如何在SQL中按同一列过滤两次？

Question

假设我有一列要求和的日期、类别和值。我希望按类别分组并对值求和，使其满足特定日期集的特定条件，以及另一组日期的另一个条件。

类似于：

 SELECT categories, SUM(values) 
 FROM table 
 group by categories
 having SUM(values) = 0 WHEN dates between w AND x 
 AND having SUM(values) > 10000 WHEN dates between y and z

谢谢！

Answer 1

我想你想要条件聚合：

 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 只有符合条件的值进入 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

如何在SQL中按同一列过滤两次？

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