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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES table:

What is the correct syntax for an inline view?

A) SELECT a.last_name, a.salary, a.department_id,
B) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE a.salary =
(SELECT max(salary)
FROM employees b
WHERE a.department_id = b.department_id);
C) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE (a.department_id, a.salary) IN
(SELECT department_id, a.salary) IN
(SELECT department_id max(salary)
FROM employees b
GROUP BY department_id
ORDER BY department_id);
D) SELECT a.last name, a.salary, a.department_id FROM employees a WHERE a.department_id IN (SELECT department_id FROM employees b GROUP BY department_id having salary = (SELECT max(salary) from employees))
E) maxsal FROM employees a, (SELECT department_id, max(salary)maxsal FROM employees GROUP BY department_id) b WHERE a.department_id = b.department_id AND a.salary < b.maxsal;

2. Which clause would you use in a SELECT statement to limit the display to those employees whose salary is greater then 5000?

A) HAVING SALARY > 5000
B) WHERE SALARY > 5000
C) GROUP BY SALARY > 5000
D) ORDER BY SALARY > 5000

3. Which three are true? (Choose three.)

A) A MERGE statement is used to merge the data of one table with data from another.
B) A MERGE statement can be used to update existing rows in a table.
C) A MERGE statement replaces the data of one table with that of another.
D) A MERGE statement can be used to insert new rows into a table.

4. The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
ENAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
Which SQL statement will return the ENAME, length of the ENAME, and the numeric position of the letter "a" in the ENAME column, for those employees whose ENAME ends with a the letter "n"?

A) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, ,-1,1) FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';
B) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, -1, 1) = 'n';
C) SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR(ENAME, 1, 1) = 'n';
D) SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, 'a') FROM EMPLOYEES WHERE SUBSTR(ENAME, -1, 1) = 'n';

5. The CUSTOMERS table has these columns:

The CUSTOMER_ID column is the primary key for the table.
Which two statements find the number of customers? (Choose two.)

A) SELECT COUNT(customers) FROM customers;
B) SELECT COUNT(customer_id) FROM customers;
C) SELECT TOTAL(*) FROM customers;
D) SELECT TOTAL(customer_id) FROM customers;
E) SELECT COUNT(*) FROM customers;
F) SELECT TOTAL(customer_name) FROM customers;

Solutions: