Data Mapping Guide: Field Mapping, Schema Translation, and 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. |---|---|---|---|---| | crm.contacts | firstname | dw.customers | firstname | Direct copy | Empty string | | crm.contacts | lastname | dw.customers | lastname | Direct copy | Empty string | | crm.contacts | emailaddr | dw.customers | email | Lowercase | Skip row | | crm.contacts |…
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