Thanks Santiago for the reply.
I will definitely try this.
one more question.
Is it possible to change all N values to Y in flag column if there is a Y value available for that ID?
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Tableau is (if used alone) read-only, so you can't really modify your data (I believe this is what you mean). What you can do is control what shows up on a viz, like we've done above!
Thanks you very much.
It worked very well.