SQL Server Online Compiler | Free Online Compiler

T-SQL

CREATE TABLE orders (id INTEGER PRIMARY KEY, customer TEXT, total REAL);
INSERT INTO orders (customer, total) VALUES ('Asha', 120.50), ('Noah', 75.25), ('Lia', 42.00);
SELECT * FROM orders WHERE total > 60;

In-browser runner uses SQLite for demo SQL execution.

Results

What Is the SQL Server Online Compiler?

A free browser-based T-SQL editor that lets you write and run SQL Server-style queries without installing anything. Practice SELECT, INSERT, UPDATE, DELETE, JOINs, CTEs, subqueries, and aggregate functions. Results are displayed as formatted tables so you can verify query logic instantly.

How It Works

The compiler loads a SQL engine (sql.js compiled to WebAssembly) directly in your browser. Write T-SQL in the editor, click Run, and see results rendered as tables. The engine executes standard SQL syntax compatible with SQL Server conventions including JOINs, GROUP BY, HAVING, and Common Table Expressions. No server or SQL Server installation is needed.

Step-by-Step Example

Create a table using CREATE TABLE with columns and data types.
Insert sample rows with INSERT INTO statements.
Run a SELECT query with a WHERE clause to filter results.
Use a JOIN to combine data from multiple tables.
View the formatted table results in the output panel.

Use Cases

Learning T-SQL syntax and SQL Server query patterns
Practicing JOINs, CTEs, and window functions interactively
Testing queries before running them on production SQL Server databases
Preparing for SQL Server certification exams and database interviews
Prototyping schema designs and validating data relationships

Limitations & Notes

This is a browser-based simulation, not a real SQL Server instance.
Stored procedures, triggers, and some T-SQL-specific features may not be available.
All data resets when the page is refreshed; there is no persistent storage.
Temporary tables and table variables may have limited support.
Performance depends on your browser and device; not intended for production use.

Frequently Asked Questions

Is this a real SQL Server instance?

No, it simulates SQL Server T-SQL execution in the browser. No real SQL Server connection is involved.

What T-SQL features are supported?

Common T-SQL features including SELECT, INSERT, UPDATE, DELETE, JOINs, subqueries, and aggregate functions are supported.

Can I use stored procedures?

Stored procedure support is limited in this browser-based environment. Basic query execution is the primary focus.

Are CTEs supported?

Yes, Common Table Expressions (WITH clauses) are supported and work as expected for building readable queries.

Can I use temporary tables?

Temporary table support may be limited. Standard CREATE TABLE statements work for creating regular tables.

Is my data persistent?

No. All tables and data reset when you refresh the page. Each session starts with a fresh database.

What SQL engine does this use?

It uses a browser-based SQL engine (sql.js) that follows T-SQL conventions for query execution.

Are system functions supported?

Common system functions are supported. Some SQL Server-specific system functions may not be available in this browser environment.

SQL Server Compiler