ORACLE 如何选择薪酬排名第三和第五的员工？ ORACLE 人力资源计划 [重复]

Question

我用过这个，它给了我第三高的薪水。但我需要第三和第五高的薪水。

SELECT * FROM 
(
SELECT
ROWNUM, HR.DEPARTMENTS.DEPARTMENT_NAME, HR.EMPLOYEES.FIRST_NAME, HR.EMPLOYEES.LAST_NAME, HR.EMPLOYEES.SALARY 

FROM HR.EMPLOYEES 
    JOIN HR.DEPARTMENTS  ON HR.EMPLOYEES.DEPARTMENT_ID = HR.DEPARTMENTS.DEPARTMENT_ID
    WHERE (HR.DEPARTMENTS.DEPARTMENT_NAME = 'IT' OR HR.DEPARTMENTS.DEPARTMENT_NAME = 'Sales' OR HR.DEPARTMENTS.DEPARTMENT_NAME = 'Finance')
    ORDER BY HR.EMPLOYEES.SALARY desc
    )
    OFFSET 2 ROWS
    FETCH NEXT 1 ROW ONLY

我试过之后

SELECT
ROWNUM, HR.DEPARTMENTS.DEPARTMENT_NAME, HR.EMPLOYEES.FIRST_NAME, HR.EMPLOYEES.LAST_NAME, HR.EMPLOYEES.SALARY,row_number() over (order by HR.EMPLOYEES.SALARY desc) AS n

FROM HR.EMPLOYEES 
    JOIN HR.DEPARTMENTS  ON HR.EMPLOYEES.DEPARTMENT_ID = HR.DEPARTMENTS.DEPARTMENT_ID
    WHERE (HR.DEPARTMENTS.DEPARTMENT_NAME = 'IT' OR HR.DEPARTMENTS.DEPARTMENT_NAME = 'Sales' OR HR.DEPARTMENTS.DEPARTMENT_NAME = 'Finance') AND (n = 3 OR n = 5)
    ORDER BY HR.EMPLOYEES.SALARY desc

ORA-00904：“N”：无效标识符

谁能帮帮我？

Answer 1

你必须在子查询之外使用 where：

SELECT a.* from
(SELECT ROWNUM, HR.DEPARTMENTS.DEPARTMENT_NAME, 
        HR.EMPLOYEES.FIRST_NAME, HR.EMPLOYEES.LAST_NAME, HR.EMPLOYEES.SALARY,
        row_number() over (order by HR.EMPLOYEES.SALARY desc) AS n  
FROM HR.EMPLOYEES 
    JOIN HR.DEPARTMENTS ON HR.EMPLOYEES.DEPARTMENT_ID = HR.DEPARTMENTS.DEPARTMENT_ID
    WHERE HR.DEPARTMENTS.DEPARTMENT_NAME in ('IT','Sales','Finance'))
) a 
where a.n in (3,5)

您还可以使用 IN 来简化查询。希望这会有所帮助。