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UWINTWALI Jean de Dieu
UWINTWALI Jean de Dieu

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The SQL JOIN Cheatsheet You’ll Actually Use

When you're deep in a data problem, the last thing you want is to hesitate over INNER JOIN vs LEFT JOIN. SQL JOINs are fundamental but their subtleties often trip up even experienced developers.

To make this clearer, I’ve created a visual and code-based cheatsheet you can refer to in seconds, not minutes.

Visuals on the Gist

Why This Exists

Most JOIN tutorials either oversimplify or overwhelm. I wanted something between:

Code you can read like a sentence, paired with visuals that explain themselves.

This cheatsheet includes:

  • Clear examples for each JOIN type
  • Short comments that get to the point
  • Visuals that require no explanation

For Developers Who Don’t Like to Guess

If you already know SQL, this isn’t a lesson—it’s a reference.

You won’t find long paragraphs or bloated descriptions here. Just clean queries and concise visuals to validate your logic when it matters.

Use It Your Way

  • Keep it open when writing queries
  • Share with teammates
  • Fork and extend with your own examples

It’s open and ready to grow with you.

Explore the full cheatsheet here:

Visit my the Gist

If it helps you move faster and code with confidence, it’s done its job.

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