1、mysql自定義排序，指定排序輸出：
select
case when ajj_whcd="" then "未知"
when ajj_whcd in ("初中", "中學") then "初中"
when ajj_whcd in ("中專","中技","中專(中技)", "中師","技工","技校","普高","職專","職中", "高中","高中?") then "高中"
when ajj_whcd in ("專科", "大專", "大專?", "職高", "大專畢業", "高技", "高職") then "大專"
when ajj_whcd in ("本科","本科?","學士", "理科","函授本科", "大學","大學本科") then "本科"
else "研究生" end as whcd, count(ajj_sfzh)
from yw_ajj_saqscjdglj_aqscr
group by whcd
order by field(whcd,"初中","高中", "大專","本科","研究生","未知")
select @rows:=@rows + 1 as rows,pname,***,jobtype,education
from tsafe_pxrecords_kpi,(select @rows := 0) r
where str_to_date(concat(certi_end_year,'-',certi_end_month,'-',certi_end_day),'%y-%m-%d')>=date_format(now(),'%y-%m-%d')
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