select '0-10' as t,count(distinct id) as sum from t where age<=10
union
select '11-20' as t,count(distinct id) as sum from t where age<=20 and age>11
uion
select '>20' as t,count(distinct id) as sum from t where age>20
union
select '11-20' as t,count(distinct id) as sum from t where age<=20 and age>11
uion
select '>20' as t,count(distinct id) as sum from t where age>20
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