//排序 desc 降序 asc 升序
select * from a order by clum1 desc, clum2 asc;
//多字的合并排序
select * from a order by concat(clum1,clum2) desc
//排序 desc 降序 asc 升序
select * from a order by clum1 desc, clum2 asc;
//多字的合并排序
select * from a order by concat(clum1,clum2) desc