ETL vs. ELT

Transform-before-load versus load-then-transform, and why modern warehouses shifted the order.

Read

28 min

Practice MCQs

25

Interview QA

25

Edition

v4

Editorial status

Reviewed

Relevant for

Data Architect,Data Engineer,Forward Deployed Engineer (FDE)

Scope: BigQuery documentation current 2026-08-31; Apache Spark 4.2; Apache Airflow stable current 2026-08-31; Apache Iceberg and Parquet current 2026-08-31; PostgreSQL 18.