Question

我已经坚持了很久。这可能是显而易见的事情，但说实话，我没有那么多的SQL知识。我得到了以下两个表：

Date1       Cost1
-------------------
01-01-14    50,65
02-01-14    12,12

和

Date2       Cost2
-------------------
01-01-14    123,12
02-01-14    14,15

我需要关注输出：

Number of month    Total amount of table 1 and 2 for that specific month
-------------------------------------------------------------------------
1                  2425252,52
2                  53252,89

我得到的查询适用于单个表，我可以在我的实际代码中对它们进行排序，但我只知道它可以通过查询但我根本无法找到方法。我一直在关注内部和外部联接，但由于我使用了两个分组语句，因此我得到的结果是每个月的数字乘以12并且值不正确。

提前非常感谢你。

Answer 1

您可以将结果合并在一起，然后对这些结果求和。请记住，您根据OP过了几年。如果这不是意图，那么我还提供了按年和月分组的替代方案。

按月分组：

SELECT c1.monthNum
    , sum(c1.cost) as cost
FROM 
(
    SELECT to_char(t1.date1, 'MM') as monthNum, SUM(t1.cost1)  as cost
    FROM table1 t1
    WHERE ..your table1 where clause here...
    GROUP BY to_char(t1.date1, 'MM') 

    UNION ALL

    SELECT to_char(t2.date1, 'MM') as monthNum, SUM(t2.cost1)  as cost
    FROM table1 t2
    WHERE ..your table2 where clause here...    
    GROUP BY to_char(t2.date1, 'MM')
) c1
GROUP BY c1.monthNum

或按年份分组：

SELECT c1.yearNum
    , c1.monthNum
    , sum(c1.cost) as cost
FROM 
(
    SELECT to_char(t1.date1, 'YYYY') AS yearNum, to_char(t1.date1, 'MM') as monthNum, SUM(t1.cost1)  as cost
    FROM table1 t1
    WHERE ..your table1 where clause here...
    GROUP BY to_char(t1.date1, 'YYYY'), to_char(t1.date1, 'MM') 

    UNION ALL

    SELECT to_char(t2.date1, 'YYYY') AS yearNum, to_char(t2.date1, 'MM') as monthNum, SUM(t2.cost1)  as cost
    FROM table1 t2
    WHERE ..your table2 where clause here...    
    GROUP BY to_char(t2.date1, 'YYYY'), to_char(t2.date1, 'MM')
) c1
GROUP BY c1.yearNum, c1.monthNum

Oracle将两个月的总和与不同的表相结合

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