table balances
(SSN
BALANCE_TYPE_ID
BALANCE_NAME
BALANCE_DIMENSION_ID
JURISDICTION_CODE
AMOUNT
FLAG )


i want to enforce unique constraint on the above table , for the combination of ssn and balance_type_id,
but since the combiantion has dupilcate values, i am not able to enforce it.is there any way
to find duplicate values for this particular unique combination,so that i can delate it and enforce the unique
constraint.