How to implement Lag over in OWB?

Hi,
Could any one please explain, how we can implement lag over in OWB?
Thanks and regards
Gowtham Sen.

Hi Borkur,
Thanks for reply.
Actually I want to implement it in OWB. But after I got the answer from you, I decided to do in some othere way.
The way you mentioned is right when we are performing the operations directly on a table.
But in my scenario, an intermediate data is generating. I want to perform lag over operation on those records. Its possible by view.
So for performing operations for intermediate result, Oracle is providing Table Function concept. I can pass the result to it.
But the problem again is, how to implement the lag over operation there.
Any idea.?
Thanks and regards
Gowtham sen.

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Actually I want to implement it in OWB. But after I got the answer from you, I decided to do in some othere way.
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