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Oracle 1Z0-007 Exam Syllabus Topics:

Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the data in the EMPLOYEES table.

On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. The JOB_ID column is a NOT NULL column.
Evaluate this DELETE statement:
DELETE employee_id, salary, job_id FROM employees WHERE dept_id = 90;
Why does the DELETE statement fail when you execute it?

A) There is no row with dept_id 90 in the EMPLOYEES table.
B) You cannot delete the EMPLOYEE_ID column because it is the primary key of the table.
C) You cannot delete the JOB_ID column because it is a NOT NULL column.
D) You cannot specify column names in the DELETE clause of the DELETE statement.

2. 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) 46 and 45
C) 46 and 45.93
D) 45 and 45.93
E) 50 and 45.93
F) 50 and 45.9

3. You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".
What happens when the main query is executed?

A) The main query executes with the last value returned by the subquery.
B) You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
C) The main query fails because the multiple-row subquery cannot be used with the comparison operator.
D) The main query executes with the first value returned by the subquery.
E) The main query executes with all the values returned by the subquery.

4. Examine the structure of the EMPLOYEES table:

Which INSERT statement is valid?

A) INSERT INTO employees (employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', '01/01/01');
B) INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', '01 January 01');
C) INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', 01-Jan-01);
D) INSERT INTO employees(employee_id, first_name, last_name, Hire_date) VALUES ( 1000, 'John', 'Smith', To_date('01/01/01'));

5. Examine the data of the EMPLOYEES table.
EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID)

Evaluate this SQL statement:
SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary,
m.employee_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.mgr_id = m.employee_id
AND e.salary > 4000;
What is its output?

A) Option A
B) Option C
C) Option B
D) Option D

Solutions: