题解 | #计算男生人数以及平均GPA#
计算男生人数以及平均GPA
https://www.nowcoder.com/practice/7d9a7b2d6b4241dbb5e5066d7549ca01
select
sum(case when gender="male" then 1 else 0 end) as male_num,
avg(case when gender="male" then gpa else null end) as avg_gpa
from user_profile
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