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  • update语句中使用子查询

    55. 更改 108 员工的信息: 使其工资变为所在部门中的最高工资, job 变为公司中平均工资最低的 job

    1). 搭建骨架

    update employees set salary = (
    
    ), job_id = (
    
    
    ) where employee_id = 108;

    2). 所在部门中的最高工资

    select max(salary)
    from employees
    where department_id = (
    select department_id
    from employees
    where employee_id = 108
    )

    3). 公司中平均工资最低的 job

    select job_id
    from employees
    group by job_id
    having avg(salary) =  (
    select min(avg(salary))
    from employees
    group by job_id
    )

    4). 填充

    update employees e set salary = (
    select max(salary)
    from employees
    where department_id = e.department_id
    ), job_id = (
    select job_id
    from employees
    group by job_id
    having avg(salary) =  (
    select min(avg(salary))
    from employees
    group by job_id
    )
    ) where employee_id = 108;

    56. 删除 108 号员工所在部门中工资最低的那个员工.
    1). 查询 108 员工所在的部门 id

    select department_id
    from employees 
    where employee_id = 108;

    2). 查询 1) 部门中的最低工资

    select min(salary)
    from employees
    where department_id = (
    select department_id
    from employees 
    where employee_id = 108;
    )

    3). 删除 1) 部门中工资为 2) 的员工信息

    delete from employees where salary = (
    select min(salary)
    from employees
    where department_id = (
    select department_id
    from employees 
    where employee_id = 108
    )
    ) and department_id = (
    select department_id
    from employees 
    where employee_id = 108
    )
    

      

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  • 原文地址:https://www.cnblogs.com/nbkyzms/p/5031436.html
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