MySQL查询效率优化 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` )
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