Tricky SQL statement

Question

Hi,
I've got 3 columns X,Y & Z.
Each column can have the values 'A', 'B' or NULL.
If 2 out of 3 have an 'A' I want to get 'TEXT1', if 2 out of 3 have a 'B' I want to get 'TEXT2' in all other cases I want to 'TEXT3'.
I'm using 8.1.7.0.0 and only direct SQL is allowed (so no own functions or procedure's).
Can anybody help me please?

Answer 1

create table test(x varchar2(1), y varchar2(1), z varchar2(1));
delete from test ;
insert into test values('A', 'A', 'A');
insert into test values('A', 'A', 'B');
insert into test values('A', 'A', null);
insert into test values('A', 'B', 'A');
insert into test values('A', 'B', 'B');
insert into test values('A', 'B', null);
select
min(decode (zcount,2,decode(zcol,'A','TEXT1','B','TEXT2','TEXT3') ,'TEXT3'))
from
(select zcol, count(*) zcount, zrowid
from
(select x zcol , rowid zrowid from test
union all
select y zcol , rowid zrowid from test
union all
select z zcol , rowid zrowid from test
group by zcol, zrowid
) AAA
group by zrowid
TEXT3
TEXT1
TEXT1
TEXT1
TEXT2
TEXT3