What is CSV, Excel, and text file extraction?

< 1 min read

CSV, Excel, and text file extraction means loading data from files into the database instead of connecting to an application DB.
In my project, vendors shared daily sales data as CSV through SFTP.
We mapped columns to staging tables and validated formats before loading.
Excel files were used by internal teams for manual uploads like pricing updates.
Text files (delimited or fixed width) came from legacy systems.
We handled issues like encoding, date format mismatch, and extra columns.
A preprocessing step checked header names and record counts.
After validation, ETL moved data to warehouse tables for reporting.
It’s common in integrations where APIs or DB access are unavailable.

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