Lesson 1 / 25

ETL versus ELT

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.
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.

Quick check: What is the best first step for ETL versus ELT?

  • 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.