Hi John, If judicious transformation of data makes it easier to do the queries you want, then you should consider it. ETL isn't a common acronym in the database world just because we like three letters =) Though it depends on how often you're doing this, if it's one-off then it's probably not worth it, though I was making the assumption you're probably going to be using that query frequently.
Regards, Gavin Towey -----Original Message----- From: John Meyer [mailto:johnme...@pueblocomputing.com] Sent: Wednesday, September 16, 2009 4:51 PM To: Gavin Towey Cc: mysql@lists.mysql.com Subject: Re: Datediff function Gavin Towey wrote: > Hi John, > > You can't use aggregate function in the WHERE clause, because they aren't > evaluated until after the WHERE clause is applied. > > Wouldn't it be much easier to simply keep a last_tweet_date field updated > somewhere then simply do > SELECT USER_NAME FROM USERS WHERE last_tweet_date < NOW()-INTERVAL 7 DAY; ? > > Regards, > Gavin Towey > I don't know if that would be so simple. I'd have to run programming logic when I fetch the information off the twitter server. I just hoped that there was a way to do it through SQL. The information contained in this transmission may contain privileged and confidential information. It is intended only for the use of the person(s) named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
