I have one final table with 8 columns as
Billing document , date, net amount , tax amount, Gross amount, Cform serial no. , c form no. , c form amount
from above table i want to delete only c form amount if it is duplicate comparing. Cform serial no. , c form no. , c form amount, means if my data in those three fileds is repeating again i want to delete the c form amount by keeping remaining data as it is in the final table.