排序表

Question

我有以下规则来在EMPLOYEE表中的员工进行排序：当他们的部门是销售，排序的经验，否则排序薪金

这是什么我曾尝试过：

select FNAME||' '||LNAME as emp_name,salary,HIRE_DATE from employee 
where dept_id=(select dept_id from department where name='SALES') order by HIRE_DATE asc; 
UNION 
select FNAME||' '||LNAME as emp_name,salary,HIRE_DATE from employee 
where dept_id NOT IN (select dept_id from department where name='SALES') order by salary desc; 

由于我认为两个命令会引发错误。任何解决方案

Answer 1

试试这个：

select FNAME||' '||LNAME as emp_name,salary,HIRE_DATE from employee E 
join department D 
on E.dept_id=D.dept_id 
order by (case when D.name='SALES' then HIRE_DATE end), 
      (case when D.name<>'SALES' then salary end) desc 

Answer 2

使用解码：

SELECT fname || ' ' || lname AS emp_name 
     ,salary 
     ,hire_date 
    FROM employee e 
     ,department d 
    WHERE e.dept_id = d.dept_id 
ORDER BY decode(d.name,'SALES',experience,salary) 
; 

又见http://sqlfiddle.com/#!4/afa6f/1

Answer 3

销售部门首先显示，由聘用日期排序。其他部门按照工资排序。

select FNAME||' '||LNAME as emp_name,salary,HIRE_DATE 
    from employee 
inner join department 
    on employee.dept_id = department.dept_id 
order by 
-- Sales department is on top. Swap 0 and 1 if you want sales on bottom 
     case when department.name = 'SALES' 
      then 0 
      else 1 
     end, 
-- And employees are sorted by hire_date 
     case when department.name = 'SALES' 
      then employee.HIRE_DATE 
      else null 
     end, 
-- Employees from other departments are sorted by salary 
     employee.Salary desc 

Answer 4

SELECT e.fname||' '||e.lname as emp_name, e.salary, e.hire_date 
FROM employee e, department d 
WHERE e.dept_id = d.dept_id 
ORDER BY 
CASE 
WHEN d.name ='SALES' then 
hire_date ASC 
ELSE 
salary DESC 
END 

确定。道歉，试试这个 - 大概已经回答了。