Create Database ER Diagrams with AI
Explain your schema—tables, columns, PK/FK relationships, data types—and AI instantly generates a structured Entity-Relationship diagram for database design and documentation.
Try Relational Database Design
AIで図表を即時生成。まずは説明を入力してください。
クイック例：
Current selected: Entity Relationship Diagram
図表タイプを選び、説明文を入力してください
Design Databases in 3 Steps
From conceptual schema to ER diagram
Describe Your Tables
List all tables, columns, primary keys, foreign keys, and relationship rules.
AI Creates ER Diagram
AI generates a normalized schema diagram with crow’s-foot notation and clear table relationships.
Optimize & Implement
Use the ER diagram to check normalization, plan indexes, and guide implementation or migration steps.
登録不要 · 無料 · 今すぐ使用開始
Complete Database Design Suite
Plan, validate, and document your data model
- Normalization Support
- AI helps you identify redundancy and structure your schema according to 1NF, 2NF, and 3NF best practices.
- Cardinality Notation
- Proper one-to-one, one-to-many, and many-to-many relationships using standard crow’s-foot notation.
- Primary & Foreign Keys
- Clear PK/FK markers help you understand how tables connect and enforce referential integrity.
- Data Type Specification
- Document column data types, lengths, precision, and constraints.
Database Design FAQs
- Can I design schemas for any database?
Yes. ER diagrams are compatible with PostgreSQL, MySQL, SQL Server, Oracle, MariaDB, and other relational systems.
- How do I show composite primary keys?
Mention all fields that make up the composite key, and AI will annotate them together.
- Can I add unique or not-null constraints?
Yes. Include constraints in your description and they will be reflected in the diagram.
- How do I represent self-referencing tables?
Describe the relationship and AI will generate a recursive reference visualization.
- Can I include views or stored procedures?
ER diagrams focus on tables, but you can describe views or SP logic and generate separate diagrams.
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