两个SUM和两个GROUP BY

Question

我有一个像这样的选择查询，它可以得到正确的结果：

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

现在我希望通过这样的条件与另一个组进行第二次求和，这也得到了正确的结果：

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

但是我如何构建一个选择查询，这给了我两个总和？

Answer 1

你可以这样做：

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提供重复值...不知道它是否有用。