[英]Not a single-group group function Oracle SQL
我必須找到員工人數最多的部門的名稱和國家/地區。
SELECT d.department_name, c.country_name FROM employees e, departments d, locations l, countries c
WHERE d.location_id = l.location_id AND l.country_id = c.country_id
HAVING MAX(e.employee_id) = (SELECT MAX(MAX(employee_id)) FROM employees GROUP BY department_id);
我收到的不是單組分組功能錯誤。 這是為什么?
如果沒錯,這就是您要尋找的
SELECT *
FROM (SELECT d.department_name,
c.country_name
FROM employees e
INNER JOIN departments d
ON e.department_id = d.department_id
INNER JOIN locations l
ON d.location_id = l.location_id
INNER JOIN countries c
ON l.country_id = c.country_id
GROUP BY d.department_name,
c.country_name
ORDER BY Count(1) DESC)
WHERE ROWNUM = 1
這是你想要的嗎?
SELECT d.department_name, c.country_name FROM employees e, departments d, locations l, countries c
WHERE d.location_id = l.location_id AND l.country_id = c.country_id
AND ROWNUM = 1
ORDER BY e.employee_id DESC
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.