About SQL Diff Checker
Paste two SQL scripts and instantly see every difference highlighted side by side. Line-level and character-level diff with SQL syntax highlighting — keywords, strings, numbers, and comments all coloured. Works with MySQL, PostgreSQL, SQLite and more.
Frequently Asked Questions
What is a SQL diff tool?
A SQL diff tool compares two SQL scripts and highlights every line-level difference — added lines in green, removed lines in red. It is useful for reviewing migration script changes, comparing stored procedure versions, and auditing schema alterations.
How do I compare two SQL migration scripts to find what changed?
Paste the old migration into the left panel and the new migration into the right. The diff highlights new table definitions, altered column types, added indexes, and changed constraints. This is essential before applying a migration to a shared database to verify there are no unintended changes.
Can a SQL diff tool compare stored procedures and views?
Yes. Paste the CREATE PROCEDURE or CREATE VIEW statements for both versions. The diff highlights changed parameter names, return types, WHERE clause modifications, and JOIN changes. For large stored procedures, use word diff mode to focus on the specific logic lines that changed.
What is the difference between a SQL schema diff and a data diff?
A schema diff compares DDL — table structure, column definitions, indexes, and constraints. A data diff compares DML results — the actual rows in tables. This tool does schema/query text diffing. For data diffs (comparing query result sets), use database-specific tools like pgdiff for PostgreSQL or data comparison features in DBeaver.
Is my SQL code sent to a server when using this online diff tool?
No. All comparison runs in your browser. Your SQL queries, schema definitions, and stored procedure code are never transmitted anywhere. This is safe for proprietary query logic, internal schema definitions, and SQL containing table or column names from sensitive databases.
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