Paste code in both panels or click Load Example to see a SQL diff in action.
Source SQL
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Modified SQL
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SQL Diff Tool
Compare SQL scripts and database schemas online using our SQL diff checker and highlight differences line by line. Easily review changes in queries, tables, views, or stored procedures between SQL versions.
About the SQL Diff Checker
Manual code reviews can be tedious and prone to human error. A single missing character or indentation error in SQL can break an entire application. That is why using a dedicated diff checker is essential for modern development.
Diff Guru's SQL Code Compare tool is engineered to help you diff code accurately. Unlike standard text comparison tools, our engine understands SQL syntax. It visualizes structure, keywords, and logic changes with distinct colors, allowing you to compare code files confidently and merge changes without conflicts.
How to Compare SQL Code
1
Paste SQL Code
Copy your original code snippet into the left panel and your modified version into the right panel to prepare for the code compare.
2
Run Diff Checker
Click the "Compare SQL" button. Our engine will instantly diff code to identify additions, deletions, and modifications.
3
Analyze & Merge
Review the syntax-highlighted changes. Use the merge tool to combine the best parts of both versions into one final file.
Supported Formats & Languages
Diff Guru supports a vast array of formats. Select a specific tool below for optimized syntax highlighting and comparison.
Programming
Data & Config
Why Choose This SQL Diff Tool?
Syntax Awareness
We don't just diff text; we diff code. Enjoy native SQL coloring for better readability.
Secure Client-Side Processing
When you compare code here, it stays on your machine. We strictly adhere to privacy, so your proprietary logic is safe.
Instant Performance
No upload times. Our diff checker runs in your browser memory for immediate feedback.
Built-in SQL Formatter
Before you diff, click Format SQL to beautify both panels - capitalizing keywords, adding proper indentation, and normalizing whitespace. This eliminates formatting noise so your diff shows only real logic changes.
Try it Instantly with a Live Example
Not sure where to start? Click Load Example above the editor to pre-fill both panels with a real SQL code diff - and see syntax highlighting and change detection working immediately without pasting any code.
Frequently Asked Questions
Yes, Diff Guru is a completely free diff checker. You can compare SQL code files as often as you like without any hidden costs or subscription fees.
Absolutely. We use client-side processing, which means your code never leaves your browser. It is not uploaded to our servers, making this the most secure way to diff code online.
Yes! Unlike basic text comparison tools, our tool recognizes SQL syntax. It highlights keywords, comments, strings, and operators to make reading the code diff much easier.
Yes. When you compare code and find differences, you can use the merge arrows to move code from the original file to the changed file, allowing you to construct a final version easily.
Yes. This is one of the most popular use cases. Paste your old and new CREATE TABLE, ALTER TABLE, or migration scripts into the two panels to instantly see which columns, indexes, constraints, or data types changed.
The Format SQL button beautifies messy or minified SQL - adding proper indentation, capitalized keywords, and consistent line breaks - before you run the comparison. This makes diffs far easier to read because formatting differences are eliminated.
Yes. The syntax highlighter recognizes standard SQL keywords used across all major dialects including PostgreSQL, MySQL, MariaDB, SQL Server (T-SQL), SQLite, and Oracle. Dialect-specific functions and keywords are highlighted correctly.
Absolutely. Paste your old and new stored procedure (CREATE PROCEDURE), view (CREATE VIEW), or trigger definitions into the panels. The diff will show exactly which lines of the procedure logic changed between versions.