SQL Developer - SQL 错误：ORA-00909：参数数量无效

Question

在 HR 模式中，我想按不同国家/地区的部门列出所有薪水

SELECT E.FIRST_NAME , S.COUNTRY_NAME, S.DEPARTMENT_NAME, S.AVG_SALARY, E.SALARY 
FROM EMPLOYEES E JOIN (SELECT COUNTRY_NAME, DEPARTMENT_NAME, ROUND(AVG(SALARY,0) AS "AVG_SALARY", DEPARTMENT_ID
                       FROM (SELECT SALARY, COUNTRY_NAME, DEPARTMENT_NAME, DEPARTMENT_ID
                             FROM EMPLOYEES JOIN DEPARTMENTS USING (DEPARTMENT_ID)
                             JOIN LOCATIONS USING (LOCATION_ID)
                             JOIN COUNTRIES USING (COUNTRY_ID)
                             )
                       GROUP BY COUNTRY_NAME, DEPARTMENT_NAME, DEPARTMENT_ID
                       )   S ON (E.DEPARTMENT_ID=S.DEPARTMENT_ID)
WHERE E.SALARY< S.AVG_SALARY AND E.DEPARTMENT_ID = S.DEPARTMENT_ID
GROUP BY COUNTRY_NAME, DEPARTMENT_NAME, AVG_SALARY, FIRST_NAME, SALARY
ORDER BY COUNTRY_NAME;

Answer 1

确保你的括号匹配。

ROUND(AVG(SALARY,0)

应该是：

ROUND(AVG(SALARY),0)