Question

我无法理解代码中的错误。有人可以帮帮我吗？

这是我的SQL查询

SELECT S.SUBSTR(ASSIGNED_NUMBER, -4) FROM (
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA1 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
   UNION ALL
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA2 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
) AS S GROUP BY S.SUBSTR(ASSIGNED_NUMBER, -4);

Note: Originally, My outer column is S.SDATE and edited it to S.SUBSTR(ASSIGNED_NUMBER, -4)。

输出：

ORA-00933: SQL command not properly ended 00933. 00000 - "SQL command not properly ended"

顺便说一下，ASSIGNED_NUMBER列中的示例日期为58-2016。我使用substring来获得2016年

Answer 1

当您在子查询别名SDATE中给出列时，您正在使用S.SUBSTR（ASSIGNED_NUMBER，-4）。

此外，使用子查询时，命名应为) s而不是) AS S

您的查询应该是

SELECT S.SDATE FROM (
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA1 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
   UNION ALL
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA2 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
) S GROUP BY S.SDATE;

Answer 2

SELECT S.SDATE FROM (
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA1 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
   UNION ALL
   SELECT SUBSTR(ASSIGNED_NUMBER, -4) AS SDATE FROM TBL_DATA2 GROUP BY SUBSTR(ASSIGNED_NUMBER, -4)
)  S GROUP BY S.SDATE;

对于Union All，SQL命令未正确结束

2 个答案: