如何比较两个字段，然后在Microsoft Access中设置布尔值？

这是我当前的查询：如何比较两个字段，然后在Microsoft Access中设置布尔值？

SELECT i.itemNo, Nz(TotalOrdered,0) AS Sumofqtyordered, Nz(TotalReturned,0) AS sumofqtyreturn, Nz(TotalIssued,0) AS sumofqtyissued, (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;

如何领域（minqty）在我的项目表与查询余额比较？我将在此查询中添加一个字段PlaceOrder（布尔）。当余额小于minqty时设置为yes，当minqty大于或等于minqty时设置为no？任何1可以帮助我的代码？

来源

2014-03-24 UnusualSkill

添加到您的SELECT：

((Nz(TotalOrdered,0)-Nz(TotalIssued,0)-Nz(TotalReturned,0))<[minqty]) AS PlaceOrder

它会返回-1（真）或0（假）。如果你想让它实际上将返回“是”或“否”：

IIf((Nz(TotalOrdered,0)-Nz(TotalIssued,0)-Nz(TotalReturned,0))<[minqty],'Yes','No') AS PlaceOrder

来源

2014-03-24 15:42:14 Mike

THX了很多...但我可以更换NZ（totalordered，0），......与平衡有任何可能影响？ – UnusualSkill

你应该可以做到这一点没有问题 – Mike

嗨，希望你还记得这一点。我可以问你，如果我想产生一个错误消息，当（qtyreturned的总和+ qtyissued的总和）超过qtyordered的总和，这可以通过编写代码或任何其他方法进行访问？谢谢 – UnusualSkill

如何比较两个字段，然后在Microsoft Access中设置布尔值？

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