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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Evaluate the SQL statement:
SELECT ROUND(45.953, -1), TRUNC(45.936, 2)
FROM dual;
Which values are displayed?

A) 45.95 and 45.93
B) 50 and 45.9
C) 50 and 45.93
D) 46 and 45.93
E) 46 and 45
F) 45 and 45.93

2. You need to write a SQL statement that returns employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
Which statement accomplishes this task?

A) SELECT emp_name, sal, dept_id, maxsal FROM employees, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) WHERE a.sal < maxsal;
B) SELECT a.emp_name, a.sal, b.dept_id, MAX(sal) FROM employees a, departments b WHERE a.dept_id = b.dept_id AND a.sal < MAX(sal) GROUP BY b.dept_id;
C) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) b WHERE a.dept_id = b.dept_id AND a.sal < b.maxsal;
D) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a WHERE a.sal < (SELECT MAX(sal) maxsal FROM employees b GROUP BY dept_id);

3. 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 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) A subquery can retrieve zero or more rows.
F) A subquery should retrieve only one row.

4. Examine the description of the EMPLOYEES table:

Which statement shows the department ID, minimum salary, and maximum salary paid in that department, only of the minimum salary is less then 5000 and the maximum salary is more than 15000?

A) SELECT dept_id, MIN(salary), MAX(salary)
FROM employees
GROUP BY dept_id
HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;
B) SELECT dept_id, MIN(salary), MAX(salary)
FROM employees
HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;
C) SELECT dept_id, MIN(salary), MAX(salary)
FROM employees
WHERE MIN(salary) < 5000 AND MAX(salary) > 15000
GROUP BY dept_id;
D) SELECT dept_id, MIN(salary(, MAX(salary)
FROM employees
WHERE MIN(salary) < 5000 AND MAX(salary) > 15000;
E) SELECT dept_id, MIN(salary), MAX(salary)
FROM employees
GROUP BY dept_id, salary
HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;

5. Which view should a user query to display the columns associated with the constraints on a table owned by the user?

A) USER_CONSTRAINTS
B) USER_COLUMNS
C) USER_CONS_COLUMNS
D) ALL_CONSTRAINTS
E) USER_OBJECTS

Solutions: