Single Sub Row Query Returns More Than 1 Row!

Question

I am trying to update values in a table from another table and getting the error: Single Sub Row Query Returns More Than 1 Row.
I want table B's PRV_NAME updated into table A's PRV_NAME where A.PRVID = B.PRVID where B.PRV_TYPE = M'
Both tables have all unique PRVID's, however, table B has PRVID's that have the same name. So table B data can look like this:
PRVID PRV_NAME
1234 PHOENIX MED
1235 SAC MED
1236 SAC MED
1237 OVERLAND
etc..
So, as you can see the PRVID's are unique, but not the PRV_NAME's. Is this the reason why I get this error?
I did not build the tables and have no control over what is put in them. If this is the reason for the error, is there any way to resolve this?
For reference, here is the query. Maybe there is something wrong with this?
update msb_prv_source ps
set ps.prv_name =
(select prv00.prv00_prv_name
from prv00_prv prv00
join msb_prv_source ps
on prv00.prv00_prv_id = ps.prvid
where prv00.prv00_prv_type = 'M')
Edited by: user12296489 on Apr 19, 2013 10:46 AM

Answer 1

Hi,
user12296489 wrote:
I am trying to update values in a table from another table and getting the error: Single Sub Row Query Returns More Than 1 Row. Post your code. It's hard to say what you're doing wrong when I don't know what you're doing.
I want table B's PRV_NAME updated into table A's PRV_NAME where A.PRVID = B.PRVID
Both tables have all unique PRVID's, however, table B has PRVID's that have the same name. So table B data can look like this:
PRVIDIf b.prvid is really unique, then
UPDATE  a
SET     prv_name = (
                 SELECT  prv_name
                 FROM    b
                 WHERE   a.prvid     = b.prvid
;should work, whether the other columns are unique or not.
(Depending on your data and your requirements, you might want to use MERGE rather than UPDATE).
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
In the case of a DML operation (such as UPDATE) the sample data should show what the tables are like before the DML, and the results will be the contents of the changed table(s) after the DML.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ {message:id=9360002}
Edited by: Frank Kulash on Apr 19, 2013 2:00 PM
I see you've posted your code now:
update msb_prv_source ps
set ps.prv_name =
(select prv00.prv00_prv_name
from prv00_prv prv00
join msb_prv_source ps
on prv00.prv00_prv_id = ps.prvid
where prv00.prv00_prv_type = 'M')Even if ps.prvid is unique, the sub-query can return more than 1 row if prv00.prv00_prv_id is not unique. When that that's the case, what do you want to happen? Include examples when you post the sample data and desired results.