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"Chen's notation for entity–relationship modeling uses rectangles to represent entity sets, and diamonds to represent relationships appropriate for first-class objects: they can have attributes and relationships of their own. If an entity set participates in a relationship set, they are connected with a line.
Attributes are drawn as ovals and are connected with a line to exactly one entity or relationship set.
Cardinality constraints are expressed as follows:
- a double line indicates a participation constraint, totality or surjectivity: all entities in the entity set must participate in at least one relationship in the relationship set;
- an arrow from entity set to relationship set indicates a key constraint, i.e. injectivity: each entity of the entity set can participate in at most one relationship in the relationship set;
- a thick line indicates both, i.e. bijectivity: each entity in the entity set is involved in exactly one relationship.
- an underlined name of an attribute indicates that it is a key: two different entities or relationships with this attribute always have different values for this attribute.
Attributes are often omitted as they can clutter up a diagram; other diagram techniques often list entity attributes within the rectangles drawn for entity sets." [Entity–relationship model. Wikipedia]
The vector stencils library ERD, Chen's notation contains 13 symbols for drawing entity-relatinship diagrams using the ConceptDraw PRO diagramming and vector drawing software.
The example "Design elements - ER diagram (Chen notation)" is included in the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Chen's ERD
Chen's ERD, week key attribute, weak entity, relationship, multivalue attribute, key attribute, identifying relationship, entity, derived attribute, attribute, associative entity,
Used Solutions
The vector stencils library "ERD, Chen's notation" contains 13 ERD elements.
Use it for drawing ER-diagrams using Chen's notation in the ConceptDraw PRO diagramming and vector drawing software extended with the Entity-Relationship Diagram (ERD) solution from the Software Development area of ConceptDraw Solution Park.
Entity
Entity, entity,
Weak entity
Weak entity, weak entity,
Relationship
Relationship, relationship,
Identifying Relationship
Identifying Relationship, identifying relationship,
Associative Entity
Associative Entity, associative entity,
Participation
Participation,
Optional participation
Optional participation,
Recursive Relationship
Recursive Relationship,
Attribute
Attribute, attribute,
Key attribute
Key attribute, key attribute,
Weak key attribute
Weak key attribute, weak key attribute,
Derived attribute
Derived attribute, derived attribute,
Multivalue attribute
Multivalue attribute, multivalue attribute,
Used Solutions
The vector stencils library "AWS Database" contains 30 Amazon Web Services database icons: Amazon DynamoDB symbols, Amazon Relational Database Service symbols, Amazon ElasticCache symbols, Amazon SimpleDB symbols, Amazon Redshift symbols.
Use it to draw AWS architecture diagrams of your cloud service.
The symbols example "AWS Database - Vector stencils library" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the AWS Architecture Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park.
DynamoDB
DynamoDB, DynamoDB,
Table
Table, table,
Item
Item, item,
Items
Items, items,
Attribute
Attribute, attribute,
Attributes
Attributes, attributes,
Global secondary index
Global secondary index, global secondary index,
Amazon RDS
Amazon RDS, Amazon RDS,
RDS DB instance
RDS DB instance, RDS DB instance,
RDS DB instance standby (Multi-AZ)
RDS DB instance standby (Multi-AZ), RDS DB instance standby, Multi-AZ,
RDS DB instance read replica
RDS DB instance read replica, RDS DB instance read replica,
MySQL DB instance
MySQL DB instance, MySQL DB instance,
Oracle DB instance
Oracle DB instance, Oracle DB instance,
MS SQL instance
MS SQL instance, MS SQL instance,
PostgreSQL instance
PostgreSQL instance, PostgreSQL instance,
SQL master
SQL master, SQL master,
SQL slave
SQL slave, SQL slave,
PIOP
PIOP, PIOP,
ElastiCache
ElastiCache, ElastiCache,
Cache node
Cache node, cache node,
Redis
Redis, Redis,
Memcached
Memcached, Memcached,
Amazon SimpleDB
Amazon SimpleDB, Amazon SimpleDB,
Domain
Domain, domain,
Amazon Redshift
Amazon Redshift, Amazon Redshift,
Solid state disks
Solid state disks, solid state disks,
DW2 Dense Compute
DW2 Dense Compute, DW2 Dense Compute,
DW1 Dense Compute
DW1 Dense Compute, DW1 Dense Compute,
Used Solutions

ERD, entity-relationship diagram, ER-diagram, Chen Notation Chen Notation

ERD, entity-relationship diagram, ER-diagram, Chen Notation
The Chen Notation solution extends ConceptDraw PRO v10 software with rich collection of ERD samples and selection of special Chen's notation icons for effective database design, data modeling, and visual representation of relationships between the entities on the ER diagrams designed with Chen notation.