Question

i have one table (A) which has column caseid and citin ,
caseid can have same citin ,
i want a query where i want particular citin which has 2 or more caseid
I tried

select a.caseid from A as a 
 where citin in (select citin, caseid from A as c  where c.caseid != a.caseid )

Can someone help ?

Answer 1

select a.citin, count(a.caseid) 
from A a 
group by a.citin
having count(a.caseid) > 1