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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You need to produce a report for mailing labels for all customers. The mailing label must have only the customer name and address. The CUSTOMERS table has these columns:

Which SELECT statement accomplishes this task?

A) SELECT cust_id, cust_name, cust_address, cust_phone FROM customers;
B) SELECT name, address FROM customers;
C) SELECT id, name, address, phone FROM customers;
D) SELECT cust_name, cust_address FROM customers;
E) SELECT* FROM customers;

2. Examine the data from the EMP table. Evaluate this SQL statement:
SELECT * FROM emp WHERE commission = (SELECT commission FROM emp
WHERE emp_id=3);
What is the result when the query is executed?

A) The query fails because the outer query is retrieving more than one column
B) Exhibit A
C) Exhibit B
D) The query returns no rows
E) The query fails because both the inner and outer queries are retrieving data from the same table.

3. Which two statements about sequences are true? (Choose two)

A) If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.
B) You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.
C) You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
D) You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.
E) You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
F) You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.

4. Which are iSQL*Plus commands? (Choose all that apply.)

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

5. Examine the data from the EMP table:

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

A) Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.
B) Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.
C) Increasing the commission of employee 3 by the average commission earned in department 20.
D) Finding the number of employees who do NOT earn commission and are working for department 20.
E) Deleting the records of employees who do not earn commission.
F) Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.

Solutions: