Mysql数据分组和正则表达式

Question

<分区>

Answer 1

您可以使用 case 语句进行聚合:

select (case when code between 'A00' and 'A99' then 'A00-A99'
             when code between 'B00' and 'C48' then 'B00-C48'
             when code between 'C49' and 'D99' then 'C49-D99'
             . . .
        end) as codeGroup,
       count(*)
from t
group by codeGroup
order by codeGroup;