Supported ER Concepts

The table below provides an overview of the supported ER concepts in bigER.

✅ - Supported
⏺ - Partly supported
❌ - Not supported

ER Concept	Textual	Graphical	Generator	Additional information
Entities
Strong Entity	✅	✅	✅
Weak Entity	✅	✅	❌
Relationships
Binary Relationship	✅	✅	✅	A -> B
Unary Relationship	✅	✅	✅	A -> A
Ternary Relationship	✅	✅	✅	A -> B -> C
N-ary Relationship	❌	❌	❌	up to ternary (3-ary) supported
Cardinality Constraints	✅	✅	❌	1 (one) or N (many) e.g. A[1] -> B[N] (one-to-many)
Participation Constraints	✅	✅	❌	0 (zero/optional) or 1 (one/mandatory) e.g. A[0..1] (zero-or-one)
Roles	✅	✅	❌	A[ N | "role" ]
Attributes
Entity Attributes	✅	✅	✅
Relationship Attributes	✅	⏺	✅	visible only on hover (diagram)
Keys	✅	✅	✅	attr key (primary key) attr partial-key (for weak entities)
Datatypes	✅	✅	✅	attr1: INTEGER or attr2: VARCHAR(50)
Composite Attribute	❌	❌	❌
Multi-valued Attribute	✅	✅	❌	attr multi-valued
Derived Attribute	✅	✅	✅	attr derived
EER Concepts
Generalization	✅	✅	❌	A extends B

For more information on how to use the concepts, see the Language Documentation.