如何计算SQL Server中的不同列

Question

请帮我 ..

我运行这个查询：

select 
    distinct barang, COUNT(*) as jumlah, CAST(COUNT(*) as float) / 6 
from  
    tbltes  
group by 
    barang 
Having 
    CAST(COUNT(*) as float) / 6 >0.2

现在..我想计算上面查询显示的所有行..

我试过这个查询..

 select 
     count (distinct barang)    
 from 
     tbltes 
 group by 
     barang  
 having 
     CAST(COUNT(*) as float) /6 > 0.2

但不像我的期望......

所以我需要你的帮助大师......

Answer 1

只需将现有查询用作子查询即可。 顺便说一句，如果你有一个group by子句，则不需要select distinct 。

select count(distinct sq.barang)
from
(
select  barang as barang
        ,COUNT(*) as jumlah
from    tbltes  
group by 
        barang 
) sq
where cast(sq.jumlah as float)/6 > 0.2

这是SQL小提琴

Answer 2

您是否希望用于创建结果的数据库表tbltes中的行数？ 或结果中的行数？

如果后者只是将Select Count(*) From放在整个事物的周围......

 Select Count(*)
 From  (select distinct barang,COUNT(*) as jumlah,
            CAST(COUNT(*) as float) / 6 
        from  tbltes  
        group by barang 
        Having CAST(COUNT(*) as float) / 6 >0.2 ) z