This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: What are MUST NOT and MUST COVER constraints? What will be an ideal ... (Read 91 times)

evelyn o bentley

  • Hero Member
  • *****
  • Posts: 564
on: Jul 7, 2018
What are MUST NOT and MUST COVER constraints?
 
  What will be an ideal response?

Question 2

The SQL DELETE TABLE statement can be used to remove unneeded tables after the normalized tables are created and populated.
 
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

strudel15

  • Sr. Member
  • ****
  • Posts: 324
Reply #1 on: Jul 7, 2018
Answer to Question 1

Both MUST NOT and MUST COVER constraints occur when working with three tables in a ternary relationship. When a MUST NOT constraint occurs, it indicates that one binary relationship of two of the tables contains combinations of values that are not allowed to occur in the ternary relationship. When a MUST COVER constraint occurs, it indicates that one binary relationship of two of the tables contains combinations of values that must all appear in the ternary relationship.

Answer to Question 2

FALSE


evelyn o bentley

  • Member
  • Posts: 564
Reply 2 on: Jul 7, 2018
Excellent

xthemafja

  • Member
  • Posts: 348
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Disposable plastic cover placed over probe Disposable plastic cover placed over probe
A binder clip keeps a fender cover from falling off. A binder clip keeps a fender cover from falling off.
With all vacuum lines and the intake tube removed, the valve cover can be removed after removing all ... With all vacuum lines and the intake tube removed, the valve cover can be removed after removing all ...
The chart under the cover for the relay center indicates the location of the relay that controls ... The chart under the cover for the relay center indicates the location of the relay that controls ...
Apply the substance to the arm with long, smooth strokes, then cover the arm and abdomen with the ... Apply the substance to the arm with long, smooth strokes, then cover the arm and abdomen with the ...
For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately
Video: Lipid catabolism ( ketogenesis and oxidation of glycerol) and Lipid anabolism (lipogenesis)

For a complete list of videos, visit our video library