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Please find the below the script that i have used. Kindly note that i have used two apply map functions to check the feasibility of the Applymap functions based on two diff common keys.
Kindly look into this and provide me a solution
I did not download your sample files, but if you're trying to map 'Dates', it's important that you make sure both date formats from source to target table are the same. If you are getting nulls values, this could be the reason.