c1 > c2
c1 > 10 and c2 < 100
c1+c2+100
sum(c1+c2)
case c1 when 1 then 'a' when 2 then 'b' else 'c' end
case when c1 > 1 then 'a' when c1 < 100 then 'b' else 'c' end
(c1, c2) >= (1, 2)