Question

这是我目前的查询：

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;

如何将项目表中的字段（minqty）与查询中的余额进行比较？我将在此查询中再添加一个字段PlaceOrder（布尔值）。当余额小于minqty时设置为yes，当它大于或等于minqty时设置为yes？任何1可以帮助我的代码吗？

Answer 1

将此添加到您的SELECT：

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

它将返回-1（True）或0（False）。如果您希望它实际返回“是”或“否”：

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

如何比较两个字段，然后在Microsoft Access中设置布尔值？

1 个答案: