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Nesting a select in a delete

Posted on 2004-08-03
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Last Modified: 2012-05-05
My problem is that whenever I use a nestedt select statement in my delete statment, and that select statement uses set arithmitic ie. union, minus, etc. I get an error (ORA-01732) stating that I cannot do this.  Is there some sort of easy work around without re-writing the scripts.
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Question by:rproud
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9 Comments
 
LVL 5

Expert Comment

by:FBIAGENT
ID: 11708486
pls post your query
0
 
LVL 35

Expert Comment

by:Mark Geerlings
ID: 11709049
You may be able to create a view that contains the "union" and/or "minus" operator, then do a simple select from the view in your sub-query for the delete statement.
0
 

Author Comment

by:rproud
ID: 11709449
don't have access to it at the moment but it was along the lines of:

(select t1.* from t1, t2
where t1.blah = t2.blah(+))
minus
(select t1.* from t1, t2
where t1.blah = t2.blah)
0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 
LVL 35

Accepted Solution

by:
Mark Geerlings earned 500 total points
ID: 11709712
This should give you the same results (maybe faster) and avoid the "set" operator:
select * from t1 where not exists (select 1 from t2 where t2.blah = t1.blah)
0
 

Author Comment

by:rproud
ID: 11709776
ok i'll make sure i can nest that in the delete statement tomorrow and award points if it works
0
 
LVL 13

Expert Comment

by:anand_2000v
ID: 11712109
can you post your entire delete statement?
0
 

Author Comment

by:rproud
ID: 11713723
delete from ((select t1.* from t1, t2
where t1.blah = t2.blah(+))
minus
(select t1.* from t1, t2
where t1.blah = t2.blah))
0
 
LVL 11

Expert Comment

by:vc01778
ID: 11715365
Why not just:

delete from t1 where blah not in (select blah from t2);

or (as Mark suggested):

delete from t1 a where not exist (select 1  from t2 where blah=a.blah);


VC
0
 
LVL 11

Expert Comment

by:vc01778
ID: 11715494
If,  for  whatever reason, you'd like to use  'minus',  you can do this:

delete from t1 where blah  in
(
select blah from
(
select * from t1
minus
select * from t2
)
)

VC
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

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