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11i/2.6 Implement Oracle Workflow

Oracle Training Create a job program schedule and window

Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
DEPARTMENT_ID NUMBER
SALARY NUMBER
What is the correct syntax for an inline view?

A. SELECT a.last_name, a.salary, a.department_id,
b.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;
B. 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))
C. 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);
D. 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);

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Answer: A

Explanation:
This SQL statement shows correct syntax to build inline views. You must enclose the query text for the inline
view in parentheses and also give a label for the inline view so that columns in it can be referenced later. In
answer A inline view is marked as B.
Incorrect Answers
B: This SQL statement will fail because it is not correct syntax for inline views. There is no a label for this inline
view also.
C: This SQL statement will fail because it is not correct syntax for inline views. There is no a label for this
inline view also.
D: This SQL statement will fail because it is not correct syntax for inline views. There is no a label for this
inline view also.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 162-165
Chapter 4: Subqueries