Error when I change UNION to UNION ALL

Question

Hi,
In the SQL below, I have a union in which I dont care about duplicates (in fact I know there wont be any). Hence, I want to avoid any overhead of sorting and checking for same, by replacing it with UNION ALL. The SQL runs fine with UNION, but complains when I change it to UNION ALL, which I cannot explain. The error message is "Error: java.sql.SQLException: ORA-00936: missing expression, SQL State: 42000, Error Code: 936"
Here is the SQL:
SELECT activ_I, activ_C, cases.I_OCCASTYP_CASES, cases.C_OCCASTYP_CASES FROM TOCCASE cases JOIN (
SELECT I activ_I, C activ_C, I_OCCASE_RESULTINGFROM, C_OCCASE_RESULTINGFROM FROM TOCPROCESSINSTANCE activ JOIN (
SELECT I_OCACTVTY_CHANGES, C_OCACTVTY_CHANGES FROM TOCTransferActivityChange x
WHERE I_TO IN (2)
AND C_TO = 1009
AND CHANGEDATE <= to_date('2009-05-16 00:00:00','YYYY-MM-DD HH24:MI:SS')
AND CHANGEDATE = (SELECT MAX(z.CHANGEDATE) FROM TOCTransferActivityChange z WHERE z.I_OCACTVTY_CHANGES = x.I_OCACTVTY_CHANGES AND z.C_OCACTVTY_CHANGES = x.C_OCACTVTY_CHANGES)
) latest_user_tx ON activ.I = latest_user_tx.I_OCACTVTY_CHANGES AND activ.C = latest_user_tx.C_OCACTVTY_CHANGES
WHERE activ.C = 11200 AND activ.I_OCCASE_RESULTINGFROM IS NOT NULL AND activ.C_OCCASE_RESULTINGFROM IS NOT NULL
UNION ALL (
SELECT I activ_I, C activ_C, I_OCCASE_RESULTINGFROM, C_OCCASE_RESULTINGFROM FROM TOCTASK activ JOIN (
SELECT I_OCACTVTY_CHANGES, C_OCACTVTY_CHANGES FROM TOCTransferActivityChange x
WHERE I_TO IN (2)
AND C_TO = 1009
AND CHANGEDATE <= to_date('2009-05-16 00:00:00','YYYY-MM-DD HH24:MI:SS')
AND CHANGEDATE = (SELECT MAX(z.CHANGEDATE) FROM TOCTransferActivityChange z WHERE z.I_OCACTVTY_CHANGES = x.I_OCACTVTY_CHANGES AND z.C_OCACTVTY_CHANGES = x.C_OCACTVTY_CHANGES)
) latest_user_tx ON activ.I = latest_user_tx.I_OCACTVTY_CHANGES AND activ.C = latest_user_tx.C_OCACTVTY_CHANGES
WHERE activ.C = 11554 AND activ.I_OCCASE_RESULTINGFROM IS NOT NULL AND activ.C_OCCASE_RESULTINGFROM IS NOT NULL
) activity_transfers ON activity_transfers.I_OCCASE_RESULTINGFROM = cases.I AND activity_transfers.C_OCCASE_RESULTINGFROM = cases.C
If I run the UNION ALL as is without the join to TOCCASE it works fine as well. The columns in each part of the union are the same so I have no idea why its failing.
I am running the following version of Oracle:
"Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production" (as returned from "select * from v$version")
thanks for any info
Edited by: user11176141 on 18-May-2009 03:15

Answer 1

Thanks for the input!
When I remove the bracket after the ALL keyword, I get the an error "Error: java.sql.SQLException: ORA-00920: invalid relational operator
, SQL State: 42000, Error Code: 920". I assume this is because I had a corresponding closing bracket, so I removed that as well. However, I now get the error "Error: java.sql.SQLException: ORA-00920: invalid relational operator, SQL State: 42000, Error Code: 920". so as it is now the SQL reads
SELECT activ_I, activ_C, cases.I_OCCASTYP_CASES, cases.C_OCCASTYP_CASES FROM TOCCASE cases JOIN (
SELECT I activ_I, C activ_C, I_OCCASE_RESULTINGFROM, C_OCCASE_RESULTINGFROM FROM TOCPROCESSINSTANCE activ JOIN (
SELECT I_OCACTVTY_CHANGES, C_OCACTVTY_CHANGES FROM TOCTransferActivityChange x
WHERE I_TO IN (2)
AND C_TO = 1009
AND CHANGEDATE <= to_date('2009-05-16 00:00:00','YYYY-MM-DD HH24:MI:SS')
AND CHANGEDATE = (SELECT MAX(z.CHANGEDATE) FROM TOCTransferActivityChange z WHERE z.I_OCACTVTY_CHANGES = x.I_OCACTVTY_CHANGES AND z.C_OCACTVTY_CHANGES = x.C_OCACTVTY_CHANGES)
) latest_user_tx ON activ.I = latest_user_tx.I_OCACTVTY_CHANGES AND activ.C = latest_user_tx.C_OCACTVTY_CHANGES
WHERE activ.C = 11200 AND activ.I_OCCASE_RESULTINGFROM IS NOT NULL AND activ.C_OCCASE_RESULTINGFROM IS NOT NULL
UNION ALL
SELECT I activ_I, C activ_C, I_OCCASE_RESULTINGFROM, C_OCCASE_RESULTINGFROM FROM TOCTASK activ JOIN (
SELECT I_OCACTVTY_CHANGES, C_OCACTVTY_CHANGES FROM TOCTransferActivityChange x
WHERE I_TO IN (2)
AND C_TO = 1009
AND CHANGEDATE <= to_date('2009-05-16 00:00:00','YYYY-MM-DD HH24:MI:SS')
AND CHANGEDATE = (SELECT MAX(z.CHANGEDATE) FROM TOCTransferActivityChange z WHERE z.I_OCACTVTY_CHANGES = x.I_OCACTVTY_CHANGES AND z.C_OCACTVTY_CHANGES = x.C_OCACTVTY_CHANGES)
) latest_user_tx ON activ.I = latest_user_tx.I_OCACTVTY_CHANGES AND activ.C = latest_user_tx.C_OCACTVTY_CHANGES
WHERE activ.C = 11554 AND activ.I_OCCASE_RESULTINGFROM IS NOT NULL AND activ.C_OCCASE_RESULTINGFROM IS NOT NULL
) activity_transfers ON activity_transfers.I_OCCASE_RESULTINGFROM = cases.I AND activity_transfers.C_OCCASE_RESULTINGFROM = cases.C