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 )