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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. SELECT *
From orders;
You use this statement to retrieve data from a data table for __________. (Choose all that apply)

A) Truncating
B) Updating
C) Viewing
D) Inserting
E) Deleting

2. Which two statements accurately describe a role? (Choose two.)

A) Privileges are given to a role by using the CREATE ROLE statement.
B) A role is a named group of related privileges that can be granted to the user.
C) A role can have a maximum of 100 privileges contained in it.
D) A user can have access to a maximum of 10 roles.
E) A role can be given to a maximum of 1000 users.
F) A user can have access to several roles, and several users can be assigned the same role.

3. Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id);
Which statement is true?

A) The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.
B) The SELECT statement does not work because the GROUP BY clause should be in the
main query and not in the subquery.
C) The SELECT statement is syntactically accurate.
D) The SELECT statement does not work because there is no HAVING clause.

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

A) A subquery can retrieve zero or more rows.
B) A subquery can be used only in SQL query statements.
C) A subquery CANNOT be used in an SQL query statement that uses group functions.
D) Subqueries CANNOT be nested by more than two levels.
E) 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.
F) A subquery should retrieve only one row.

5. Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?

A) The second statement returns a syntax error.
B) The two statements produce identical results.
C) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
D) There is no need to specify DESC because the results are sorted in descending order by default.

Solutions: