begin ; create table a ( id serial primary key , info text not null -- not interested here ) ;
create table b ( id serial primary key , a_id int not null references a , info text not null -- not interested here , actual bool not null ) ; create unique index b_actual on b ( a_id , ( case when actual then 0 else id end ) ) ; create table c ( id serial primary key , a_id int not null references a , info text not null -- not interested here , actual bool not null , unique ( a_id , ( case when actual then 0 else id end ) ) ) ; Why can i not define the unique constraint in the create table? I know this is described in the manual but why this is. thanks Andreas btw Why must i give the index a name. The name should be created automatically if none is specified as i define a unique constraint in the create table. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
