Question

当（sumofqtyreturn + sumofqtyissued）大于sumofqtyordered时，我想生成错误消息。我想执行此验证检查，以便当用户输入大于余额的值（qtyreturn或qtyissued）时，系统应该产生错误。可以这样做吗？

这是我查询的sql视图：

SELECT i.itemNo, Nz(TotalOrdered,0), Nz(TotalReturned,0), Nz(TotalIssued,0), 
     (Nz(TotalOrdered,0)-Nz(TotalIssued,0)+Nz(TotalReturned,0)) AS Balance

FROM ((item AS i 

LEFT JOIN (SELECT itemno, Sum(qtyordered) AS TotalOrdered 

FROM delivered_item 

GROUP BY itemno)  AS d ON d.itemno=i.itemno)

LEFT JOIN (SELECT itemno, Sum(qtyreturn) AS TotalReturned FROM item_return 

GROUP BY itemno)  AS r ON r.itemno=i.itemno)

LEFT JOIN (SELECT itemno, Sum(qtyissued) AS TotalIssued FROM item_issued 

GROUP BY itemno)  AS iss ON iss.itemno=i.itemno

或者any1对如何通知/警告用户qtyissued / qtyreturn有什么问题有其他好主意？（值太大）

Answer 1

这是一般性的想法。

SELECT q.AText, 
       q.SumOfANumber, 
       q.SumOfADecimal, 
       IIf([SumOfANumber]-[SumOfADecimal]<0,"Problem!","Yes") AS IsOkay
FROM (SELECT t.AText, 
            Sum(t.ANumber) AS SumOfANumber, 
            Sum(t.ADecimal) AS SumOfADecimal
      FROM Table1 As t
      GROUP BY t.AText)  AS q;

聚合查询成为子查询，并在主查询中比较相关字段。我已经为Table1使用了别名，因此你有Table1 As t和子查询。

Microsoft Access - 如何执行验证检查并生成错误消息

1 个答案: