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SQL>
SQL> create table p ( pk int primary key )
2 /
Table created.
SQL> create table c
2 ( fk constraint c_fk
3 references p(pk)
4 deferrable
5 initially immediate
6 )
7 /
Table created.
SQL> insert into p values ( 1 );
1 row created.
SQL> insert into c values ( 1 );
1 row created.
SQL>
SQL> update p set pk = 2;
update p set pk = 2
*
ERROR at line 1:
ORA-02292: integrity constraint (JAVA2S.C_FK) violated - child record found
SQL>
SQL> set constraint c_fk deferred;
Constraint set.
SQL>
SQL> update p set pk = 2;
1 row updated.
SQL>
SQL> set constraint c_fk immediate;
set constraint c_fk immediate
*
ERROR at line 1:
ORA-02291: integrity constraint (JAVA2S.C_FK) violated - parent key not found
SQL>
SQL> update c set fk = 2;
1 row updated.
SQL>
SQL> set constraint c_fk immediate;
Constraint set.
SQL>
SQL> drop table p;
drop table p
*
ERROR at line 1:
ORA-02449: unique/primary keys in table referenced by foreign keys
SQL> drop table c;
Table dropped.
SQL>
SQL>
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