This reminds me an old shell script used to housecleaning, which was performing first "for" loop based on an sql select to perform another "for" loop based on a

This reminds me an old shell script used to housecleaning, which was performing first "for" loop based on an sql select to perform another "for" loop based on another sql select and itering on returned items from the first request. Obviously the author of this script didnt know about sql joint. Reduced the work into one "for" loop and an custom sql join query as input, script running in less than 5 minutes compared to average 5hours before.