集團通過結果作爲單獨的列名

Question

如何獲得GROUPBY結果作爲列名

如果員工表是那裏，當我們使用來自員工隊伍

SELECT COUNT（*）按性別;讓我爲

，但我需要他們作爲男欄|女性|無

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;