mysql语句删除唯一索引

查看表索引

  show index    from    topic_watch_read_record;

删除表索引

alter table        t_topic_watch_read_record         drop index           uk_user;

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` )