SQL CHECK Constraint Generator

Paste a CREATE TABLE statement and get intelligent CHECK constraints tailored to your column names and types. Supports PostgreSQL, MySQL, SQLite, SQL Server, and Oracle.

👤 Users Table 📦 Products Table 🛒 Orders Table 📅 Events Table

📝 Input CREATE TABLE

🔒 Generated CHECK Constraints

Click "Generate Constraints" to see results...

📋 Detected Patterns

No patterns detected yet.

💡 How It Works

This tool analyzes your column names and data types to suggest CHECK constraints that enforce data integrity at the database level. It recognizes 20+ common patterns including emails, URLs, prices, ages, statuses, coordinates, and more. Each suggestion shows which SQL dialects support it — some constraints use dialect-specific syntax (e.g., regex in PostgreSQL vs LIKE in MySQL).

Note: CHECK constraints are enforced by the database engine. They prevent bad data from entering your tables, but they do not validate existing data unless you add NOT VALID (PostgreSQL) or run a manual cleanup. Always test constraints in a non-production environment first.