---------添加索引方法---------

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` )

查看表的索引：

show index from table_name（表名）

https://blog.csdn.net/superdangbo/article/details/79283752

--删除索引

if exists(select name from sysindexes where name = 'suoyin')

drop index temp.suoyin ---如果存在这个名字的索引，则删除这个索引

create nonclustered index suoyin_name on temp(Name)

--主键，加聚集索引

ALTER TABLE [dbo].[FcyOrder] ADD  CONSTRAINT [PK_FcuencyOrder] PRIMARY KEY CLUSTERED (

    [FreqOrderId] ASC

)

go

CREATE NONCLUSTERED INDEX [IX_Code] ON [dbo].[Fct_Product] ([ProductCode]) ON [PRIMARY]

GO

CREATE INDEX [IX_OrderId] ON [dbo].[FncyOrder]

([OrderId] ASC)

GO

CREATE INDEX [IDX_Disabled_ChanyCodeAndName] ON [dbo].[Fcommodity]

([Disabled] ASC)

INCLUDE ([ChadityCode], [ChaodityName])

GO

CREATE UNIQUE INDEX [IDX_SiteWarehouseAndSerialNumber] ON [dbo].[FcquestInfo]

([SerialNumber] ASC, [SiouseId] ASC)

WITH (IGNORE_DUP_KEY = ON)

GO

CREATE UNIQUE INDEX [IX_tockFove_FoveNo] ON [dbo].[TockFove]

([FveNo] ASC)

WITH (IGNORE_DUP_KEY = ON)

GO