1. E-R to Relational - Basic
Strong entity
Table with all attributes of that entity
Relationships
Table with primary keys of participating entities
Weak entity
Table with primary key of strong entity
Multi-valued Attribute X
Table with X, primary key of strong entity
Row per value of X
Finally ..

2. E-R to Relational - Improved
For N-1/1-1 relationships
Move relationship attributes to the N-side entity’s table
Dept id moves to employee.
No need for a table for the relationship relating a weak entity
Remove the “depends” table

3. Emp-Dept ER Diagram department car dependent employee Dept id name
Manages
department
city
state
color
Lic#
car
Supervises
Start date
Works for
dependent
supervisee
supervisor
employee
reln
name
Supports
Owns
SSN
Name
address
phones
street
city

4. Emp-Dept schema
Employee(SSN, name, street, city, deptid, startdate, supervisor_ssn)
Dept(deptid, name, city, Manager-SSN)
Phone(SSN, phone#)
Dependent(EMP-SSN, Name, relation)
Car(state, license#, color)
CarOwners(owner-SSN, car-state, license#)