SQL UNION vs UNION ALL Tool – Online Query Generator

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✅ Tool: SQL UNION vs UNION ALL Comparison Tool

🟢 Introduction

Use this tool to generate SQL queries with UNION or UNION ALL and understand the difference between them. Perfect for beginners and advanced users, this tool helps avoid duplicates (UNION) or retain them (UNION ALL) in your combined dataset results.

SQL UNION vs UNION ALL Tool













❓ How to Use

  1. Enter two valid SELECT queries with matching column counts.
  2. Choose either UNION or UNION ALL.
  3. Click Generate Query to get the combined SQL statement.

📚 FAQs

Q. What’s the difference between UNION and UNION ALL?

  • UNION removes duplicates.
  • UNION ALL includes all rows, even duplicates.

Q. When should I use UNION ALL?

  • When performance matters and duplicate removal isn’t needed.

Q. Are column names and types important?
Yes! Both SELECT queries must return the same number of columns with compatible data types.

✅ Conclusion

This tool is perfect for understanding and building correct multi-query SQL scripts using UNION and UNION ALL.
Explore more tools like our SQL Subquery Generator Tool for nested query building.
For a deep dive, check out W3Schools’ SQL UNION Guide.