Report the eid of every employee who manages at least two different people. Use the usual technique of table renaming and self-join, except use the keywords CROSS JOIN to take the Cartesian product of the two tables:

sales(eid, day, amount) employee(eid, name, salary, dept) manages(manager, junior) department(did, name, division) employee[dept] department[did] manages[manager] employee[eid] manages[junior] employee[eid] sales[eid] employee[eid]