Data Base week3_1

1. Problem solving - practical job
2. Understanding consolidating - practical exam

Exam

1. close book
2. open book (use anything ex. internet)

Flat Table Problem

1. repetition
2. Anomalies (Data integrity)

1. update: many times
   
2. insert: need all information or some information NULL
   
3. delete: vital information lost

column : class
row :　attribute
cell : object
table : entity