Markos wrote:
> CREATE TABLE user (
>     id_user integer PRIMARY KEY,
>     ...
> CREATE TABLE loan (
>     ...
>     FOREIGN KEY(id_admin_loan, id_admin_devolution) REFERENCES user(id_user, 
> id_user)

I do not understand what this is trying to accomplish.
Why not two single-column FK constraints?

> Error: foreign key mismatch - "loan" referencing "user"

Because there is no unique index on (id_user,id_user).


Regards,
Clemens
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