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update statement not working....

4
I have the following update statement bt it is not working, even after leaving it for 16 hrs it dint end and neighter any of the records got updated

update
allele_temp
set
allele_temp.AutoMarkerID =
(
select
distinct(marker_temp.AutoMarkerID)
from
marker_temp
where
marker_temp.dbSNPrsID = allele_temp.dbSNPrsID
)
where
allele_temp.AutoMarkerID is null

Can anyone tell me whts wrong in the query.
FYI
Allele_temp has 25.5 million records and
Marker_temp has 13.3 million records.

for a smaller dataset the query works fine
Aug 13 '07 #1
2 2344
debasisdas
8,127 Expert 4TB
As the table contains more records i would like to know is there any indexes on the table.
Aug 13 '07 #2
arr1
6
one question
Is the inner query returning one row?
If not then will update work this way for multiple records being returned?

thanks,
ARR
Aug 13 '07 #3

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