两个subselect into "IN" (oracle, sql)

Question

如何使用 into "IN" 两个 subselect?

我现在有：

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

我还需要 colC 将进入第二个子选择：

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

试试这个查询

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';

我假设 Colc 是一个值而不是一个列，因为您不能像您在问题中提到的那样使用列名来搜索值

Answer 3

I need too also that colC will be into second subselect:

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';

如果你需要它在一个或另一个（或两个）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' )
       OR colC in ( select T2 from tableT2 where colx = 'Y' )
       )
AND    ColD = 'Y';

两个subselect into "IN" (oracle, sql)

Two subselect into "IN" (oracle, sql)

sql

oracle12c

sql-in