Question

I plan to delete data from a table, I would like to know how many and which tables have a foreign key reference to this particular table in Oracle. As I will have to set the foreign keys to null. I would like to know list of all tables which have a FK to this particular table.

Answer 1

SELECT d.table_name,

       d.constraint_name "Primary Constraint Name",

       b.constraint_name "Referenced Constraint Name"

FROM user_constraints d,

     (SELECT c.constraint_name,

             c.r_constraint_name,

             c.table_name

      FROM user_constraints c 

      WHERE table_name='EMPLOYEES' --your table name instead of EMPLOYEES

      AND constraint_type='R') b

WHERE d.constraint_name=b.r_constraint_name