If you mean professional engineer then your answer will depend on your country of origin. In the US, you do not need to have a degree. Check out the NYS PE licensure educational/experience requirements table here: Table Without a degree, it requires you to have six years of relevant, recorded, and proven experience until you are eligible to sit for the Fundamentals of Engineering examination.
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Aggregate Functions Function Name Return Value Examples Return Value AVG(expr) Returns the average of the values in a set of rows AVG(endowment_unit_value) COUNT(expr) Returns the number of rows having a nonâ null value in the set COUNT(DISTINCT univ_id_no) COUNT(DISTINCT expr) Adds distinct processing to the Count function