Hello Markus,
* Markus Schiltknecht <markus@xxxxxxxxxx>, [2006-10-05 11:16 +0200]:
> I've been trying to add a unique constraint on a row and a function
> result of a row. I.e.:
>
> CREATE TABLE test (
> id SERIAL PRIMARY KEY,
> t1 TEXT NOT NULL,
> t2 TEXT NOT NULL,
> UNIQUE (t1, lower(t2)));
>
> That fails with a syntax error (on 8.2beta1). While UNIQUE(t1, t2) works
> like a charm, it's not exactly what I want.
>
> I can easily create an index for my needs [1], why can I not add such a
> unique constraint?
You can create a unique index.
CREATE UNIQUE INDEX idx_name ON test (t1, lower(t2));
INSERT INTO test (t1, t2) VALUES ('some text', 'Other Text');
Trying to insert the following row:
INSERT INTO test (t1, t2) VALUES ('some text', 'other text');
you'll get a duplicate key error.
ciao,
ema
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