Hi world,
I wanted to test if char and varchar can be cross-referenced as foreign key. So i did these tests :
1) Can a varchar(7) reference a char(2) ? PostgreSQL accepts it
create table t1 (id char(2) primary key, data text);
create table t2 (id char(2) primary key, data text, id_t1 varchar(7) references t1 (id));
2) Can a varchar(7) reference a char(7) ? PostgreSQL accepts it
create table t3 (id char(7) primary key, data text);
create table t4 (id char(7) primary key, data text, id_t3 varchar(7) references t3 (id));
3) Can a char(2) reference a varchar(7) ? PostgreSQL accepts it.
create table t5 (id varchar(7) primary key, data text);
create table t6 (id char(7) primary key, data text, id_t5 char(2) references t5 (id));
3.1) I am very surprised to be able do that :
-> insert into t5 (id,data) values ('1','toto');
