mysql按順序生成一個不重複的id

非字母和非0開頭按順序生成一個不重複的id

select case when max(id) is null then '10000001' else max(id)+1 end as id from student;

字母開頭按順序生成一個不重複的id

select case when max(id) is null then 'S10000001' else CONCAT('S',SUBSTRING(max(id),2)+1) end as id from student;