🗃️ SQL Migration Generator

What Can the SQL Migration Generator Do?

The SQL Migration Generator is a free online tool that helps developers quickly generate database migration SQL scripts through a visual interface. It supports creating/dropping tables, adding/modifying/dropping columns, creating indexes, and data migration, with automatic rollback SQL generation. All processing is done locally in your browser.

Core Features

• Create Table: Visually define table name, columns, data types, and constraints to generate CREATE TABLE statements
• Alter Table: Add/modify/drop columns, rename tables, generate ALTER TABLE statements
• Index Management: Create regular and unique indexes with specified columns and sort order
• Data Migration: Generate INSERT INTO...SELECT statements with column mapping and WHERE filtering
• Auto Rollback: Each migration operation automatically generates corresponding Down rollback SQL

How to Use

1. Select database type (MySQL/PostgreSQL/SQLite/SQL Server)

2. Enter migration version and description

3. Choose operation type: Create Table / Alter Table / Index / Data Migration

4. Configure table structure, column definitions, indexes, etc.

5. Click "Generate SQL" to preview Up and Down scripts

6. Copy or download the SQL file and execute in your database

Use Cases

Case 1: New Project Initialization

Quickly generate initial database table structure with timestamps and soft delete fields when starting a new project.

Case 2: Iterative Development

Generate incremental migration scripts for each feature iteration, managing database changes with version control.

Case 3: Database Refactoring

Generate ALTER TABLE statements for schema changes with automatic rollback scripts for safety.

Case 4: Data Migration

Migrate data from old tables to new tables during system upgrades with column mapping and filtering.

Technical Background

Database Migration is a standardized method for managing database schema changes. Mainstream frameworks like Rails ActiveRecord Migrations, Django Migrations, Flyway, and Liquibase all use migration scripts to manage database versions. Migration scripts are divided into Up (apply changes) and Down (rollback changes) parts, ensuring each change is traceable and reversible. Best practices: each migration should do one thing only; migration scripts should never be modified after commit; wrap migrations in transactions; validate in test environments before running in production.