SQL> SELECT VOUCHER_ID FROM PS_VCHR_MM_VW WHERE ROWNUM < 10;
VOUCHER_
--------
00003394
00003395
00003396
00003397
00003398
00003399
00003400
00003401
00003402
------------------------------------------------------------------------
set feedback on
1 SELECT VOUCHER_ID FROM PS_VCHR_MM_VW
2* WHERE VOUCHER_ID = '00003394'
SQL> /
VOUCHER_
--------
1 row selected.
----------------------------------------------------------------------------------
Zounds !!! Select dump(voucher_id) shows that Oracle is returning a null here.
Here a function is used to force the query to do full tablescans
1 SELECT VOUCHER_ID FROM PS_VCHR_MM_VW
2* WHERE CONCAT(VOUCHER_ID,'A') = CONCAT('00003394', 'A')
SQL> /
VOUCHER_
--------
00003394
-------------------------------------------------------------------------------------
I get the expected results if I force full table scans.
I looked at the explain plan for the failing query and rebuilt the ps_voucher index.
This
did not change its erroneous results. I rebuilt the view itself again to no avail. A
check on Metalink revealed bug 1852163. Although this bug's conditions were different
from the one above, their were some similarities. One workaround for bug 1852163
alter session set "_complex_view_merging" = true;
I tried this and the original query still gave improper results.
-----------------------------------------------------------------------------------------------
All queries against the component tables of the view work fine.
------------------------------------------------------------------------------------------
The view text is
CREATE VIEW SYSADM.PS_VCHR_MM_VW
AS
SELECT DISTINCT A.BUSINESS_UNIT, A.VOUCHER_ID, A.INVOICE_ID,
A.INVOICE_DT, A.PROCESS_INSTANCE, A.ENTRY_STATUS, A.POST_STATUS_AP,
A.MATCH_ACTION, C.PPV_POST_FLG, C.ERV_POST_FLG, A.ORIGIN FROM
SYSADM.PS_VOUCHER A, SYSADM.PS_PO_LINE_MATCHED C WHERE A.BUSINESS_UNIT =
C.BUSINESS_UNIT_AP AND A.VOUCHER_ID = C.VOUCHER_ID AND
A.MATCH_ACTION IN ('Y', 'E')
-------------------------------------------------------------------------------------
If I run the select statement outside of the view and tack on the 'voucher_id = '
clause
SELECT DISTINCT A.BUSINESS_UNIT, A.VOUCHER_ID, A.INVOICE_ID,
A.INVOICE_DT, A.PROCESS_INSTANCE, A.ENTRY_STATUS, A.POST_STATUS_AP,
A.MATCH_ACTION, C.PPV_POST_FLG, C.ERV_POST_FLG, A.ORIGIN FROM
SYSADM.PS_VOUCHER A, SYSADM.PS_PO_LINE_MATCHED C WHERE A.BUSINESS_UNIT =
C.BUSINESS_UNIT_AP AND A.VOUCHER_ID = C.VOUCHER_ID AND
A.MATCH_ACTION IN ('Y', 'E')
and a.voucher_id = '00003394'
/
I get the expected results. The query plan matches the one for the failing statement.
----------------------------------------------------------------------------------------------
If I select more than voucher_id from the view with the 'voucher_id = ' predicate
the other fields are projected correctly, but returns voucher_id as null.
===========================================================================================
Ian MacGregor
Stanford Linear Accelerator Center
[EMAIL PROTECTED]
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: MacGregor, Ian A.
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