需求：根据部门分组，显示每个部门的工资等级(百度经验)

实例： 初始化数据 create table employee (empid int ,deptid int ,salary decimal(10,2))insert into employee values(1,10,5500.00)insert into employee values(2,10,4500.00)insert into employee values(3,20,1900.00)

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