\u7d22\u5f15\u3002<\/p>\n\n\n\n

\u901a\u8fc7\u7ed9\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u7684\u8bfb\u53d6\u901f\u5ea6\uff0c\u63d0\u9ad8\u9879\u76ee\u7684\u5e76\u53d1<\/a>\u80fd\u529b\u548c\u6297\u538b\u80fd\u529b\u3002\u7d22\u5f15\u4f18\u5316\u65f6mysql\u4e2d\u7684\u4e00\u79cd\u4f18\u5316\u65b9\u5f0f\u3002\u7d22\u5f15\u7684\u4f5c\u7528\u76f8\u5f53\u4e8e\u56fe\u4e66\u7684\u76ee\u5f55\uff0c\u53ef\u4ee5\u6839\u636e\u76ee\u5f55\u4e2d\u7684\u9875\u7801\u5feb\u901f\u627e\u5230\u6240\u9700\u7684\u5185\u5bb9\u3002

\u4e0b\u9762\u6211\u4eec\u6765\u770b\u770bMySQL\u76ee\u524d\u4e3b\u8981\u6709\u7684\u7d22\u5f15\u7c7b\u578b\uff1a

1\u3001\u666e\u901a\u7d22\u5f15

\u666e\u901a\u7d22\u5f15\u662f\u6700\u57fa\u672c\u7684\u7d22\u5f15\uff0c\u5b83\u6ca1\u6709\u4efb\u4f55\u9650\u5236\uff0c\u503c\u53ef\u4ee5\u4e3a\u7a7a\uff1b\u4ec5\u52a0\u901f\u67e5\u8be2\u3002\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u6765\u521b\u5efa\u6216\u5220\u9664\uff1a

1\uff09\u3001\u76f4\u63a5\u521b\u5efa\u7d22\u5f15<\/p>\n\n\n\n

CREATE INDEX index_name ON table(column(length))<\/pre>\n\n\n\n
2\uff09\u3001\u4fee\u6539\u8868\u7ed3\u6784\u7684\u65b9\u5f0f\u6dfb\u52a0\u7d22\u5f15<\/p>\n\n\n\n
ALTER TABLE table_name ADD INDEX index_name ON (column(length))<\/pre>\n\n\n\n
3\uff09\u3001\u5220\u9664\u7d22\u5f15<\/p>\n\n\n\n
DROP INDEX index_name ON table<\/pre>\n\n\n\n
2\u3001\u552f\u4e00\u7d22\u5f15

\u552f\u4e00\u7d22\u5f15\u4e0e\u666e\u901a\u7d22\u5f15\u7c7b\u4f3c\uff0c\u4e0d\u540c\u7684\u5c31\u662f\uff1a\u7d22\u5f15\u5217\u7684\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4f46\u5141\u8bb8\u6709\u7a7a\u503c\u3002\u5982\u679c\u662f\u7ec4\u5408\u7d22\u5f15\uff0c\u5219\u5217\u503c\u7684\u7ec4\u5408\u5fc5\u987b\u552f\u4e00\u3002\u7b80\u5355\u6765\u8bf4\uff1a\u552f\u4e00\u7d22\u5f15\u662f\u52a0\u901f\u67e5\u8be2 + \u5217\u503c\u552f\u4e00\uff08\u53ef\u4ee5\u6709null\uff09\u3002\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u6765\u521b\u5efa\uff1a

1\uff09\u3001\u521b\u5efa\u552f\u4e00\u7d22\u5f15<\/p>\n\n\n\n
CREATE UNIQUE INDEX indexName ON table(column(length))<\/pre>\n\n\n\n
2\uff09\u3001\u4fee\u6539\u8868\u7ed3\u6784<\/p>\n\n\n\n
ALTER TABLE table_name ADD UNIQUE indexName ON (column(length))<\/pre>\n\n\n\n
3\u3001\u4e3b\u952e\u7d22\u5f15

\u4e3b\u952e\u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u552f\u4e00\u7d22\u5f15\uff0c\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u4e0d\u5141\u8bb8\u6709\u7a7a\u503c\u3002\u7b80\u5355\u6765\u8bf4\uff1a\u4e3b\u952e\u7d22\u5f15\u662f\u52a0\u901f\u67e5\u8be2 + \u5217\u503c\u552f\u4e00\uff08\u4e0d\u53ef\u4ee5\u6709null\uff09+ \u8868\u4e2d\u53ea\u6709\u4e00\u4e2a\u3002

\u4e00\u822c\u662f\u5728\u5efa\u8868\u7684\u65f6\u5019\u540c\u65f6\u521b\u5efa\u4e3b\u952e\u7d22\u5f15\uff1a<\/p>\n\n\n\n
CREATE TABLE mytable( ID INT NOT NULL, username VARCHAR(16) NOT NULL, PRIMARY KEY(ID) );<\/pre>\n\n\n\n
\u5f53\u7136\u4e5f\u53ef\u4ee5\u7528 ALTER \u547d\u4ee4\u3002\u8bb0\u4f4f\uff1a\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002

