SQL Tester

Test and execute SQL queries instantly with our online SQL tester. Perfect for developers and students.

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4,972+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

The SQL Tester is a fully functional online tool that allows you to write, test, and execute SQL queries without any database setup. It includes multiple sample database schemas (Employees, Products, Orders) with realistic data. You can run SELECT, INSERT, UPDATE, and DELETE queries to see immediate results. The tool features syntax highlighting, query validation, and detailed execution feedback including execution time and affected rows. All processing happens client-side in your browser for maximum privacy and speed.

Save your calculation history with a free account

How to Use

Select a sample database schema from the dropdown menu
Write your SQL query in the text area (syntax highlighting will help)
Click 'Execute Query' to run the query
View the results in the output panel showing data, execution time, and affected rows
Use 'Reset Database' to restore the sample data to its original state

Frequently Asked Questions

Find Quick Answers

What SQL commands are supported?

The tool supports SELECT, INSERT, UPDATE, DELETE, and CREATE TABLE commands. It uses a JavaScript SQL engine that implements standard SQL syntax.

Is my data saved or sent to a server?

No, all processing happens entirely in your browser. Your queries and data never leave your computer, ensuring complete privacy.

Can I use my own database?

Currently, the tool only works with the provided sample databases. However, you can modify the sample data or create new tables using CREATE TABLE statements.

What happens if I run a destructive query?

You can always reset any database to its original sample state using the 'Reset Database' button. This will restore all tables and data.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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