[转载]交叉查询的sql
信息来源：《全球商人学院》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 gw
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