B2(+) = 3

Question

Hi all,
I have samll doubt in the following query. here is the query,
select a1,a2,b1,b2 from a,b where a1=b1(+) and b2(+) = 3
in the above query what does "b2(+) = 3 " what does it mean. I never heard about that. Please explain me.
Thanks in advance.
Regards,
Uvaraja

Answer 1

it provides, if there is a row comming from B table it must have 3 in b2 column but also the other rows which is comming from A table but not in B would come.
you can test it too.
create table a (id number);
create table b (id number, r number);
insert into a values (1);
insert into a values (2);
insert into a values (3);
insert into b values (1,2);
insert into b values (3,2);
insert into b values (3,3);
commit;
select * from a,b where a.id=b.id(+) and b.r(+) = 3;
3     3     3
2     null     null
1     null     null
select * from a,b where a.id=b.id(+) and b.r = 3 ;
3     3     3Edited by: Mustafa Kalaycı on Jul 31, 2012 3:09 AM