1z0-071 Exam Dumps | You must find the number of employees whose salary is lower than employee 110. Which statement fails

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Question 123/144

You must find the number of employees whose salary is lower than employee 110.
Which statement fails to do this?

A. SELECT COUNT (*)
FROM employees
JOIN employees a
ON e. salary< a. salary
WHERE a. employee_id= 110;

B. SELECT COUNT (* )
FROM employees
WHERE salary < (SELECT salary FROM employees WHERE employee_id =
110) ;

C. SELECT COUNT (*)
FROM employees e
JOIN (SELECT salary FROM employees WHERE employee_id= 110) a
ON e. salary< a. salary;

D. SELECT COUNT (* )
FROM employees e
WHERE e. salary < (SELECT a. salary FROM employees a WHERE e. employee_id = 110);

Correct Answer: D

In this context, the correct answers will provide a count of employees with a salary less than that of employee with ID 110. Let's evaluate the provided statements:
A: This statement is incorrect due to a syntax error; it uses alias 'e' without defining it, and 'a' is also used incorrectly in the JOIN clause. It should have been written with proper aliases.
B: This statement is correct as it uses a subquery to find the salary of employee ID 110 and compares it to the salaries of all employees to get the count.
C: This statement is also correct as it creates a derived table with the salary of employee ID 110 and compares it with the salaries of the 'employees' table using a JOIN.
D: This is the statement that fails. It is incorrect because the subquery references 'e.employee_id = 110', which will compare the salary of each employee to themselves if their ID is 110, not to the salary of employee 110 for all employees.

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