Group By 结果作为单独的列名

Question

如何获取 groupby 结果作为列名

如果我们使用的时候有职员表

按性别从员工组中选择计数（*）；给我作为

但我需要它们作为列女 |无

Answer 1

select sum(case when gender = 'Male' then 1 else 0 end) as 'Male',
sum(case when gender = 'Female' then 1 else 0 end) as 'Female',
sum(case when gender not in ('Male','Female') or gender is null then 1 else 0 end) as 'None'
from staff;