“ORDER BY CASE ......”为了使无效表达BY子句

Question

任何人都可以指出是什么原因造成我获得

无效表达ORDER BY子句（不包含在聚合函数或GROUP BY子句）

有关以下查询的错误？这是在火鸟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，因为它是不分组结果的一部分。看来你只是想通过生成的vehicle_year列顺序，因此你可以通过（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

你只有两个选择列，为什么你加入“3”和“4”，但这里是查询：

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