Joshua Tolley schrieb:
On Sun, Jan 31, 2010 at 03:26:14AM +0100, Andreas wrote:
Hi,
is there a way to define a unique restraint on UPPER (textfield)?
E.g. mytable (
name_id serial PRIMARY KEY,
name varchar(255),
UNIQUE ( upper (name) )
)
psql throws a syntax error because of the upper() function.
I need to prohibit that 2 of strings like cow, Cow, CoW appears in
the name-column.
Like this:
5432 j...@josh# create table c (d text);
CREATE TABLE
5432 j...@josh*# create unique index c_ix on c (upper(d));
CREATE INDEX
5432 j...@josh*# insert into c (d) values ('text');
INSERT 0 1
5432 j...@josh*# insert into c (d) values ('tExt');
ERROR: duplicate key value violates unique constraint "c_ix"
Thanks for clearing this up. :)
It works with CREATE UNIQUE INDEX.
So I had the missconception that UNIQUE (...) within CREATE TABLE (...)
was actually just an shorter way to define a unique index which it is not.
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