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MCQs

Total Questions : 64 | Page 7 of 7 pages
Question 61. . What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?
  1.    ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);
  2.    ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);
  3.    ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
  4.    None of the above is correct.
 Discuss Question
Answer: Option C. -> ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
Question 62. . A tool that can help designers understand the dependencies of database structures is a:
  1.    dependency graph.
  2.    data model.
  3.    graphical display.
  4.    None of the above is correct.
 Discuss Question
Answer: Option A. -> dependency graph.
Question 63. . How many copies of the database schema are typically used in the redesign process?
  1.    One
  2.    Two
  3.    Three
  4.    Four
 Discuss Question
Answer: Option C. -> Three
Question 64. . Because of the importance of making data model changes correctly, many professionals are ________ about using an automated process for database redesign.
  1.    optimistic
  2.    skeptical
  3.    ambivalent
  4.    None of the above is correct.
 Discuss Question
Answer: Option B. -> skeptical

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