Aggregates ignore NULL as per SQL standard, so this behaviour is valid. Martijn Tonies Database Workbench - development tool for MySQL, and more! Upscene Productions http://www.upscene.com My thoughts: http://blog.upscene.com/martijn/ Database development questions? Check the forum! http://www.databasedevelopmentforum.com
Thanks Visolve, Peter, This is a serious matter, because: - within a row: 1 + NULL = NULL - across rows with SUM(): 1 + NULL = 1 I know the manual says that group functions ignore NULL values (12.10.1), but it also says: Conceptually, NULL means "a missing unknown value" (3.3.4.6). IMHO a NULL with any value should always add to NULL. I was hoping for an option / setting to change NULL behaviour. Well, I will try the suggested alternatives. Thanks, Cor -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
