顯示最高和最低值Sqlplus

Question

我是SqlPlus的新手，我試圖顯示所有部門中最高和最低的平均工資。到目前爲止，我只能顯示最高的薪水，但我似乎無法顯示最低的薪水。

這是我走到這一步，

SELECT deptno AS "Dept. No", MAX(sal) AS "Salary" 
FROM emp e 
WHERE e.sal > (SELECT avg(sal) FROM emp) 
GROUP BY deptno; 

我得到的輸出是

Dept. No Salary 
30   2850 
20   3000 
10   5000 

我試圖讓

Dept. No Salary 
30   2850 
30   950 
20   3000 
20   800 
10   5000 
10   1300 

哦，我現在用的是部門和emp表格樣本！

Answer 1

如果有其他人有同樣的問題，此查詢適用於我！ :)

SELECT deptno AS "Dept. No", MAX(sal) AS "Highest Salary", MIN(sal) AS "Lowest Salary" 
FROM emp 
GROUP BY deptno;