select 职工号 from 职工 as a where 月工资=(select max(月工资) from 职工 as b wherea.部门号=b.部门号)
select 职工号 from 职工 as a where 月工资=(select max(月工资) from 职工 as b )
select 职工号 from 职工 as a where max(月工资)
select 职工号 from 职工 as a where max(月工资) from 职工 as b wherea.部门号=b.部门号

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