mysql添加索引

1.添加PRIMARY KEY（主键索引）

mysql>ALTER TABLE

table_name

ADD PRIMARY KEY (

column

)

2.添加UNIQUE(唯一索引)

mysql>ALTER TABLE

table_name

ADD UNIQUE (

column

)

3.添加INDEX(普通索引)

mysql>ALTER TABLE

table_name

ADD INDEX index_name (

column

)

4.添加FULLTEXT(全文索引)

mysql>ALTER TABLE

table_name

ADD FULLTEXT (

column

)

5.添加多列索引

mysql>ALTER TABLE

table_name

ADD INDEX index_name (

column1

,

column2

,

column3

)