Re: DELETE WHERE EXISTS unexpected results

The second example you gave worked for me. Thanks Carla !

D. Jeff Bland
z/OS System House Installation and Packaging (zSHIP)
BLAND at IBMUS
bland(at)us(dot)ibm(dot)com
http://w3.pok.ibm.com/zos/i95a/
845-435-4210 8/295-4210
Famous quote: Beauty is in the eye of the beer holder.

From:
Carla <cgourofino(at)hotmail(dot)com>
To:
Jeff Bland/Poughkeepsie/IBM(at)IBMUS
Cc:
pgsql-sql(at)postgresql(dot)org
Date:
12/01/2010 08:05 AM
Subject:
Re: [SQL] DELETE WHERE EXISTS unexpected results
Sent by:
cgourofino(at)gmail(dot)com

You don't have to include the name of the "delete table" in the subselect.

Wrong:

DELETE FROM SP.TST_USER_TBL WHERE EXISTS
(SELECT SP.TST_USER_TBL.NAME FROM SP.TST_USER_TBL, SP.TST_OWNER_TBL WHERE
TYPE='BLAND' AND PLACE='HOME' AND SP.TST_OWNER_TBL.NAME=
SP.TST_USER_TBL.NAME)

Right:

DELETE FROM SP.TST_USER_TBL WHERE EXISTS
(SELECT SP.TST_USER_TBL.NAME FROM SP.TST_OWNER_TBL WHERE TYPE='BLAND'
AND PLACE='HOME' AND SP.TST_OWNER_TBL.NAME=SP.TST_USER_TBL.NAME)

Or:

DELETE FROM SP.TST_USER_TBL WHERE PLACE = 'HOME' AND NAME IN (SELECT NAME
FROM SP.TST_OWNER_TBL WHERE TYPE = 'BLAND');

Carla O.

2010/11/30 Jeff Bland <bland(at)us(dot)ibm(dot)com>

I want to delete certain rows from table USER_TBL.
Two tables are involved. USER_TBL and OWNER_TBL.

The entries that match BLAND type in OWNER table and who also have a
matching entry in USER table NAME but only for USER_TBL entries with
places equal to HOME.

DELETE FROM SP.TST_USER_TBL WHERE EXISTS
(SELECT SP.TST_USER_TBL.NAME FROM SP.TST_USER_TBL, SP.TST_OWNER_TBL WHERE
TYPE='BLAND' AND PLACE='HOME' AND SP.TST_OWNER_TBL.NAME=
SP.TST_USER_TBL.NAME)

Example :

OWNER_TBL USER_TBL

NAME TYPE PLACE NAME
BLAND BLAND WORK
BLAND
LARRY BLAND HOME
BLAND
MOE BLAND HOME LARRY
CURLY BLAND WORK
LARRY
JOE BLAND HOME MOE

In the end I expect the USER_TBL to not contain the 3 HOME entries.
But what is happening is the whole USER_TBL is empty after the query.

Any ideas or tips.. Thanks.