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SQL Join Visualizer — See Inner, Left, Right & Full Join Results

See exactly what each SQL join type returns — INNER, LEFT, RIGHT, FULL OUTER — using sample tables where matching and non-matching rows are visually highlighted, instead of trying to hold the Venn-diagram mental model in your head every time you write a join.

How to use SQL Join Viz

1. Choose a join type.
2. View the sample tables side by side.
3. See which rows the join includes, highlighted.
4. Try different join types on the same data to compare.

Frequently asked questions

What is the difference between LEFT JOIN and INNER JOIN?

INNER JOIN returns only rows with a match in both tables; LEFT JOIN returns all rows from the left table regardless of a match, filling unmatched columns with NULL — the visualization makes this difference immediately visible.

Can I use my own sample data instead of the defaults?

Yes — edit the sample table data to test how a join behaves with your own row structure.

Does it generate the actual SQL syntax too?

Yes — the corresponding JOIN syntax is shown alongside the visualization for each join type.

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Also searched for: sql join types visualizer · left join vs inner join explained · sql join venn diagram interactive

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