根據列值升序和降序

Question

我有一個EMPLOYEE表EMP_ID,NAME和DEPARTMENT_ID。

我想訂購奇數DEPARTMENT_ID的所有記錄爲ASC，甚至DEPARTMENT_ID爲DESC。

可以這樣做嗎？

謝謝

Answer 1

可以在ORDER BY使用CASE，相應地更改標誌：

... 
ORDER BY CASE WHEN DEPARTMENT_ID % 2 = 0 
     THEN -DEPARTMENT_ID 
     ELSE DEPARTMENT_ID END ASC; 

Answer 2

使兩個查詢，第一個過濾器的賠率，第二對。按照您的意願訂購，然後聯合查詢。

SELECT e.* FROM (SELECT * 
FROM EMPLOYEE 
WHERE MOD(DEPARTMENT_ID, 2) = 1 
ORDER BY DEPARTMENT_ID ASC) e 
UNION ALL 
SELECT e1.* FROM (SELECT * 
FROM EMPLOYEE 
WHERE MOD(DEPARTMENT_ID, 2) = 0 
ORDER BY DEPARTMENT_ID DESC) e1 

Answer 3

試試這個

SELECT * 
FROM EMPLOYEE 
ORDER BY CASE WHEN DEPARTMENT_ID % 2 = 1 then 1 else 2 end,DEPARTMENT_ID