Hi Rob --- MySQL 5.
On Fri, Jul 18, 2008 at 3:01 PM, Rob Wultsch <[EMAIL PROTECTED]> wrote: > On Fri, Jul 18, 2008 at 2:00 PM, Jason Yergeau <[EMAIL PROTECTED]> wrote: >> I'm having trouble working through a data problem. Any tips or >> keywords that might clue me into a known pattern would be incredibly >> appreciated! >> >> I have about 500,000 users in my system. Each user has a points >> balance, updated by a system over which I have no control. I'd like >> to track changes to each user's point balance over time by taking >> timestamped snapshots of their balance, and saving it into a new >> table. >> >> It's easy to take the snapshot: >> >> insert into balances (userid, points) select userid, points from users; >> >> This quickly takes the points field from my users table, and saves it >> into a balances table, which saves the data along with a timestamp. I >> can run that query on a regular basis without overly taxing my system. >> >> The first time its run, I get 500,000 rows of data. That's fine. But >> the next time I run a query, I only want to save the differences in >> balance. >> >> Anyone have any tips? >> >> Best, >> Jason > > What version of mysql do you need this to work with? > > -- > Rob Wultsch > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
