Hello, What is the best way to implement a column that can be null, but if not null, must be unique?
Regards, Stephen Markson The Pharmacy Examining Board of Canada 416.979.2431 x251 -- You received this message because you are subscribed to the Google Groups "RBASE-L" 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.
