Question

I’m trying to do an UPDATE from a SELECT following the format given by this SO thread

It’s not working. I’m wondering if it’s because I need a different UPDATE…SELECT structure when performing calculations.

I’ve tried various versions of the following:

        UPDATE tbl_usertime uat
            SET uat.delay_qual = (TIMESTAMPDIFF(MINUTE, uat.view_date, '2011-10-11 15:22:25') > adt.delay), 
            freq_qual = (adt.frequency > uat.imps_today)
        FROM tbl_timing adt
        JOIN tbl_usertime uat 
            ON uat.ad_id = adt.ad_id;

…but it returns ‘error in SQL syntax…near ‘FROM tbl_timing adt JOIN tbl_usertime uat’

Any ideas?
Thanks!

Answer 1

The MySQL syntax is a little bit different, try this:

update tbl_usertime uat join tbl_timing adt on uat.ad_id=adt.ad_id set
    uat.delay_qual = (TIMESTAMPDIFF(MINUTE, uat.view_date, '2011-10-11 15:22:25') > adt.delay), 
        freq_qual = (adt.frequency > uat.imps_today)