16. DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

A. True
B. False

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17. The result of every SQL query is a table.

A. True
B. False

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18. COUNT(field_name) tallies only those rows that contain a value; it ignores all null values.

A. True
B. False

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19. SUM, AVG, MIN, and MAX can only be used with numeric columns.

A. True
B. False

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20. Most companies keep at least two versions of any database they are using.

A. True
B. False

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