[英]IIF Statement in Ms-Access
我有這3個表:
我正在使用此代碼將它們連接在一起(我正在使用Delphi):
ADOQ.SQL.Text := 'select a.IdArt as [Code d''Article], '+
'a.Nom,'+
'Str(a.Prix)+" TND" as Prix, '+
'(select Str(sum(QteEntree))+" "+a.unit from Stock where IdArt = a.IdArt group by IdArt) as [Quantite Entree],' +
'(select Str(sum(Qte))+" "+a.unit from Sold where IdArt = a.IdArt group by IdArt) as [Quantite Vendu],'+
'Str((select sum(QteEntree) from Stock where IdArt = a.IdArt group by IdArt) -' +
'(select sum(Qte) from Sold where IdArt = a.IdArt group by IdArt))+" "+a.unit as [Quantite Existe]'+
'from Article a ';
如您所見,當一個表中缺少記錄時,它將Null返回到DbGrid,因此我想用“0”替換該缺失記錄。 我試過這段代碼:
ADOQ.SQL.Text := 'select a.IdArt as [Code d''Article], '+
'a.Nom,'+
'Str(a.Prix)+" TND" as Prix, '+
'(select Str(sum(QteEntree))+" "+a.unit from Stock where IdArt = a.IdArt group by IdArt) as [Quantite Entree],' +
'(select IIF( IsNull(sum(Qte)), "111" , Format( sum(Qte),"00.00") ) from Sold where IdArt = a.IdArt group by IdArt) as [Quantite Vendu],'+
'Str((select sum(QteEntree) from Stock where IdArt = a.IdArt group by IdArt) -' +
'(select sum(Qte) from Sold where IdArt = a.IdArt group by IdArt))+" "+a.unit as [Quantite Existe]'+
'from Article a ';
但沒有改變,雖然這段代碼完美無缺:
ADOQ.SQL.Text := 'Select a.IdArt,IIF(( IsNull( s.qte) ), "00,00" , Format( (s.qte),"00.00") ) from Article a left join sold s on s.IdArt = a.IdArt';
我在這做錯了什么?
嘗試取出“由IdArt組”部分 - 它們似乎沒必要,因為您已經排除了WHERE子句中的所有其他部分。
否則,這樣的事情可能會改善您編寫查詢的方式:
select
a.IdArt as [Code d''Article],
a.Nom,
Str(a.Prix)+" TND" as Prix,
Str(sum(stock.QteEntree))+" "+a.unit as [Quantite Entree],
IIF( IsNull(sum(sold.Qte)), "111" , Format( sum(sold.Qte),"00.00") ) as [Quantite Vendu],
Str(sum(stock.QteEntree) - sum(sold.Qte))+" "+a.unit as [Quantite Existe]
from Article a
left join stock on a.IdArt = stock.IdArt
left join sold on a.IdArt = sold.IdArt
group by a.IdArt, a.Nom, a.Prix, a.unit
你可能需要調整一下
實際上,我更願意從上面寫下這句話:
IIF( IsNull(sum(sold.Qte)), "111" , Format( sum(sold.Qte),"00.00") ) as [Quantite Vendu],
改為:
Format( sum( IIF( IsNull( sold.Qte ) , 0, sold.Qte ) ), "00.00" ) as [Quantite Vendu],
Againt,我不是100%肯定會工作,我只是看看你的功能的順序和邏輯
確定找到了解決方案:
iif( isnull((select sum(QteEntree) from Stock where IdArt = a.IdArt group by IdArt)) ,0, (select sum(QteEntree) from Stock where IdArt = a.IdArt group by IdArt) )
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