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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A subquery can be used to _________.

A) Create groups of data
B) Convert data to a different format
C) Sort data in a specific order
D) Retrieve data based on an unknown condition

2. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which MERGE statement is valid?

A) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT INTO new_employees VALUES (e.employee_id, e.first_name ||', '||e.last_name);
B) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES(e.employee_id, e.first_name ||', '||e.last_name);
C) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);
D) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);

3. Evaluate this SQL statement:
SELECT e.employee_id, (.15* e.salary) + (.5 * e.commission_pct)
+ (s.sales amount * (.35 * e.bonus)) AS CALC_VALUE FROM employees e, sales s WHERE e.employee_id = s.emp_id;
What will happen if you remove all the parentheses from the calculation?

A) An error will be reported.
B) The value displayed in the CALC_VALUE column will be lower.
C) The value displayed in the CALC_VALUE column will be higher.
D) There will be no difference in the value displayed in the CALC_VALUE column.

4. Exhibit

Evaluate this SQL statement: SELECT cust_id, ord_total FROM orders WHERE ord_total > ANY (SELECT ord_total FROM orders WHERE cust_id IN (SELECT cust_id FROM customers WHERE city LIKE 'New York'));
What is the result when the above query is executed?

A) Option D
B) Option F
C) Option B
D) Option C
E) Option E
F) Option A

5. Examine the structures of the EMPLOYEES and TAX tables.

You need to find the percentage tax applicable for each employee. Which SQL statement would you use?

A) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent
B) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min_salary AND t.max_salary;
C) You cannot find the information because there is no common column between the two tables.
D) SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary

Solutions: