Question

任何人都可以指出导致我获得

的原因

ORDER BY子句中的表达式无效（未包含在聚合函数或GROUP BY子句中）

以下查询出错？这是在Firebird 2.5中。

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

您无法在YR中使用order by列，因为它不是分组结果的一部分。您似乎只想按生成的vehicle_year列进行排序，因此您可以按顺序（或按2）排序：

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

您只有两个选定的列，为什么您添加了＆＃39; 3＆＃39;和＆＃39; 4＆＃39;，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

＆＃34;按案例排序......＆＃34;导致ORDER BY子句中的表达式无效

2 个答案: