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a
- 使用scott/tiger用户下的emp表完成下列练习,查询,删除增改-Using the scott/tiger user under the emp table to complete the following exercises, query, delete the additions and changes to
HOMEWORK4
- emp(eno, ename, salary, mgr),其中mgr是员工领导,设计约束:要求领导的工资不能低于他的下属平均工资。(注意,这是一个递归查询)-emp (eno, ename, salary, mgr), which is the employee mgr leadership, design constraints: the requirement that lead not be lower than the wages of the average wage of his s