5. In the Relational Data Model, the NULL value corresponds to?

a) unknown value. b) missing value c) empty (space)

d) 0 (zero) value e) (a) and (b) f) (a), (b) and (c)

g) (a), (b), (c) and (d)

6. Which one of the following is not a property of Transactions?

a) Atomic b) Consistency c) Backup d) Isolation e) Durability

7. Which one of the following should be specified in the statement if an SQL SELECT statement contains a HAVING clause?

a) ORDER BY b) LIKE c) ORDER BY ASC d) GROUP BY e) WHERE

8. The IN operator is used to compare a single value with a set in an SQL WHERE Clause. It is equivalent to which one of the following operators?

a) = b) EXISTS c) > ANY d) = ANY e) none of the above.

9. In order for the LIKE operator to match exactly one character, which one of the following symbols should be used?

a) * b) _ c) % d) & e) |

10. What happens if we dont specify the WHERE clause in an SQL DELETE FROM statement?

a) statement compilation causes a Syntax error, and the statement is not executed.

b) all the tuples of the relaton are deleted.

c) none of the tuples of the relation is deleted.

d) all the tuples not satisfying the condition are deleted.

e) none of the above.

11. Which one(s) of the following is(are) procedural?

a) Relational Algebra b) Relational Calculus c) Tuple Relational Calculus

d) Domain Relational Calculus e) SQL f) (a) and (e)

e) (b) and (e).