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Relational Constructs Database Table - Quiz

Each question is worth one point. Select the best answer or answers for each question.
 
1. A table field that is a primary-key field in another table is referred to as what kind of key?
Please select the best answer.
  A. Concatenated primary key
  B. Foreign key
  C. Candidate key
  D. Primary key

2. Which of the following data domains support calculations?
Please select all the correct answers.
  A. VARCHAR
  B. BOOLEAN
  C. INT
  D. DATE

3. A descriptor column contains what type of data?
Please select the best answer.
  A A description of the table as a whole
  B. A candidate key
  C. A non-key attribute of an entity
  D. A link to another table

4. If you knew a company had a fax number but didn't have it on hand, what type of value would you use as a placeholder in that table column?
Please select the best answer.
  A. A zero
  B. A blank
  C. A null
  D. A single letter