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
)