งบประมาณรวมของโรงเรียน "เกลน" ตลอดทั้งปีคือเท่าไร?
What is the total budget amount for school "Glenn" in all years?
budget = pd.DataFrame(columns=['budgeted', 'school_id']); school = pd.DataFrame(columns=['school_id', 'school_name'])
budget[budget['school_id'].isin(school[school['school_name']=='Glenn']['school_id'])]['budgeted'].sum()