Truncating table throws error although no child record exists

Question

I have 2 tables
table_master (This is master table)
table_child (This is child table)
truncate table table_child ;
the above executes properly
BUT
truncate table table_master;
ERROR at line 1:
ORA-02266: unique/primary keys in table referenced by enabled foreign keys
Although there is no child record even though the above error is occuring.Please sove my problem.

Answer 1

Hi,
>>lthough there is no child record even though the above error is occuring.Please sove my problem.
In fact, doesn't matter if child table contain or not data.
LEGATTI> create table a (id number primary key);
Table created.
LEGATTI> create table b (id number constraint fk_b_a references a);
Table created.
LEGATTI> truncate table a;
truncate table a
ERROR at line 1:
ORA-02266: unique/primary keys in table referenced by enabled foreign keys
LEGATTI> alter table b disable constraint fk_b_a;
Table altered.
LEGATTI> truncate table a;
Table truncated.
-- In addition, in order to drop the parent table, just disable the constraint's child table is not sufficient.
LEGATTI> select constraint_name,status from user_constraints where table_name='B';
CONSTRAINT_NAME                STATUS
FK_B_A                         DISABLED
LEGATTI> drop table a;
drop table a
ERROR at line 1:
ORA-02449: unique/primary keys in table referenced by foreign keys
LEGATTI> drop table a cascade constraints;
Table dropped.
LEGATTI> select * from user_constraints where table_name='B';
no rows selectedCheers
Legatti