Question 1:
Suppose that our database has the following table.
Person
Con
Con
Con
Con
State
State
State
State
State
Cty
Cty
Cty
Per
Per
Per
Per
Per
ID
Name
Pop
Size
code
Name
Rgn
Size
Pop
Code
Name
Size
SSN
Name
Age
DofB
Add
Field Explanation:
Con: Stands for Country
Pop: Stands for population
Rgn: Stands for region (like west, east, central, etc.)
Cty: Stands for City
Per: Stands for Person
DofB: Stands for date of birth
Add: Stands for Address
It is assumed that
Every country in the world has a different country ID
Every city in the world has a different city code
Every state in the world has a different state code, and
Every person in the world has a different SSN
Every person in the world has only one citizenship and has only one address
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Other Assumptions:
There is no village, county, area, etc. A country consists of several states and each state has several cities
Based on the above assumptions, what do you choose to be the primary key of Person table? Why?
Explain the anomalies exist in the Person table. Choose only one example of insert anomaly, one example of delete anomaly and one example of update anomaly. Note that update does not mean adding or deleting records. It only refers to modifications of values in some rows of the table.
Normalize the table; create as many as tables necessary such that all new tables are in third normal form. All the transitive and derived dependencies must be removed..
Draw your ERD based on fully normalized table (Reverse Engineering).
