两个SUM和两个GROUP BY

Question

我有一个像这样的选择查询，它给出正确的结果：

SELECT SUM(value) AS "sum1" FROM table GROUP BY id1, id2

现在，我希望按这样的条件与另一个组进行第二次求和，也可以得出正确的结果：

SELECT SUM(value) AS "sum2" FROM table GROUP BY id1

但是，如何建立一个选择查询，让我两全其美呢？

Answer 1

您可以执行以下操作：

SELECT t1.sum1, t2.sum2
FROM 
(select sum(value) as sum1 from table group by id1, id2) as t1
join 
(select sum(value) as sum2 from table group by id1) as t2

但是由于您有不同的组，结果将为sum1提供重复的值...不知道这是否有用。