我对下面的声明有疑问。查询的主要目的是将客户列表从 ODBC 提取到 Access 数据库中（我们的客户存储在 IBM i 上的 DB2 中）。该查询旨在查找超过 13 个月未交付 (RS2101F.DELDATE) 但尚未被抑制 (OM01U1.OM01068) 的客户 (OM01U1.OM01015)。我确实需要所有的列来研究设备和财务记录，所以我无法移除它们。不过，该声明是从几个表中提取的。我认为问题可能出在“Group By”上。当我收到结果时，我也得到了重复的出口 (OM01U1.OM01015)。我只需要看到最后一次交货日期 (RS2101F.DELDATE) 一次。请不要把我打得太糟，我没有创建这个查询，我只是继承了它。我知道这很遥远，而且可能有更好的方法来获取我需要的信息。我感谢任何帮助家伙！
SELECT
OM01U1.OM01041 as Loc,
OM01U1.OM01015 AS Outlet,
OM01U1.OM01945 AS OLTyp,
OM01U1.OM01052 AS Outlet_Name,
OM01U1.OM01054A AS Street_Number,
OM01U1.OM01054C AS Street_Name,
OM01U1.OM01055A AS City,
OM01U1.OM01055B AS State,
OM01U1.OM01106 AS Zip,
OM01U1.OM01058A AS Area_Code,
OM01U1.OM01058C AS Phone,
OM01U1.OM01037 AS Channel,
OM01U1.OM01926 AS USA_Type,
OM01U1.OM01078 AS Key_Acct,
OM01U1.OM01110 AS TRDGRP,
OM01U1.OM01034 AS Trade_Name,
OM01U1.OM01248 AS DTC,
OM01U1.OM01073 AS Sales_Route,
OM01U1.OM01068 AS Sup_CDE,
OM01U1.OM01982 …