在PostgreSQL中删除带有外键的行

我想删除包含外键的行，但当我尝试这样的：

DELETE FROM osoby WHERE id_osoby='1'

我得到这个声明：

ERROR: update or delete on table “osoby” violates foreign key constraint “kontakty_ibfk_1” on table “kontakty”
DETAIL: Key (id_osoby)=(1) is still referenced from table “kontakty”.

如何删除这些行？

要自动化，可以使用ON DELETE CASCADE定义外键约束。
我引用 the manual of foreign key constraints：

CASCADE specifies that when a referenced row is deleted,row(s) referencing it should be automatically deleted as well.