甲骨文在一個查詢中顯示分鐘（），MAX（）

Question

我有一個表---- 工程（employer_name，employee_name，薪水）

我想要的結果，以顯示由每個min和max薪水組僱主，請參閱下文。

作品

Employer Employee Max Min 
A  B  Y 
A  C    Y 
N  K  Y  
N  P    Y 

任何想法？非常感謝。

乾杯， 本

Answer 1

這個怎麼樣？這不完全是你要求的，但應該做的工作就好:)

SELECT w.*, 
    (SELECT employee_name FROM works WHERE employer_name = w.Employer AND salary = w.Min AND ROWNUM <= 1) AS EmployeeMin, 
    (SELECT employee_name FROM works WHERE employer_name = w.Employer AND salary = w.Max AND ROWNUM <= 1) AS EmployeeMax 
FROM (
    SELECT employer_name AS Employer, 
     min(salary) AS Min, 
     max(salary) AS Max 
    FROM works 
    GROUP BY Employer 
) AS w