Question

我遇到了一个场景，我对如何让它发挥作用感到困惑。

我如何从SUM结果中COUNT两个不同的组？

Select Count(VisitID), Types 
From Customers
Group by Types;

结果如下：

Type VisitID
A    10
B    20
C    1

我希望结果如下：

Type VisitID
A+C  11

感谢。

Answer 1

例如CTE：

WITH CustomerCounts ([Count], [Types])
AS
(
    Select Count(VisitID), [Types] 
    from Customers
    Group by [Types]
)
Select SUM([Count]) 
From CustomerCounts
Where [Types] in ('A', 'C')

Answer 2

试试这个

仅选择您想要的类型，然后使用pivot将行转换为列，然后像这样汇总列SELECT pv.[a] + pv.[c] from (..........)

总计计数访问 - Sql

2 个答案: