You should bind those subqueries to table aliases or this gets really confusing. I'll bet something is just not getting bound correctly.
This is more clear: SELECT UserID, Description FROM dbo.UserCredentials all_credentials WHERE EXISTS ( SELECT * FROM dbo.UserCredentials keypad_credentials WHERE all_credentials.UserID = keypad_credentials.UserID AND keypad_credentials.Description = 'Keypad' ) AND NOT EXISTS ( SELECT * FROM dbo.UserCredentials stripe_credentials WHERE all_credentials.UserID = stripe_credentials.UserID AND stripe_credentials.Description = 'Magnetic Stripe Card' ) Another thing that is weird is the way you've written that original select statement: that's not going to return users. It will return user-description combinations, and since you said you want "users" only, you should probably just get a list only of the users themselves: SELECT DISTINCT all_credentials.UserID On Mon, Aug 4, 2014 at 2:46 PM, Glenn Little <[email protected]> wrote: > Okay, having some trouble getting [NOT] EXISTS working with my one-table > example. No more colors etc, here is the actual code. Basically, I have a > table: > > UserCredentials: > UserID: int > CredentialNumber: int > Description: varchar > > I want to find the UserID of all users who have a "Keypad" credential, but > do *not* have a "Magnetic Stripe Card" credential. > > Here is my latest try, but unfortunately it returns all rows in the table, > not just the keypad-only ones: > > SELECT UserID as id, Description from dbo.UserCredentials WHERE > EXISTS ( > SELECT * FROM dbo.UserCredentials WHERE UserID = id AND Description = > 'Keypad' > ) > AND NOT EXISTS ( > SELECT * FROM dbo.UserCredentials WHERE UserID = id AND Description = > 'Magnetic Stripe Card'); > > I think I'm getting confused about how to get the "iterating" user id into > the conditions? > > -glenn > > -- > -- > SD Ruby mailing list > [email protected] > http://groups.google.com/group/sdruby > --- > You received this message because you are subscribed to the Google Groups > "SD Ruby" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- SD Ruby mailing list [email protected] http://groups.google.com/group/sdruby --- You received this message because you are subscribed to the Google Groups "SD Ruby" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
