Correlated subquery help

Question

Hi I've the following tables and the requirement
create table test1 (id number,rk varchar2(11),rk_cd varchar2(11))
create table test2 (id number,rk1 varchar2(11),rk_cd1 varchar2(11))
insert into test1 values(1,'I+','LG')
insert into test1 values(2,'I-','SH')
insert into test2 values(1,'I+','LG')
insert into test2 values(1,'I+','LG')for a single id in TEST1 Table there could be multiple rows in TABLE2, so i need to get the matching records in both tables
I tried the folloiwng query to achieve the same
select * from test1
where (rk,rk_cd) = all (select NVL(rk1,'X'),NVL(rk_cd1,'X')
                  from test2
            where TEST1.ID=test2.id  The above query is returning me even the id=2 , where id=2 doesn't exist in TEST2
Could you hint me the changes i need to do in subquery.
Expected output
Only id=1 record Thank you

Answer 1

Hi,
Perhaps you meant to say ANY instead of ALL:
SELECT  *
FROM      test1
WHERE  (rk, rk_cd) = ANY (
                              SELECT  NVL (rk1,    'X')
                   ,         NVL (rk_cd1, 'X')
                           FROM    test2
                     WHERE   test1.id     = test2.id 
;Most people would use "IN" rather than "= ANY".
Do you really mean what you're saying with NVL? If that's important, then include some examples in the sample data and results where it matters. For example:
INSERT INTO  test1 (id, rk, rk_cd) VALUES  (3, 'I+', 'X');
INSERT INTO  test2 (id, rk1, rk_cd1) VALUES  (3, 'I+', NULL);Edited by: Frank Kulash on Jul 9, 2012 6:15 AM