mysql中插入一条查询记录(带主键的)，且主键字段类型为varchar,内容为数值

insert into
A
(ID,name,age,score,classes)
select (select max(cast(ID as signed integer))+1 from A) ,'tom',21,score,classes
from A
WHERE
ID=1017;

—varchar 转 int 

cast(id as signed integer)  或者 cast(id as unsigned integer)