ORA-02298 error
ORA-02298: cannot validate (A.TE_ID ) - parent keys not found
solution:
select xxxxx from child_table a where not exists (select 'x' from
parent_table where primary_key = a.key_values);
This will show you the row (or rows) that exists in the child table that
don't exist in the parent table. Once you have either (added rows
to the parent table to match the child rows) or (removed the child
rows that don't have parents), then you can enable your RI constraints
SQL> select count(te_id)
2 from A a
3 where not exists (select 1 from B tp where tp.te_id = a.te_id);
COUNT(TE_ID)
------------
15362
SQL>
SQL> delete from a
2 where not exists (select 1 from B tp where tp.te_id = a.te_id);
19573 rows deleted
SQL>
SQL> select count(te_id)
2 --delete from a
3 where not exists (select 1 from B tp where tp.te_id = a.te_id);
SQL>
SQL> select count(te_id)
2 --delete
3 from a
4 where not exists (select 1 from B tp where tp.te_id = a.te_id);
COUNT(TE_ID)--DELETE
--------------------
0
SQL> commit;
Commit complete
SQL> alter table a add constraint A_B_FK foreign key (TE_ID) references B (TE_ID);
Table altered
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