4\u3001\u7ec4\u5408\u7d22\u5f15

\u7ec4\u5408\u7d22\u5f15\u6307\u5728\u591a\u4e2a\u5b57\u6bb5\u4e0a\u521b\u5efa\u7684\u7d22\u5f15\uff0c\u53ea\u6709\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u521b\u5efa\u7d22\u5f15\u65f6\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7d22\u5f15\u624d\u4f1a\u88ab\u4f7f\u7528\u3002\u4f7f\u7528\u7ec4\u5408\u7d22\u5f15\u65f6\u9075\u5faa\u6700\u5de6\u524d\u7f00\u96c6\u5408\u3002

\u53ef\u4ee5\u8bf4\uff1a\u7ec4\u5408\u7d22\u5f15\u662f\u591a\u5217\u503c\u7ec4\u6210\u7684\u4e00\u4e2a\u7d22\u5f15\uff0c\u4e13\u95e8\u7528\u4e8e\u7ec4\u5408\u641c\u7d22\uff0c\u5176\u6548\u7387\u5927\u4e8e\u7d22\u5f15\u5408\u5e76\u3002<\/p>\n\n\n\n
ALTER TABLE `table` ADD INDEX name_city_age (name,city,age);<\/pre>\n\n\n\n
5\u3001\u5168\u6587\u7d22\u5f15

\u5168\u6587\u7d22\u5f15\u4e3b\u8981\u7528\u6765\u67e5\u627e\u6587\u672c\u4e2d\u7684\u5173\u952e\u5b57\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4e0e\u7d22\u5f15\u4e2d\u7684\u503c\u76f8\u6bd4\u8f83\u3002fulltext\u7d22\u5f15\u8ddf\u5176\u5b83\u7d22\u5f15\u5927\u4e0d\u76f8\u540c\uff0c\u5b83\u66f4\u50cf\u662f\u4e00\u4e2a\u641c\u7d22\u5f15\u64ce\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u7684where\u8bed\u53e5\u7684\u53c2\u6570\u5339\u914d\u3002fulltext\u7d22\u5f15\u914d\u5408match against\u64cd\u4f5c\u4f7f\u7528\uff0c\u800c\u4e0d\u662f\u4e00\u822c\u7684where\u8bed\u53e5\u52a0like\u3002\u5b83\u53ef\u4ee5\u5728create table\uff0calter table \uff0ccreate index\u4f7f\u7528\uff0c\u4e0d\u8fc7\u76ee\u524d\u53ea\u6709char\u3001varchar\uff0ctext \u5217\u4e0a\u53ef\u4ee5\u521b\u5efa\u5168\u6587\u7d22\u5f15\u3002\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff0c\u5728\u6570\u636e\u91cf\u8f83\u5927\u65f6\u5019\uff0c\u73b0\u5c06\u6570\u636e\u653e\u5165\u4e00\u4e2a\u6ca1\u6709\u5168\u5c40\u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u7136\u540e\u518d\u7528CREATE index\u521b\u5efafulltext\u7d22\u5f15\uff0c\u8981\u6bd4\u5148\u4e3a\u4e00\u5f20\u8868\u5efa\u7acbfulltext\u7136\u540e\u518d\u5c06\u6570\u636e\u5199\u5165\u7684\u901f\u5ea6\u5feb\u5f88\u591a\u3002

1\uff09\u3001\u521b\u5efa\u8868\u7684\u9002\u5408\u6dfb\u52a0\u5168\u6587\u7d22\u5f15<\/p>\n\n\n\n
CREATE TABLE `table` (\n\n    `id` int(11) NOT NULL AUTO_INCREMENT ,\n\n    `title` char(255) CHARACTER NOT NULL ,\n\n    `content` text CHARACTER NULL ,\n\n    `time` int(10) NULL DEFAULT NULL ,\n\n    PRIMARY KEY (`id`),\n\n    FULLTEXT (content)\n\n);<\/pre>\n\n\n\n
2\uff09\u3001\u4fee\u6539\u8868\u7ed3\u6784\u6dfb\u52a0\u5168\u6587\u7d22\u5f15<\/p>\n\n\n\n
ALTER TABLE article ADD FULLTEXT index_content(content)<\/pre>\n\n\n\n
3\uff09\u3001\u76f4\u63a5\u521b\u5efa\u7d22\u5f15<\/p>\n\n\n\n
CREATE FULLTEXT INDEX index_content ON article(content)<\/pre>\n","protected":false},"excerpt":{"rendered":"
MySQL\u76ee\u524d\u4e3b\u8981\u6709\u7684\u7d22\u5f15\u7c7b\u578b\u4e3a...<\/p>\n","protected":false},"author":1,"featured_media":1342,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-4"],"_links":{"self":[{"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/posts\/1341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/comments?post=1341"}],"version-history":[{"count":0,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/posts\/1341\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/"}],"wp:attachment":[{"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/media?parent=1341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/categories?post=1341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanlangcode.com\/index.php\/wp-json\/wp\/v2\/tags?post=1341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}