Data Mapping: Field Mapping, Schema, Crosswalk Tables
Map fields between two data schemas: rename keys, cast types, split and merge columns, and document mappings in a crosswalk table for auditing.
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Tags: data, mapping, etl
Data Mapping Guide: Field Mapping, Schema Translation, and Crosswalk Tables Data mapping is the process of defining how fields in a source system correspond to fields in a target system. Every data integration project involves it — moving data between a CRM and a data warehouse, merging two acquired company databases, or feeding a third-party API. This guide covers how to design and document field mappings, build crosswalk tables, handle missing fields, and manage many-to-one and one-to-many relationships. --- What Data Mapping Actually Involves A data mapping document (or table) answers four questions for every field: Where does it come from? — Source system, table, and column name Where does it go? — Target system, table, and column name How is it transformed? — Direct copy, type cast,…
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