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
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