MYSQL如何添加索引
1.添加PRIMARY KEY(主键索引)ALTER TABLE `table_name` ADD PRIMARY KEY ( `column` )
2.添加UNIQUE(唯一索引) ALTER TABLE `table_name` ADD UNIQUE ( `column`)
3.添加INDEX(普通索引) ALTER TABLE `table_name` ADD INDEX index_name ( `column` )
4.添加FULLTEXT(全文索引) ALTER TABLE `table_name` ADD FULLTEXT ( `column`)
5.添加多列索引 ALTER TABLE `table_name` ADD INDEX index_name ( `column1`, `column2`, `column3` )
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