This topic contains a solution. Click here to go to the answer

Author Question: Deleting tables and relationships is basically a matter of dropping foreign key constraints and then ... (Read 66 times)

evelyn o bentley

  • Hero Member
  • *****
  • Posts: 564
Deleting tables and relationships is basically a matter of dropping foreign key constraints and then dropping the tables.
 
  Indicate whether the statement is true or false

Question 2

Explain the relationships among primary keys and functional dependencies.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

lkanara2

  • Sr. Member
  • ****
  • Posts: 329
Answer to Question 1

TRUE

Answer to Question 2

Relations store instances of functional dependencies in their rows. All primary keys represent a functional dependency, since each primary key functionally determines the entire row. Since the primary key determines the entire row, if a primary key were duplicated in a relation, then the entire row would have to be duplicated. Since a relation can contain no duplicate rows, the primary key must be unique.




evelyn o bentley

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


smrtceo

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Gracias!

 

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

For a complete list of videos, visit our video library