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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which /SQL*Plus feature can be used to replace values in the WHERE clause?

A) Replacement variables
B) Substitution variables
C) Prompt variables
D) This feature cannot be implemented through /SQL*Plus.
E) Instead-of variables

2. Which two statements about subqueries are true? (Choose two.)

A) When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
B) A subquery should retrieve only one row.
C) Subqueries CANNOT be nested by more than two levels.
D) A subquery can be used only in SQL query statements.
E) A subquery CANNOT be used in an SQL query statement that uses group functions.
F) A subquery can retrieve zero or more rows.

3. Examine these statements:
CREATE ROLE registrar;
GRANT UPDATE ON student_grades TO registrar;
GRANT registrar to user1, user2, user3;
What does this set of SQL statements do?

A) It creates a role called STUDENT_GRADES, adds the UPDATE privilege on three users, and gives the UPDATE role to the registrar.
B) It creates a role called REGISTRAR, adds the UPDATE privilege on three users, and gives the REGISTRAR role to the STUDENT_GRADES object.
C) It creates a role called REGISTRAR, adds the MODIFY privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.
D) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and creates three users with the role.
E) The set of statements contains an error and does not work.
F) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.

4. Which clause would you use in a SELECT statement to limit the display to those employees whose salary is greater then 5000?

A) GROUP BY SALARY > 5000
B) WHERE SALARY > 5000
C) HAVING SALARY > 5000
D) ORDER BY SALARY > 5000

5. Examine the structures of the EMPLOYEES and TAX tables.

You need to find the percentage tax applicable for each employee. Which SQL statement would you use?

A) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min_salary AND t.max_salary;
B) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary
C) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent
D) You cannot find the information because there is no common column between the two tables.

Solutions: