sql交叉查询

sql： select gwlb， count(case when (year(getdate())-year(rybirthday)) between 20 and 30 then rygh end) as '20-30', count(case when (year(getdate())-year(rybirthday)) between 30 and 40 then rygh end) as '30-40', count(case when (year(getdate())-year(rybirthday)) between 40 and 50 then rygh end) as '40-50', count(case when (year(getdate())-year(rybirthday)) between 50 and 60 then rygh end) as '50-60', count(case when (year(getdate())-year(rybirthday)) between 60 and 70 then rygh end) as '60-70' from t_ry group by gwlb