Question

如何使用“IN”两个子选项？

我现在有：

select colA, colB from table1 where colC in
                 (select T1 from tableT1 where colx = 'Y')
                 and ColD = 'Y';

我也需要 colC 进入第二个子选择：

select colA, colB from table1 where colC in
                 ((select T1 from tableT1 where colx = 'Y')
                  or
                 (select T2 from tableT2 where colx = 'Y'))
                 and ColD = 'Y';

可以这样做吗？或者也许是一些工会？

Answer 1

您可以使用union：

where colC in
(
    select T1 from tableT1 where colx = 'Y'
    union
    select T2 from tableT2 where colx = 'Y'
)
and ColD = 'Y'

Answer 2

我也需要colC进入第二个子选择：

如果你需要它在两个表中，那么你可以这样做：

select colA, colB
from   table1
where  colC in ( select T1 from tableT1 where colx = 'Y' )
AND    colC in ( select T2 from tableT2 where colx = 'Y' )
AND    ColD = 'Y';

如果您需要它在一个或另一个（或两个）表中，那么您可以这样做：

select colA, colB
from   table1
where  (  colC in ( select T1 from tableT1 where colx = 'Y' )
       OR colC in ( select T2 from tableT2 where colx = 'Y' )
       )
AND    ColD = 'Y';

Answer 3

尝试此查询

select colA, colB from 
                 ((select T1 as T, ColA,colB from tableT1 where colx = 'Y')
                  Union
                 (select  T2 as T, ColA,colB from tableT2 where colx = 'Y'))  as table1 where table1.T = ColC
                 and ColD = 'Y';

我认为Colc是一个值而不是列，因为你不能在你的问题中提到的值搜索值的地方使用列名

两个subselect进入“IN”（oracle，sql）

3 个答案: