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
交叉查询的sql
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