Which is the primary key(s) in the following ...

[serike]

Which is the primary key(s) in the following STUDENT_GRADE(StudentID, CourseID, Grade)?
 
  A) STUDENT_GRADE
  B) StudentID
  C) CourseID
  D) StudentID, CourseID
  E) Grade

Question 2

Which of the following is an example of a horizontal-market application software?
 
  A) a software developed by the IRS for its own needs
  B) ArtRage, the iPad application
  C) AutoCad
  D) Microsoft Excel

Question 3

CPU speed is expressed in cycles called ________.
 
  A) hertz
  B) bytes
  C) bits
  D) pixels

[l.stuut]

Answer to Question 1

D
Explanation: D) The relation STUDENT_GRADE has a composite primary key.
CL

Answer to Question 2

Posted another one can you check that one too? Thanks.

Answer to Question 3

A

[serike]

Great answer, keep it coming

[parshano]

Excellent