mysql去重

select gmsfzh, xm, hjszd, rylxfrom (
select 
    a.gmsfzh, -- 身份证号码
    a.xm, -- 姓名
    a.hjszd, -- 户籍所在地
    a.rylx, -- 人员类型
    row_number() over(
	partition by a.gmsfzh
	order by a.gxsj desc
	) as rk
from tablename a ) 
where rk =1