mysql将两个或多个选择合并到一个表中

Question

我想将下面的查询合并到一个表中，但是'union'的结果是将它合并到一个列中。 我希望它创建不同的列，而不是像图中所示的那样。
我如何实现这一目标？

我有这样的查询：

(select count(*) as col_1
   from ref_A
   inner join ref_B
   on ref_A.id_A= ref_B.id_A
   inner join ref_C
   on ref_C.id_C= ref_B.id_C
   group by ref_C.id_C) 
union all

(select count(*) as col_2
   from ref_B
   inner join ref_C
   on ref_C.id_C= ref_B.id_C
   group by ref_C.id_C) 

_________________
| col_1 | col_2 |
|_______|_______|
|1      |$ 2,00 |
-----------------
|2      |$ 3,50 |
-----------------

Answer 1

试试这个，

(select count(*) as col_1, 'table 1' as ident
   from ref_A
   inner join ref_B
   on ref_A.id_A= ref_B.id_A
   inner join ref_C
   on ref_C.id_C= ref_B.id_C
   group by ref_C.id_C) 
union all

(select count(*) as col_1, 'table 2' as ident
   from ref_B
   inner join ref_C
   on ref_C.id_C= ref_B.id_C
   group by ref_C.id_C) 

这里的ident不会合并来自两个查询的数据，查询数据只有在找到相同的行时才会合并。