select c.部门名称,b.人数from(select a.dno,sum(a.人数)as 人数from Employee agroup by a.Dno)b,Dept cwhere c.dno = b.dnoand b.人数 = (select max(d.人数)from(select a.dno,sum(a.人数)as 人数from Employee agroup by a.Dno)d)