mysql基本操作

1.为已经存在的表添加联合索引:
mysql> alter table fy_houseinfo add index index_s_t_s_d_b (`SourceType`,`TradeType`,`status`,`District`,`Block`);

====================
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` )

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