The parser does not execute the query before it parses it. Thus you cannot do that. Use Code, and or have an idea what the INTERVAL UNIT is prior to executing the query.
- Dathan Vance Pattishall - Sr. Programmer and mySQL DBA for FriendFinder Inc. - http://friendfinder.com/go/p40688 -->-----Original Message----- -->From: Erik Osterman [mailto:[EMAIL PROTECTED] -->Sent: Wednesday, November 12, 2003 4:05 AM -->To: [EMAIL PROTECTED] -->Subject: A question on INTERVAL --> --> -->I would like to do something like this.... --> -->SELECT * FROM orders,subscriptions --> WHERE orders.subscription_id = subscriptions.id --> created < created - INTERVAL subscriptions.term subscriptions.unit; --> -->But I get "ERROR 1064: You have an error in your SQL syntax near -->'subscriptions.unit)'" --> -->If I replace subscriptions.unit to 'YEAR' it works fine. --> -->The 'subscriptions' table has 2 columns: term (int) and unit (enum). -->The enum types for unit are 'YEAR', 'MONTH', etc... --> -->Anyone have any ideas on how to use MySQL's wonderful date & time -->functions -->to accomplish what I am trying to do? I'd like to avoid using approximate -->techniques such as using 86400 seconds for a day, since calculating -->months -->and years _accurately_ is very involved. --> --> -->P.S. DATE_SUB(created, INTERVAL subscriptions.term subscriptions.unit) -->had -->the same parse error. --> --> -->Regards, --> -->Erik Osterman --> --> --> --> -->-- -->MySQL General Mailing List -->For list archives: http://lists.mysql.com/mysql -->To unsubscribe: -->http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
