SQL Join Visualizer

How to use this developer tool

1. Paste the sql select with joins or load a local text file.
2. Adjust the available checks or parsing options.
3. Select Visualize Joins or press Ctrl/Cmd + Enter.
4. Review the summary, detailed output, and structured export before using the result.

What this developer tool does

Turn the FROM and JOIN clauses of a SELECT query into a compact relationship outline. Each edge shows the join type, alias, target table, and ON or USING condition, which makes a long query easier to review before opening it in a database console.

The visualization is textual and does not infer keys or cardinality. Subqueries and vendor-specific join operators may be summarized imperfectly.

Example

The bundled sample demonstrates the expected input. Select Sample, run the analyzer, and compare the detailed output with the summary metrics.

SELECT o.id, c.name, p.status
FROM orders o
LEFT JOIN customers c ON c.id = o.customer_id
INNER JOIN payments p ON p.order_id = o.id;

Use cases

• Pre-commit and code-review checks
• Query or repository troubleshooting
• Generating copy-ready diagnostics for an issue

Tips for reliable output

• Use the exact text that the target system will receive.
• Keep dialect- or policy-specific options aligned with your project.
• Review warnings even when the main result is valid.
• Save structured JSON when another script needs the findings.
• Confirm destructive operations in the real environment separately.

Processing details

Normalizes SQL whitespace outside quoted strings, identifies the base relation, and parses successive JOIN clauses into ordered edges.

The visualization is textual and does not infer keys or cardinality. Subqueries and vendor-specific join operators may be summarized imperfectly.