first table t_Config having foreign key from all other 3 tables
and other three tables have foreign key from first table
All foreign keys from above tables allow null value
t_Config table is main table, Its having atleast one foreign key value present.
From other three tables at least one should have record with FK_Conf_id value from t_Config table.
I am not able to delete it individualy, How I can delete records from above tables?