sql - counting groups which contain an element with a certain attribute -


i have table containing 3 values 

create table x ( start      integer not null, end        integer not null, random     integer not null);

i want count amount of groups (group start,end) contain @ least 1 element random > 42 bigger 1 element. far know having can used aggregate functions.

my current attempt:

select count(*) ( select count(*) routes  group start,end  having random > 42  , count(*) > 1);

results in

no such column: random

what efficient way solve problem?

select count(*)  (select sum(case when random > 42 1 else 0 end) cnt         routes          group start,end        having count(*) > 1) t cnt > 1

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