« previous next »

Author Question: For the M-O (parent mandatory, child optional) case, what action(s) should be taken to ensure ... (Read 57 times)

JGIBBSON

  • Hero Member
  • *****
  • Posts: 538
on: Jul 7, 2018
For the M-O (parent mandatory, child optional) case, what action(s) should be taken to ensure minimum cardinality is maintained?
 
  A) Define referential integrity constraint from child to parent
  B) Make foreign key NOT NULL
  C) Will require trigger or other application code
  D) Both A and B are correct

Question 2

The data model produced by reverse engineering is a(n) ________.
 
  A) conceptual schema
  B) internal schema
  C) dependency graph
  D) table-relationship diagram


Jossy

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 7, 2018
Answer to Question 1

D

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Primary Action of Epinephrine in a Liver Cell Primary Action of Epinephrine in a Liver Cell
Mechanism of Action of Lipid-Lowering Drugs Mechanism of Action of Lipid-Lowering Drugs
Mechanism of Action of Immunosuppressants Mechanism of Action of Immunosuppressants
Synaptic transmission. (a) Action potential reaches synapse; (b) neurotransmitter released synaptic ... Synaptic transmission. (a) Action potential reaches synapse; (b) neurotransmitter released synaptic ...
Stomata in action Stomata in action
Current intensity and the frequency of action potentials Current intensity and the frequency of action potentials
Video: New DNA Strand Replication

For a complete list of videos, visit our video library