Question

I need to go through every row in a table and set every date in a particular column to the date before its current value (minus 14 hours, previous day, etc).
I could write a script to do this but I was wondering if there was a better SQL method?

Thanks!

Answer 1

UPDATE yourtable SET thefield = thefield - interval '14 hour';

relevant docs here, which should have been your first place to check.