On Mon, 2011-03-07 at 23:30 +0000, Ruben Blanco wrote:
> Hi:
>
> Is there anyway to create a unique index or constraint on part of a
> column?
>
> Something like this, but something that works ;-)
>
> ALTER TABLE invoices
> ADD CONSTRAINT cons UNIQUE (EXTRACT(YEAR FROM invoice_date),
> innvoice_number);
CREATE UNIQUE INDEX invoices_constraint_idx ON invoices
(EXTRACT(YEAR FROM invoice_date), invoice_number);
Regards,
Jeff Davis
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