# ETL versus ELT — ETL / ELT Pipelines

Source: https://www.geekswithgeeks.com/en/etl-elt/etl-elt-01

> Apply ETL versus ELT with clear evidence.

## Understand ETL versus ELT

For **ETL versus ELT**, begin with the problem it solves. Identify the inputs, constraints, and observable outcome before choosing an implementation.

## See the workflow

Use this path while practising **ETL versus ELT**: understand, act, verify, and improve.

![Workflow for ETL versus ELT.](assets/figures/etl-elt/section-1-map.svg) — Figure 1.1 — A repeatable workflow.

## A useful comparison

**ETL versus ELT** is like a route plan: it keeps each step connected to a destination.

Check your reasoning.

**Quiz:** What is the best first step for ETL versus ELT?

- [x] Define the goal and constraints.
- [ ] Copy an unverified example.
- [ ] Skip measurement.

*Answer:* Define the goal and constraints.. A clear goal and constraints make decisions reviewable.