Using CASE to return a set of columns

Question

Good day all,
Many times I have used the CASE construct to return a value based on a set of conditions but now I have a need to return a set of columns based on a set of condition.
Look at this
A
=====
id
name
account
zip_code
status
B
=====
id
name
account
zip_code
C
=======
id
name
account
zip_code
D
======
id
name
account
zip_code
I want a query that would return
id - of A
name, - of A
beneficiary, - name column of either, A, B, C or D depending on the value of A's status (A, B, C, D)
account, - account column of either, A, B, C or D depending on the value of A's status (A, B, C, D)
zip_code - zip_code column of either, A, B, C or D depending on the value of A's status (A, B, C, D)
Can anyone help with construct that could achieve this with queries only. I don't feel like this warrants PLSQL.
regards

Answer 1

Hi,
Is this what youa re looking for?
As Frank has said not sure what is the relationship between your tables and what Output you expect.
Sample Data used.Avoid using reserved words for column like ID and NAME
create table a (id1 varchar2(10),name1 varchar2(10),account1 varchar2(10),zip_code varchar2(10),status varchar2(10))
create table b (id1 varchar2(10),name1 varchar2(10),account1 varchar2(10),zip_code varchar2(10))
create table c (id1 varchar2(10),name1 varchar2(10),account1 varchar2(10),zip_code varchar2(10))
create table d (id1 varchar2(50),name1 varchar2(50),account1 varchar2(50),zip_code varchar2(50))
insert into A values (0, 'michael', '000000', '213401', 'A');
insert into A values (1, 'johnson', '63423', '093401', 'B');
insert into A values (2, 'fred', '23221', '203901', 'D');
insert into B values (1, 'brother', '1129812', '093083');
insert into B values (2, 'stuggard', '0093732', '087366');
insert into B values (3, 'jekins', '9009387', '329838');
insert into C values (1, 'mary', '009300', '093083');
insert into C values (2, 'lori', '112212', '654032');
insert into C values (3, 'helen', '909083', '938292');
insert into D values (1, 'mother & father', '093291', '329232');
insert into D values (2, 'Uncles & Aunties', '098762', '742326');
insert into D values (3, 'Grannies', '237643', '864433');
Query
select 
case when a.status='A' then
a.id1
when a.status='B' then
b.id1
when a.status='C' then
c.id1
when a.status='D' then
d.id1
end ID1,
case when a.status='A' then
a.name1
when a.status='B' then
b.name1
when a.status='C' then
c.name1
when a.status='D' then
d.name1
end ID1
,case when a.status='A' then
a.account1
when a.status='B' then
b.account1
when a.status='C' then
c.account1
when a.status='D' then
d.account1
end account1,
a.status status,
case when a.status='A' then
a.zip_code
when a.status='B' then
b.zip_code
when a.status='C' then
c.zip_code
when a.status='D' then
d.zip_code
end zip_code
from a ,b,c,d
where a.id1=b.id1 and b.id1=c.id1 and c.id1=d.id1Cheers!!!
Bhushan