ETL and ELT
ETL transforms extracted data before loading it; ELT loads data before transformation.
Use this when A report imports and transforms data from another system.
without the term
“We pull data from the CRM every night into our reporting database, but if the job fails halfway and reruns, we get duplicate rows. Can you make the import reliable?”
with the term · How do you ask a model for ETL and ELT?
Build this data import with explicit transformation and rerun rules. Verify a repeated batch and a mid-run failure do not lose or double-count records.
What is ETL and ELT?
ETL transforms data before loading it into the destination; ELT loads raw data first and transforms it there. Either way, a rerun must not lose or duplicate rows.
Why does ETL and ELT matter when vibe coding?
An append-only import can duplicate rows every time a job retries.
How do you do ETL and ELT?
Define source identity, transformation rules, and rerun behavior with representative fixtures.
What goes wrong with ETL and ELT?
Transforming away source information needed to correct a later rule.