> > Or this one: > > test=*# create unique index on log((case when state = 0 then 0 when > state = 1 then 1 else null end)); > CREATE INDEX > > > Now you can insert one '0' and one '1' - value - but no more.
Hi, A partial index would do the same, but requires less space: create unique index on log(state) WHERE state IN (0,1); best regards, Marc Mamin -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
