Checking for Duplicate Values in a Field

[santhana]

Hello Friends

I have a field - Mobile Number.  In case a mobile number  in current quarter is also available upto the end of previous quarter I want to mark them as Duplicate.

Kindly help to achieve above result.

Thanks & Regards

Santhana

[mrtinsjoao]

Great day
You can count if exists reincidence with this code in script

IF(PEEK([x])=[x],PEEK([cont x])+1,0) as [cont verify x]