Introducing RunSQL's SQL Validator

If you’ve ever spent way too long trying to debug an SQL query, you know how annoying it can get. Whether you’re a seasoned dev, a DBA, or just starting out, syntax errors can seriously mess with your flow.

That’s why the dbdiagram team put together this simple SQL Validator—it’s free and it’ll save you a ton of time.

Here’s what it does for you:

Missing Semicolon – Reminds you if you forget to add that pesky semicolon at the end.

SELECT * Queries – Suggests being more specific with your SELECT statements for better performance.

Missing WHERE Clause – Catches queries that could return too many rows and nudges you to add a WHERE clause.

JOIN/WHERE Index Checks – If you’ve got schema mode on, it’ll check whether your JOIN or WHERE columns are indexed.

Complex Subqueries, Window Functions, and LIKE with Leading Wildcards – Spots those performance bottlenecks and gives you suggestions like using CTEs or materialized views.

And much more!

Get Started

:point_right: Try it now: SQL Validator - No signup required.

It’s a little side project from the dbdiagram team, and we built it to make SQL just a little bit easier for you. No sign-ups, no hassle—just quick validation to help you get back to what you’re working on.

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