Jason Hihn <jhihn(at)paytimepayroll(dot)com> writes:
> create table xy( x integer not null, y integer not null, primary key (x,y));
> create table xyz( x integer not null references xy(x), y integer not null
> references xy(y), z integer not null, primary key (x,y,z));
> ERROR: UNIQUE constraint matching given keys for referenced table "xy" not
> found
I think what you want is a two-column foreign key reference:
create table xyz( x integer not null, y integer not null, z integer not null,
primary key (x,y,z),
foreign key (x,y) references xy(x,y));
regards, tom lane