ER Symbols
- ER model stands for an Entity-Relationship model.
- It is a high-level data model.
- The ER model defines the conceptual view of a database.
- It works around real-world entities and the associations among them.
| Symbols | Description |
 | Entity |
 | Weak Entity |
 | Relationship |
 | Identifying Relationship |
 | Attribute |
 | Key Attribute |
 | Multivalued Attribute |
 | Composite Attribute |
 | Derived Attribute |
 | Total participation of E2 in R |
 | Cardinality Ratio 1:N 1E1 entity can be related to NE2 entity |
 | Structural Constraint (Min, Max) on participation of E in R |
 | Optional One |
 | Optional Many |
 | Mandatory One |