1. Assignment 4 Map entities with relationships to relational schemas.
Use DBDL to describe the table schemas.

2. E-R Model E1
att1
att2: composite (att21, att22, att23)
att3: multi-value
composite (att31, att32, att33)
Primary Key: att1
DBDL
E1 (att1, att21, att22, att23)
PK: att1
AK: NONE
FK: NONE
NewEntity (NewAtt, att1, att31, att32, att33)
PK: NewAtt
AK: None
FK: att1 References E1

3. E-R Model
E E3
A B1: composite (B11, B12, B13)
A B2
Primary Key: A Primary Key: B1
E2 (0..*) R (1..*) E3
Attribute: D1, D2
DBDL
E2 (A1, A2)
PK: A1
AK: NONE
FK: NONE
E3 (B11, B12, B13, B2)
PK: B11, B12, B13
AK: NONE
FK: NONE
R1(C, A1, B11, B12, B13, D1, D2)
PK: C (new attribute as PK)
AK: NONE
FK: A1 References E2
B11, B12, B13 References E3

4. E-R Model
E E5
A3: composite (A31, A32) B3
A B4: multi-value
Primary Key: A B5
Primary Key: B3
E4 (0..*) R (0..1) E5
DBDL
E4 (A31, A32, A4, B3)
PK: A4
AK: NONE
FK: B3 References E5
E6 (B3, B4, ID)
PK: ID
E5 (B3, B5)
PK: B3
AK: NONE
FK: NONE