Consider the following SQL statement:
SELECT employee_id, year, salary, avg(salary)
OVER
(PARTITION BY employee_id ORDER BY year ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) as result_1
FROM employee
ORDER BY employee_id, year
For each employee_id, what is returned as result_1?
A . Three year rolling average salary
B . Four year rolling average salary
C . Average salary across all employee_id values
D . Average employee_id
Answer: A
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