ユーザーに関連するカテゴリごとの値を取得するにはどうすればよいですか？

select `User Name`,
    sum(case when Status = 'Open' then 1 end) as Open,
    sum(case when Status = 'Assigned' then 1 end) as Assigned,
    sum(case when Status = 'Closed' then 1 end) as Closed
from Status
group by `User Name`