select DEPARTMENT,count(STAFF_ID) as CountStaff, avg(SALARY) as AVGSalaryfrom STAFFgroup by DEPARTMENThaving count(STAFF_ID) > 5

select DEPARTMENT,count(STAFF_ID) as CountStaff, avg(SALARY) as AVGSalaryfrom STAFFgroup by DEPARTMENThaving count(STAFF_ID) > 5