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create table tb(dq varchar(20),mj float)
insert into tb(dq,mj)
select 'A',10 from dual
union all
select 'B',6 from dual
union all
select 'C',69 from dual
union all
select 'A',30 from dual
union all
select 'B',40 from dual
select
dq as 所属地区,
sum(case when mj<10 then 1 else 0 end) as "10以下",
sum(case when mj>=10 and mj<20 then 1 else 0 end) as "10~20",
sum(case when mj>=20 and mj<50 then 1 else 0 end) as "20~50",
sum(case when mj>=50 then 1 else 0 end) as "50以上"
from tb
group by dq
/*
所属地区 "10以下" "10~20" "20~50" "50以上"
1 A 0 1 1 0
2 B 1 0 1 0
3 C 0 0 0 1
*/