>Should you have a flag for the status "movement complete" ? I would say >yes but instead of a simple checkbox, you could store a date value. That >gives you two pieces of information > >a) if the date is null then the movement is not complete. >b) if the date is NOT null then the movement is complete and you know when >it finished.
There, Shawn and I disagree :-) In case of a very simple database, one could use NULL as a "flag" or "signal". But in general, I would avoid storing NULLs. Basics of database design: store what you know. Given that NULLs basically means the absence of a value (eg: unknown), you shouldn't be storing NULLs. 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 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
