错误：ORA-00905：将表连接到选择查询时缺少关键字

Question

我正在尝试将表链接到选择查询，我得到错误：ORA-00905：缺少关键字。这是我写过的oracle sql。

当我单独运行数据时，数据拉动。当我尝试加入它时，我得到了错误。我尝试按照我在互联网上找到的一些帮助信息添加Group BY和Order，但仍然会收到同样的错误。

SELECT

AS_MASTER_NF.CONTRACT_NO
, AS_HISTORY_NF.AH_CONTRACT_NBR
, AS_MASTER_NF.ID
, AS_MASTER_NF.A_INVENT_DATE
, AS_MASTER_NF.A_DISP_DATE

FROM INFL_IDS.AS_MASTER_NF
LEFT JOIN (SELECT
               NVL(SUBSTR(ALTERNATE_ID, 0, INSTR(ALTERNATE_ID, '*')-1), ALTERNATE_ID) AS ASSET
              , AS_HISTORY_NF.AH_CONTRACT_NBR
               FROM INFL_IDS.AS_HISTORY_NF
               WHERE LENGTH (AH_CONTRACT_NBR)> 3) AS ASHISTORY
           ON INFL_IDS.AS_MASTER_NF.ID = INFL_IDS.ASHISTORY.ASSET

WHERE AS_MASTER_NF.A_INVENT_DATE IS NOT NULL

GROUP BY
AS_MASTER_NF.CONTRACT_NO
, AS_HISTORY_NF.AH_CONTRACT_NBR
, AS_MASTER_NF.ID
, AS_MASTER_NF.A_INVENT_DATE
, AS_MASTER_NF.A_DISP_DATE

ORDER BY
AS_MASTER_NF.CONTRACT_NO
, AS_HISTORY_NF.AH_CONTRACT_NBR
, AS_MASTER_NF.ID
, AS_MASTER_NF.A_INVENT_DATE
, AS_MASTER_NF.A_DISP_DATE

FETCH FIRST 20 ROWS ONLY

Answer 1

变化：

    ON INFL_IDS.AS_MASTER_NF.ID = INFL_IDS.ASHISTORY.ASSET

为：

    ON INFL_IDS.AS_MASTER_NF.ID = ASHISTORY.ASSET

因为ASHISTORY不是INFL_IDS架构下的表或视图，而只是在此sql中定义的子查询。