Question

i have two tables that are joined on a field rowid

i need to delete rows from calibration that match a specific condition based on a different table

there are approximately 50000 rows in batchinfo and 3 million rows in calibration

here is my sql statement:

delete from calibration where rowid in (

select calibration.rowid from batchinfo 
join calibration on batchinfo.rowid=calibration.rowid
where reporttime not like '%2011%')

this is taking hours!!

what can i do to speed this up?

Answer 1

delete c
from batchinfo b
join calibration c
    on batchinfo.rowid=calibration.rowid
where reporttime not like '%2011%'