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create table p1(id int primary key)
go
create table p2(id int primary key)
go
create table f(id int )
go
alter table f add constraint fk_f_p1 foreign key (id) references p1(id)
go
alter table f add constraint fk_f_p2 foreign key (id) references p2(id)
go
drop table f , p1 ,p2
go