How do I compare two SQL queries?

Paste the two versions, click Beautify to normalize keyword case and indentation on both sides, then Compare. The diff highlights changed clauses word by word.

Is this a real SQL syntax checker?

It is a parser-based check: if the formatter can parse the statement, it is marked valid; if not, you see the error and the offending token. It checks syntax, not whether tables or columns exist.

Which SQL dialects are supported?

The formatter follows standard SQL, which covers the shared syntax of PostgreSQL, MySQL, SQL Server and SQLite well. Heavily dialect-specific constructs may be flagged even though your database accepts them.

Can I compare whole schema dumps?

Yes — files up to 10 MB work, and large comparisons run in a background worker. For dump files, enabling the sort-lines option can help when object order differs between dumps.

Why format before comparing?

Formatting both sides with identical rules removes style-only differences — keyword case, line breaks, indentation — so the diff shows logic changes only.

Is my SQL uploaded anywhere?

No. Formatting, syntax checking and comparison all run in your browser. Nothing is transmitted or stored.

Runs entirely in your browser

Compare Two SQL Queries Online

Paste two SQL scripts to see every difference highlighted — with a one-click formatter that normalizes keywords and indentation, and a live syntax check.

Original text

0 lines · 0 characters

Changed text

0 lines · 0 characters

Paste or drop text into both boxes, then press Compare.

Everything runs in your browser — nothing is uploaded.

How to compare two SQL queries

1
Paste both versions
Add the two queries or scripts — from a migration file, a stored procedure, an ORM log or a schema dump. A live syntax check flags malformed statements.
2
Format to normalize
Click Beautify: keywords are uppercased and clauses are indented consistently on both sides, so style differences stop polluting the diff.
3
Compare & review
Run the comparison to see added, removed and edited clauses — a changed column, a new JOIN, a different WHERE condition — highlighted word by word.

SQL Compare showing an example comparison result with differences highlighted

Spot the real change between two queries

SQL is where formatting differences hurt the most: one developer writes keywords lowercase, another splits every column onto its own line, and suddenly two nearly-identical queries look completely different. This tool formats both sides with identical rules — uppercase keywords, consistent indentation — before comparing, so the diff shows what actually changed in the logic.

The formatter's parser doubles as a pragmatic syntax checker: while you type, each panel shows whether the SQL parses cleanly, and malformed statements are flagged with the offending token. It follows standard SQL and understands the common syntax of major dialects.

Typical uses: reviewing migration scripts before they run, comparing a stored procedure between staging and production, checking what an ORM actually changed in its generated SQL, or diffing two schema dumps after a deployment.

As with every tool on this site, your SQL never leaves the browser — safe for queries that embed table names, business logic or credentials in connection comments.

FAQ

SQL comparison — frequently asked questions

More comparison tools

JSON Compare

Key-order aware JSON diff, formatter and validator

XML Compare

Diff, beautify and validate XML documents

YAML Compare

Diff and validate YAML configs

HTML Compare

Diff and beautify HTML markup

CSS Compare

Diff and beautify stylesheets

Text Compare

Diff two texts with every change highlighted

How to compare two SQL queries

Paste both versions

Add the two queries or scripts — from a migration file, a stored procedure, an ORM log or a schema dump. A live syntax check flags malformed statements.

Format to normalize

Click Beautify: keywords are uppercased and clauses are indented consistently on both sides, so style differences stop polluting the diff.

Compare & review

Run the comparison to see added, removed and edited clauses — a changed column, a new JOIN, a different WHERE condition — highlighted word by word.

Spot the real change between two queries

As with every tool on this site, your SQL never leaves the browser — safe for queries that embed table names, business logic or credentials in connection comments.