如何创建一个UNION查询，该查询将返回项目库存的最新日期？

Question

我有两个表，如下图所示，并希望将一个联合查询组合起来，但只返回任何项目的最新日期。

Answer 1

试试这个：

Select [Part Number], [Rack Number], [Row Number], Max([Date Scanned]) As [Last Scanned]
From 
    (Select [Part Number], [Rack Number], [Row Number], [Date Scanned]
    From Table1
    Union
    Select [Part Number], [Rack Number], [Row Number], [Date Scanned]
    From Table2)
Group By
    [Part Number], [Rack Number], [Row Number]