Yeahh.The filename sounds ugly but i really need one catchy name because my desktop is kind of mess.

I have tried ur method, but it doesnt work in this case. What i mean with redundant data is two consequence rows that has same Serial No and Operation No. BAsically,they may have same Serial No, but different Operation No can mean they are different data anyway. Only then the redundancy will be deleted automatically.

So the matter of redundant or not, will be identified by both Serial No and Operation No, not by only of them.

I hope you gus can help me this.