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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Evaluate this SQL statement:
SELECT ename, sal, 12*sal+100 FROM emp;
The SAL column stores the monthly salary of the employee. Which change must be made
to the above syntax to calculate the annual compensation as "monthly salary plus a
monthly bonus of $100, multiplied by 12"?

A) No change is required to achieve the desired results.
B) SELECT ename, sal, 12*(sal+100) FROM emp;
C) SELECT ename, sal, (12*sal)+100 FROM emp;
D) SELECT ename, sal+100,*12 FROM emp;

2. Evaluate these two SQL statements:
SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?

A) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
B) The two statements produce identical results.
C) There is no need to specify DESC because the results are sorted in descending order by default.
D) The second statement returns a syntax error.

3. The PRODUCTS table has these columns:
PRODUCT_ID NUMBER (4)
PRODUCT_NAME VARCHAR2(45)
PRICE NUMBER(8,2)
Evaluate this SQL statement:
SELECT *
FROM PRODUCTS
ORDER BY price, product_name;
What is true about the SQL statement?

A) The results are sorted alphabetically.
B) The results are not sorted.
C) The results are sorted numerically and then alphabetically.
D) The results are sorted numerically.

4. You need to display the last names of those employees who have the letter "A" as the second character in their names.
Which SQL statement displays the required results?

A) SELECT last_name FROM EMP WHERE last name ='*A%'
B) SELECT last_name FROM EMP WHERE last name LIKE '*A%'
C) SELECT last_name FROM EMP WHERE last name ='_A%';
D) SELECT last_name FROM EMP WHERE last_name LIKE '_A%';

5. In which scenario would index be most useful?

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

Solutions: