Need SQL Query ---Urgent

Question

Hi Gurus,
Select * from xxa_test1
invoice_type || LOC_CODE|| seq_no
=========================
DOMESTIC     A     1
DOMESTIC     B     2
DOMESTIC     C     3
Select * from xxa_test2
cust_no || cust_name || loc_code
=======================
1001 Test B
1001 Test C
The Requirement is i want sql query to retrive only one record based on seq no if suppose 2 records retrive in that
B is having seqno 2 and c having seq no 3
that sql query should return only one record which is having min seq no. for example in that B, C only B record should return.
If multiple values returned then the program must check based on the seq no it should take min seq no.
i have written this query
Select *
from xxa_test2 t2
where t2.loc_code in (select t1.loc_code
from xxa_test1 t1
order by Seq_no
where above query is correct or not , i am getting problem with this query.
Please let me know its very urgent
Thanks
Manju
Edited by: venu on Jul 26, 2011 12:50 AM

Answer 1

Something like:
SELECT cust_no, cust_name, loc_code
FROM
(with xxa_test1
as (SELECT 'DOMESTIC' invoice_type, 'A' loc_code, 1 seq_no FROM dual
union all
SELECT 'DOMESTIC', 'B', 2 FROM dual
union all
SELECT 'DOMESTIC', 'C', 3 FROM dual),
xxa_test2
as (SELECT 1001 cust_no, 'Test' cust_name, 'B' loc_code FROM dual
union all
SELECT 1001 , 'Test' , 'C' FROM dual)
SELECT cust_no, cust_name, t2.loc_code, seq_no, min(seq_no) over() min_seq
FROM xxa_test2 t2,xxa_test1 t1
WHERE t2.loc_code = t1.loc_code)
WHERE seq_no = min_seq
SQL> /
   CUST_NO CUST L
      1001 Test B