> I'm using MySQL (4.0) version, which doesn't support subqueries, so I need to rewrite this as a join query...how would I > do that?
Well, here's a clumsy idea that gets the job done. Do an outer join (don't know the exact syntax for MySQL) that gets you two columns in each row: email address from classroom_access_list and email address from classroom_access_list. In your output, you just say if column 1 is blank, use column 2, otherwise, use column 1. The values will be deduped by virtue of the fact that equal values will collapse into a single row. HTH, Matthieu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Special thanks to the CF Community Suite Gold Sponsor - CFHosting.net http://www.cfhosting.net Message: http://www.houseoffusion.com/lists.cfm/link=i:4:184592 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
