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

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

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

4. Which SELECT statement should you use to extract the year from the system date and display it in the format "1998"?

A) SELECT TO_CHAR(SYSDATE,'yyyy') FROM dual;
B) SELECT DECODE(SUBSTR(SYSDATE, 8), 'YYYY') FROM dual;
C) SELECT DECODE(SUBSTR(SYSDATE, 8), 'year') FROM dual;
D) SELECT TO_CHAR(SUBSTR(SYSDATE, 8,2),'yyyy') FROM dual;
E) SELECT TO_DATE(SYSDATE,'yyyy') FROM dual;

5. In which scenario would index be most useful?

A) The indexed column contains a wide range of values.
B) The indexed columns are used in the FROM clause.
C) The indexed columns are part of an expression.
D) The indexed column is declared as NOT NULL.

Solutions: