ER Diagram Tool

This tool provides a structured workspace to capture entities, attributes, keys, and relationships for database design. It supports common ERD notations, cardinalities, and weak entities, and can generate SQL Data Definition Language (DDL) statements for major dialects. The core logic translates a modeled schema into a readable diagram and a production-ready schema snippet. Users input entities with attributes, assign primary and foreign keys, and define relationships with cardinalities. The layout engine arranges elements for readability, while validation checks enforce referential integrity and key presence. The tool can also import or parse SQL to create an equivalent diagram, aiding reverse engineering. Outputs include scalable SVG diagrams for documentation, PNG/PDF exports for reporting, and SQL DDL tailored to PostgreSQL, MySQL, or SQL Server. This combination reduces design iteration time, improves consistency across teams, and provides a shareable artifact for stakeholders. Not a database engine, but a modeling and documentation aid with non-destructive editing and export capabilities. Use cases include initial schema design, updating existing models, documenting data flows, and aligning engineering with governance requirements.