i have those tables :
我有那些表:
create table t_table(t1 int, constraint tprim primary key(t1));
create table parent_table(t1 int, p1 int, p2 int, constraint pprim primary key(t1, p1));
create table child_table(t1 int, c1 int, p1 int, constraint cprim primary key(t1, c1), constraint fchild foreign key (p1) references parent_table(p1));
create table t