如何在SQL中按同一列过滤两次？

Question

假设我有一列日期，类别和值要求和。我希望按类别进行分组并对值进行求和，使其满足特定日期的某些条件，以及另一组日期的另一个条件。

类似的东西：

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                 HorizontalAlignment = "Left" Height = "30" Width = "100"> Pause </ Button>

谢谢！

Answer 1

我认为你想要条件聚合：

 select categories, sum(values) 
 from table 
 group by categories
 having sum(case when dates between w and x then values else 0 end) = 0 and
        sum(case when dates between y and z then values else 0 end) > 10000 ; 

Answer 2

您可以执行以下操作（SUM仅将尊重条件的值转换为IIF子句：

SELECT categories, SUM(values) 
FROM table 
GROUP BY categories
HAVING SUM(IIF(dates BETWEEN w AND x, values, 0)) = 0 
AND SUM(IIF(dates BETWEEN y AND z, values, 0)) > 10000