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