Re: Case Insensitive CHECK CONSTRAINTs

Shaw Terwilliger <sterwill@sourcegear.com> writes:
> I have a table with a TEXT field called "username".  I'd like to retain the=
> =20
> case of the data stored here, but I'd like all comparisons to be done witho=
> ut
> regard to case.  Since all these accesses _should_ be done through database=
> =20
> functions, I can simply lower() the input values and compare.  I also have
> an index created on lower(username), so lookups are quick.

> However, I'd also like to have some sort of table constraint to make sure=
> =20
> alternate case "duplicate" records don't creep into the table.  Any tips?

Make that index be UNIQUE.

BTW, please don't send HTML-coded mail to the lists.  It's a pain in the
neck to quote.

            regards, tom lane