Design database schemaseffortlessly
ERD+ is a web-based database modeling tool that lets you quickly and easily create Entity Relationship Diagrams and Relational Schemas.
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See ERD+ in Action
Explore the powerful features that make database modeling simple and efficient
Create ERDs Effortlessly
Design complex entity relationships with our intuitive drag-and-drop interface
Generate Relational Schemas
Automatically convert your ERDs into clean relational database schemas
Export to SQL
Generate ready-to-use SQL scripts directly from your diagrams
Export as Images
Save your diagrams as high-quality PNG images for documentation
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Powerful Features
Everything you need for professional database modeling, completely free
Database Modeling
Create Entity Relationship Diagrams (ERDs) and Relational Schemas with our powerful web-based tool.
Auto-Conversion
Automatically convert your ER Diagrams into Relational Schemas with a single click.
SQL Export
Generate SQL scripts directly from your diagrams for immediate database implementation.
PNG Export
Export your diagrams as high-quality PNG images for presentations and documentation.
Cloud Storage
Save your diagrams safely on our servers and access them from anywhere, anytime.
Quick & Easy
Intuitive interface that lets you create professional diagrams in minutes, not hours.
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Entity Relationship Diagrams (ERDs)
ERD+ enables drawing standard ERD components with comprehensive support for all database modeling concepts.
Supported Components:
- Entities (regular and weak entities)
- Attributes (regular, unique, multi-valued, derived, composite, and optional)
- Relationships with all possible cardinality constraints
Advanced Notation: The notation supports drawing regular and weak entities, various types of attributes, and all possible cardinality constraints of relationships (mandatory-many, optional-many, mandatory-one and optional-one).
Relational Schemas
ERD+ enables drawing standard Relational Schema components with intuitive tools for creating database table structures.
Schema Components:
- Tables (Relations)
- Table Columns (including Primary and Foreign Keys)
- Referential Integrity Constraint Lines
Quick Creation: The tool supports quick creation of foreign keys and referential integrity lines by simple click-point-connect actions. This simplifies and quickens the process of creating relational schemas.
Star Schemas (Dimensional Models)
ERD+ enables drawing Star Schema components for data warehouse and business intelligence modeling.
Star Schema Components:
- Fact Tables (Facts) - with thicker frame notation
- Dimension Tables (Dimensions)
- Foreign key relationships between facts and dimensions
Visual Distinction: The notation distinguishes fact tables from dimension tables by using a thicker frame around fact tables. This makes star schema diagrams easier to interpret and understand.
Automatically Convert ER Diagrams to Relational Schemas
ERD+ enables automatic conversion of ER Diagrams to Relational Schemas with one click of a button. This vastly speeds up the process of creating a Relational Schema based on an ER Diagram.
How to Use This Feature:
Log into your account
Access your ERD+ dashboard with your credentials
Select Convert Option
Click on the drop menu next to the name of any ER Diagram and choose "Convert to Relational Schema" option
Get Your Schema
This will create a diagram containing the converted Relational Schema
Export Standard SQL
Generate SQL from Relational Schemas and Star Schemas. Select from common data types and data sizes.
Database Compatibility
Works with most contemporary RDBMS tools including:
Complete DDL Generation: The exported SQL includes CREATE TABLE statements with proper data types, primary keys, foreign keys, and referential integrity constraints.
More Features That Make ERD+ Special
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Ready to Start Modeling?
Join thousands of developers and database designers who use ERD+ for their database modeling needs. It's completely free!