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select 班级,
sum(case 性别 when '男' then 1 else 0 end) 男生人数,
sum(case 性别 when '女' then 1 else 0 end) 女生人数
from tb
group by 班级
select banji,sum(case when sex='lan' then 1 else 0 end) lan,sum(case when sex='nv' then 1 else 0 end) nv from tb group by banji
select 班级,
'男的'+sum(case when 性别 = '男' then 1 else 0 end)+'个,'+
'女的'+sum(case when 性别 = '女' then 1 else 0 end)+'个' as col
from TA
group by 班级