Discussion
For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?
Answer: D
Correct answer: Six
Enforcing a minimum cardinality means constraining what may be done, and there are three actions on each side of the relationship - insert, update and delete on the parent, and the same three on the child - giving six in all. Each must be considered separately when the design is worked out, since a rule that protects one direction may say nothing about the other.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development