「ORDER BY CASE ......」爲了使無效表達BY子句

Question

任何人都可以指出是什麼原因造成我獲得

無效表達ORDER BY子句（不包含在聚合函數或GROUP BY子句）

有關以下查詢的錯誤？這是在火鳥2.5。

SELECT COUNT(*) AS total, 
     CASE WHEN YR BETWEEN 1990 AND 1995 THEN '1990-1995' 
      WHEN YR BETWEEN 1996 AND 2000 THEN '1996-2000' 
      WHEN YR BETWEEN 2001 AND 2005 THEN '2001-2005' 
      ELSE '2005-2017' END AS vehicle_year 
FROM bb_history 
GROUP BY 2 
ORDER BY CASE WHEN YR BETWEEN 1990 AND 1995 THEN 1 
       WHEN YR BETWEEN 1996 AND 2000 THEN 2 
       WHEN YR BETWEEN 2001 AND 2005 THEN 3 
       ELSE 4 END 

Answer 1

不能在order by使用YR列，因爲它是不分組結果的一部分。看來你只是想通過生成的vehicle_year列順序，因此你可以通過（或2）命令：

SELECT COUNT(*) AS total, 
     CASE WHEN YR BETWEEN 1990 AND 1995 THEN '1990-1995' 
      WHEN YR BETWEEN 1996 AND 2000 THEN '1996-2000' 
      WHEN YR BETWEEN 2001 AND 2005 THEN '2001-2005' 
      ELSE '2005-2017' END AS vehicle_year 
FROM bb_history 
GROUP BY 2 
ORDER BY vehicle_year; 

Answer 2

你只有兩個選擇列，爲什麼你加入「3」和「4」，但這裏是查詢：

SELECT COUNT(*) AS total, 
     CASE WHEN YR BETWEEN 1990 AND 1995 THEN '1990-1995' 
      WHEN YR BETWEEN 1996 AND 2000 THEN '1996-2000' 
      WHEN YR BETWEEN 2001 AND 2005 THEN '2001-2005' 
      ELSE '2005-2017' END AS vehicle_year 
FROM bb_history 
GROUP BY 2 
ORDER BY CASE WHEN vehicle_year BETWEEN 1990 AND 1995 THEN 1 
       WHEN vehicle_year BETWEEN 1996 AND 2000 THEN 2 
       WHEN vehicle_year BETWEEN 2001 AND 2005 THEN 3 
       ELSE 4 END