sql-server-2008 - 如何获取 SQL Server 中不同行的计数？

Question

我的查询看起来像：

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

当我执行上述语句时，如何获取将作为输出的行数？...或如何添加count()到上述声明？

Answer 1

@@ROWCOUNT返回您需要的...

示例用法：

declare @resultCount AS INT

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

SELECT @resultCount=@@ROWCOUNT

PRINT @resultCount

Answer 2

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

Answer 3

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