How does the SQL to ER Diagram generator work?

It scans raw SQL DDL scripts for 'CREATE TABLE' statements, extracts columns, data types, PRIMARY KEY constraints, and FOREIGN KEY ... REFERENCES constraints, and dynamically builds an interactive visual schema layout.

Is my database schema uploaded to any external server?

No. The parsing engine and visual canvas run entirely locally inside your browser using client-side JavaScript. None of your DDL scripts or schema configurations are ever stored or uploaded.

Can I rearrange the generated table cards?

Yes! The canvas is fully interactive. You can drag and drop any table card to reposition it, and the SVG connector overlay will automatically update relation paths in real-time.

Interactive ER Diagram Generator

Paste SQL CREATE TABLE schemas, drag tables around, and visualize your database relations instantly.

SQL DDL Input

Interactive Schema Diagram

Visualizing Database Schemas with ER Diagrams

An Entity-Relationship Diagram (ERD) is a vital blueprint for any database engineering project. It represents the structural relationship between different tables, including one-to-one, one-to-many, and many-to-many associations.

Creating ER diagrams manually can be tedious. By pasting your DDL (Data Definition Language) CREATE TABLE statements directly into this tool, you can visualize your entire schema design in seconds. This is invaluable during design phases, code reviews, and for documentation.

Normalization Best Practice:When defining foreign key relations, ensure the referenced columns are primary keys or unique columns on the target table. This enforces referential integrity and optimizes join performance in query execution plans.

Frequently Asked Questions

What SQL syntax dialects are supported?

The parser supports standard ANSI SQL, which covers PostgreSQL, MySQL, SQLite, Oracle, and Microsoft SQL Server. It identifies standard constraint rules such as PRIMARY KEY and FOREIGN KEY REFERENCES inline or as separate table constraints.

Can I export the visual diagram?

Yes, you can export the schema structure, copy DDL updates, or take screenshots of the interactive canvas to use in your documentation, wikis, or project specifications.

Related Resources

JSON to SQL Converter•CSV to SQL Converter•Mock Data Generator•Database Design Academy

Official Reference Wiki:Wikipedia: Entity-Relationship Model