BACKUP DATABASE  hbcct to disk=c:/1.bak 

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

select 字段1,字段2,isnull(字段1,0)+isnull(字段2,0) from 表