Which position has the highest amount of poor performing employees?
poor performing employees refers to performance = 'Poor'; the highest amount of employees refers to MAX(positiontitle)
SELECT T2.positiontitle FROM employee AS T1  INNER JOIN position AS T2  ON T1.positionID = T2.positionID WHERE T1.performance = 'Poor' GROUP BY T2.positiontitle ORDER BY COUNT(T2.positiontitle) DESC LIMIT 1