Where

Where

Where is a core part of PostgreSQL. In this case file you'll learn what it is, why it matters, and how to use it in real code.

Understanding where well means you can read other people's PostgreSQL code with confidence, and avoid the most common beginner mistakes in this area.

Key points:

• What where means in the context of PostgreSQL
• A minimal example you can run or read in the playground on the right
• A common mistake to avoid when working with where

-- PostgreSQL: Where
SELECT *
FROM agents
WHERE clearance_level > 0;

Tip: Try changing a value in the code on the right and re-running it — small experiments are the fastest way to build real intuition for where.