CSE1IIT lab 5
Task 1:
A. What is an ER Diagram?
An ER diagram is an entity relation diagram which shows the relation ship between all
entities.
B. What is a primary key?
A primary key is a main identifier for a table that consist of multiple fields.
C. What is a foreign key?
Is column from a table which relates to another column in another table
D. What is a composite primary key?
A composite key is a set of more than one key that, together, uniquely identifies each
record.
E. What is cardinality
Is the number of elements in a set or data base
Task 2:
Read
Task 3:
A) Name/ market price/ numeric ID/ start time/ end time/ target asteroid/ cost of travel.
Mission asteroid ship.
B) Fuel of space ship/ range of ship/ load capacity/
C) Numeric id/
D) S