SQL 百分比

问：

某个表数据如下:

A

A

A

B

B

B

B

C

C

D

有没有办法用sql写出一个语句,查询结果如下:

A 30%

B 40%

C 20%

D 10%

答：

--創建測試環境

Create Table test1

(

ftest Varchar(20))

Insert test1 Select 'A'

Union All Select 'A'

Union All Select 'A'

Union All Select 'B'

Union All Select 'B'

Union All Select 'B'

Union All Select 'B'

Union All Select 'C'

Union All Select 'C'

Union All Select 'D'

--查询

select ftest, 百分比=cast(cast(count(*)*100./(select count(*) from test1) as decimal(10,0)) as varchar)+'%'

from test1

group by ftest

go

--删除测试

drop table test1