Validating field Across Three CSV Files

[megin1989]

Overview

Please replace this line with full information about your idea or problem. If it's a bug share as much as possible to reproduce it I have three CSV files: Screening, QeAdmin, and Demographics.

I need to validate that every PAT_MRN_ID in the Screening CSV matches the PAT_MRN_ID in both the QeAdmin and Demographics CSVs for the corresponding FACILITY_ID.

Please help me to resolve this.