将日期转换成年 比如2019-10-11(2019) - 2018-10-11(2018)
select a.lx,a.rq
from tb_da_hj a
left join tb_da_hj b on a.emid=b.emid and datediff(mm,a.rq+ '-01',getdate())/12>datediff(mm,b.rq+ '-01',getdate())/12
group by a.lx,a.rq
having count(distinct case when datediff(mm,a.rq+ '-01',getdate())/12-datediff(mm,b.rq+ '-01',getdate())/12=1 then a.lx end)>0
and count(distinct case when datediff(mm,a.rq+ '-01',getdate())/12-datediff(mm,b.rq+ '-01',getdate())/12=2 then a.lx end)>0
select distinct CONVERT(varchar(4), rq, 120 ) from tb_da_hj
