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在下面的查询 c.EXTRA_CALLOFF_FLAG = a.EXTRA_CALLOFF_FLAG 它有两个匹配项，一个是 Y，另一个值为 NULL

SELECT PICKUP_WK_NBR,REGION_CD,GLOBAL_DUNS_NBR,GLOBAL_SUPPLIER_NAME,a.EXTRA_CALLOFF_FLAG,
       nvl((SELECT sum(c.CALLOFF_QTY)
               FROM GMMT_OWNER.OR_SA_ATTAIN_DTL_T c join GMMT_OWNER.OR_SA_INCOTERMS_T d
                 on
                  c.SUPPLIER_INCOTERMS_1_CD = d.INCOTERMS_CD
               WHERE
                  d.PICKUP_ARRIVAL_FLAG='P'  and
                  a.PICKUP_WK_NBR = c.PICKUP_WK_NBR and
                  a.GLOBAL_DUNS_NBR = c.GLOBAL_DUNS_NBR and
                  a.REGION_CD=c.REGION_CD and 
                  c.EXTRA_CALLOFF_FLAG = a.EXTRA_CALLOFF_FLAG and
                  a.SUPPLIER_INCOTERMS_1_CD = c.SUPPLIER_INCOTERMS_1_CD
                 ),0) total_items_ordered
FROM
                GMMT_OWNER.OR_SA_ATTAIN_DTL_T a join GMMT_OWNER.OR_SA_INCOTERMS_T b on
                a.SUPPLIER_INCOTERMS_1_CD = b.INCOTERMS_CD
WHERE
                b.PICKUP_ARRIVAL_FLAG='P' and
                (a.PICKUP_WK_NBR between '201301' AND '201301')  and
                a.SUPPLIER_INCOTERMS_1_CD IN ('EXW')        and 
                a.GLOBAL_DUNS_NBR IN ('43898092') and
                a.REGION_CD IN ('AP')                     
GROUP BY
                PICKUP_WK_NBR,REGION_CD,GLOBAL_DUNS_NBR,GLOBAL_SUPPLIER_NAME,a.EXTRA_CALLOFF_FLAG,a.SUPPLIER_INCOTERMS_1_CD
ORDER BY a.PICKUP_WK_NBR;

它给出了错误的结果。我不确定内部和外部表连接之间的 NULL 是否匹配？

4

1 回答 1

0

正如 Gordon 在评论中所说，您不能将 null 视为一个值。

不过，您可能应该重新考虑加入可以为空的列。

不过，听起来您想将其视为可能的值。一种方法是使用 nvl()。

这是使您的联接条件具有价值的一种方法。引号之间的字符串在等号两边必须相同。

改变

c.EXTRA_CALLOFF_FLAG = a.EXTRA_CALLOFF_FLAG

至

nvl(c.EXTRA_CALLOFF_FLAG, 'null') = nvl(a.EXTRA_CALLOFF_FLAG, 'null')
于 2013-04-24T14:15:49.090 回答