Fetch data from same table

Question

Hi All,
Oracle 10g
The data in cust_link_tab is of 2 systems. Internal and External.
I want to compare fields (date, ccy, type) of the below table on the basis of linking id.
currently i am using a query like this:
SELECT F.SOURCE,
case
     when fac.type = f.type then
     'Y'
     else 'N'
end fac_cusip
FROM cust_link_tab FAC, cust_link_tab F
WHERE
FAC.LINKING_ID = F.LINKING_ID
AND FAC.ROWID!=F.ROWID;
But if there is more than one linking_id. this won't work correctly.
SQL> DESC CUST_LINK_TAB;
Name Null? Type
FSRC_ID VARCHAR2(10)
SOURCE VARCHAR2(10)
DSRCL_ID VARCHAR2(10)
CCY VARCHAR2(3)
MATURITY_DATE DATE
GLOBAL_CMT NUMBER
LINKING_ID NUMBER
TYPE VARCHAR2(10)
SQL> select *from CUST_LINK_TAB;
FSRC_ID SOURCE DSRCL_ID CCY MATURITY_ GLOBAL_CMT LINKING_ID TYPE
111 INTERNAL 900 usd 1000 ER
45 EXTERNAL 600 usd 1000 TR
454 INTERNAL 700 usd 500 II
SQL>
Thanks.
Edited by: user545846 on May 9, 2009 10:17 PM

Answer 1

SQL> select *from CUST_LINK_TAB;
FSRC_ID SOURCE DSRCL_ID CCY MATURITY_ GLOBAL_CMT LINKING_ID TYPE
111 INTERNAL 900 USD 1000 ER
45 EXTERNAL 600 USD 1000 TR
454 INTERNAL 700 USD 500 II
32 INTERNAL 300 EUR 25 2885 PO
96 EXTERNAL 600 USD 434 2885 PO
Basically we need to compare the fields ccy, global_cmt,type for internal and external
source.
Linking id is used to link the data. we are expecting the fsrc_id,source,dsrcl_id and result whether 'Y' or 'N' which we can do using a decode or case statement.
source, fsrc_id and dsrcl_id are the primary keys (composite) for this table (cust_link_tab).
Apart from this we have the map table which keeps the fsrc_id, dsrcl_id, dsrcl_id of the
internal system and the corresponding external fsrc_id and dsrcl_id. The data is loaded using
the linking_id.
But this table does not maintain the details like ccy, maturity date, and type.
Please give your suggestions. thanks