On Sat, 2009-04-18 at 21:22 -0700, meppum wrote:
> I noticed that there is a unique constraint and maybe that infers an
> index, but if it doesn't, why isn't an index on this column needed?

The unique constraint does provide an index. Otherwise inserts would be
very inefficient for the database, because it would have to sequential
scan the entire table before inserting a row.

Regards,
Malcolm



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