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1. Examine the structure of the EMPLOYEES table:

Which INSERT statement is valid?

A) INSERT INTO employees(employee_id, first_name, last_name, Hire_date) VALUES ( 1000, 'John', 'Smith', To_date('01/01/01'));
B) INSERT INTO employees (employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', '01/01/01');
C) INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', '01 January 01');
D) INSERT INTO employees(employee_id, first_name, last_name, hire_date) VALUES ( 1000, 'John', 'Smith', 01-Jan-01);

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

3. Evaluate the SQL statement
DROP TABLE DEPT:
Which four statements are true of the SQL statement? (Choose four)

A) All pending transactions are committed.
B) All indexes based on the DEPT table are dropped.
C) You cannot roll back this statement.
D) All synonyms based on the DEPT table are deleted.
E) All data in the table is deleted, and the table structure is also deleted.
F) All data in the table is deleted, but the structure of the table is retained.
G) All views based on the DEPT table are deleted.

4. Which two statements are true about WHERE and HAVING clauses? (Choose two)

A) A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.
B) A HAVING clause CANNOT be used in subqueries.
C) A HAVING clause can be used to restrict both rows and groups.
D) A WHERE clause can be used to restrict both rows and groups.
E) A WHERE clause can be used to restrict rows only.
F) A HAVING clause can be used to restrict groups only.

5. You need to write a SQL statement that returns employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
Which statement accomplishes this task?

A) SELECT a.emp_name, a.sal, b.dept_id, MAX(sal) FROM employees a, departments b WHERE a.dept_id = b.dept_id AND a.sal < MAX(sal) GROUP BY b.dept_id;
B) SELECT emp_name, sal, dept_id, maxsal FROM employees, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) WHERE a.sal < maxsal;
C) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) b WHERE a.dept_id = b.dept_id AND a.sal < b.maxsal;
D) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a WHERE a.sal < (SELECT MAX(sal) maxsal FROM employees b GROUP BY dept_id);

問題與答案：