Erd Notation
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ERD Notation Basic Notation Meaning
Old Style
New Style
E
Entity
A
Relationship
E
B
R
A
B
R
p2 p1
p3
E
Attributes
composite key
derived simple
simple [derived]
E
mulit-valued
(p1, p2, p3) {multi-valued}
Weak Entity
E
E
Identifying Relationship Type A
R
B
A
R
B
Associative Entity
A
R
B
A
1
R
B
Cardinality and Participation Constraints Meaning
Old Style
New Style
1:1
1:M
M:M
Mandatory 1:1
Mandatory 1:M or
Optional 1:M
Mandatory M:M or
2
Old Style
New Style
E
Entity
A
Relationship
E
B
R
A
B
R
p2 p1
p3
E
Attributes
composite key
derived simple
simple [derived]
E
mulit-valued
(p1, p2, p3) {multi-valued}
Weak Entity
E
E
Identifying Relationship Type A
R
B
A
R
B
Associative Entity
A
R
B
A
1
R
B
Cardinality and Participation Constraints Meaning
Old Style
New Style
1:1
1:M
M:M
Mandatory 1:1
Mandatory 1:M or
Optional 1:M
Mandatory M:M or
2
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