如何获得SQL Server中不同行的数量？

Question

我的查询是这样的：

select distinct col1,col2,col3,col4 
from tab1; 

我怎样才能当我执行上面的语句会作为输出的行数？ ...或者如何将count()添加到上述语句中？

Answer 1

;with cte as (
    select distinct col1,col2,col3,col4 from tab1 
) 
select count(1) from cte 

Answer 2

@@ROWCOUNT返回你所需要的...

用法示例：

declare @resultCount AS INT 

select distinct col1,col2,col3,col4 
from tab1; 

SELECT @resultCount=@@ROWCOUNT 

PRINT @resultCount 

Answer 3

SELECT COUNT(DISTINCT col1,col2,col3,col4) FROM tabl