SQL Query Validator

Paste your SQL query and validate it instantly. Get line-specific error messages in plain English, format your query, and catch dialect-specific issues before running it against your database.

Paste your SQL query above

Click to try a demo query

Frequently Asked Questions

Does this SQL validator connect to my database?

No. The SQL Query Validator is 100% client-side and works entirely in your browser. It performs static analysis without connecting to any database, so your queries and data are never transmitted to any server.

Which SQL dialects are supported?

MySQL, PostgreSQL, SQLite, and Microsoft SQL Server (MSSQL/T-SQL). The validator applies dialect-specific rules, such as flagging LIMIT in SQL Server or ILIKE in MySQL.

What does 'Format + Validate' do?

It validates your SQL for errors AND reformats it with consistent indentation, keyword capitalization, and line breaks. The formatted query replaces your input and can be copied separately.

Why does it warn about SELECT *?

SELECT * retrieves all columns from a table, which is inefficient on large tables and can cause issues when table schemas change. Best practice is to always specify the exact columns you need.

Can it validate stored procedures or complex PL/SQL?

The validator is designed for standard SQL SELECT, INSERT, UPDATE, DELETE, and DDL statements. Complex procedural code like PL/SQL blocks, stored procedures, or CTEs may not be fully validated.