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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which statement correctly describes SQL and /SQL*Plus?

A) SQL manipulates data and table definitions in the database; /SQL*Plus does not allow manipulation of values in the database.
B) /SQL*Plus recognizes SQL statements and sends them to the server; SQL is the Oracle proprietary interface for executing SQL statements.
C) Both SQL and /SQL*plus allow manipulation of values in the database.
D) /SQL*Plus is a language for communicating with the Oracle server to access data; SQL recognizes SQL statements and sends them to the server.

2. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:

Which DELETE statement is valid?

A) DELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);
B) DELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_employees);
C) DELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE last_name = 'Carrey');
D) DELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'Carrey');

3. Examine the structure of the EMPLOYEES and DEPARTMENTS tables:

You want to create a report displaying employee last names, department names, and locations. Which query should you use to create an equi-join?

A) SELECT last_name, department_name, location_id
FROM employees , departments ;
B) SELECT e.last_name, d.department_name, d.location_id
FROM employees e, departments D
WHERE e.department_id =d.department_id;
C) SELECT e.last_name, d.department_name, d.location_id
FROM employees e, departments D
WHERE manager_id =manager_id;
D) SELECT employees.last_name, departments.department_name,
departments.location_id
FROM employees e, departments D
WHERE e.department_id =d.department_id;

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

5. Which are /SQL*Plus commands? (Choose all that apply.)

A) RENAME
B) INSERT
C) DELETE
D) DESCRIBE
E) SELECT
F) UPDATE

Solutions: