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"
--
Joshua Tolley / eggyknap
End Point Corporation
http://www.endpoint.com
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