試圖顯示導師的名字誰的工資比平均工資高

Question

我嘗試做的是

SELECT tName, avg(Tutor.salary) AS avgSalary 
FROM Tutor 
GROUP BY tName 
HAVING Tutor.salary > avgSalary; 

Answer 1

因爲你的問題是不完整的，我假設你有列tName和表Tutorsalary。你想要做的是提取平均值，然後進行比較：

SELECT tName, salary FROM Tutor 
WHERE 
salary > (SELECT avg(salary) FROM Tutor);