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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES table:

You issue these statements:
CREATE table new_emp ( employee_id NUMBER, name VARCHAR2(30));
INSERT INTO new_emp SELECT employee_id , last_name from employees;
Savepoint s1;
UPDATE new_emp set name = UPPER(name);
Savepoint s2;
Delete from new_emp;
Rollback to s2;
Delete from new_emp where employee_id =180;
UPDATE new_emp set name = 'James';
Rollback to s2;
UPDATE new_emp set name = 'James' WHERE employee_id =180;
Rollback;
At the end of this transaction, what is true?

A) You have an employee with the name of James.
B) You cannot roll back to the same savepoint more than once.
C) You have no rows in the table.
D) Your last update fails to update any rows because employee ID 180 was already deleted.

2. Exhibit

The COMMISSION column shows the monthly commission earned by the employee.
Which two tasks would require subqueries or joins in order to be performed in a single step? (Choose two.)

A) listing the employees whose annual commission is more than 6000
B) listing the employees who do not earn commission and who are working for department 20 in descending order of the employee ID
C) finding the number of employees who earn a commission that is higher than the average commission of the company
D) listing the employees who earn the same amount of commission as employee 3
E) listing the departments whose average commission is more that 600
F) finding the total commission earned by the employees in department 10

3. The CUSTOMERS table has these columns:

A promotional sale is being advertised to the customers in France. Which WHERE clause identifies customers that are located in France?

A) WHERE lower(country_address) = 'france'
B) WHERE lower(country_address) = "france"
C) WHERE lower(country_address) = '%france%'
D) WHERE lower(country_address) LIKE %france%
E) WHERE lower(country_address) IS 'france'

4. Evaluate this SQL statement:
SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME
FROM EMP e, DEPARTMENT d
WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;
In the statement, which capabilities of a SELECT statement are performed?

A) Difference, projection, join
B) Difference, projection, product
C) Selection, projection, join
D) Intersection, projection, join
E) Selection, intersection, join

5. Which two statements are true regarding the ORDER BY clause? (Choose two)

A) The sort is in descending order by default.
B) The ORDER BY clause is executed first in the query execution.
C) The sort is in ascending by order by default.
D) The ORDER BY clause is executed on the client side.
E) The ORDER BY clause must precede the WHERE clause.
F) The ORDER BY clause comes last in the SELECT statement.

Solutions: