DCountとSQL SELECT COUNT（*）の比較

Question

私は、割り当てられた注文書に基づいてサプライヤーに送られたすべてのアイテムの数を取得しようとしています。しかし、注文書インスタンスに基づいていくつかの項目を表示するコントロールを得ることができないようです - #nameのどちらかを投げ続けますか？または#error！フォームがアクティブになると、テキストボックスにメッセージが表示されます。

tblPOGaugeDetail

のための文

USE [instkeeper_test] 
GO 


SET ANSI_NULLS ON 
GO 

SET QUOTED_IDENTIFIER ON 
GO 

CREATE TABLE [dbo].[tblPOGaugeDetail](
    [intItemPOID] [int] IDENTITY(1,1) NOT NULL, 
    [intGagePOID] [int] NOT NULL, 
    [strGageDetailID] [nvarchar](50) NULL, 
    [datGageSent] [datetime] NULL, 
    [datGageReceived] [datetime] NULL, 
    [bolGageCalibrate] [bit] NOT NULL, 
    [bolGageRepair] [bit] NOT NULL, 
    [bolGageEvaluate] [bit] NOT NULL, 
    [bolGageAccredited] [bit] NOT NULL, 
    [bolGageReturned] [bit] NOT NULL, 
    [bolGageException] [bit] NOT NULL, 
    [bolGageExceptResolved] [bit] NOT NULL, 
    [bolGageLeavePriceBlank] [bit] NOT NULL, 
    [intGageCost] [real] NULL, 
    [intTurnaroundDaysOut] [int] NULL, 
    [SSMA_TimeStamp] [timestamp] NOT NULL, 
CONSTRAINT [tblPOGaugeDetail$PrimaryKey] PRIMARY KEY CLUSTERED 
(
    [intItemPOID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] WITH CHECK ADD CONSTRAINT [tblPOGaugeDetail$tblPODetailtblPOGaugeDetail] FOREIGN KEY([intGagePOID]) 
REFERENCES [dbo].[tblPODetail] ([intPurchaseOrderInstance]) 
ON UPDATE CASCADE 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] CHECK CONSTRAINT [tblPOGaugeDetail$tblPODetailtblPOGaugeDetail] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [intGagePOID] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((1)) FOR [bolGageCalibrate] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageRepair] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageEvaluate] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageAccredited] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageReturned] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageException] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageExceptResolved] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [bolGageLeavePriceBlank] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [intGageCost] 
GO 

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD DEFAULT ((0)) FOR [intTurnaroundDaysOut] 
GO 

私は数が

SELECT dbo_tblPODetail.intPurchaseOrderInstance, dbo_tblPODetail.strSupplierCode, dbo_tblPODetail.bolPOOpen, dbo_tblPODetail.intPONumber, dbo_tblPODetail.datDateSent 
FROM dbo_tblPODetail 
WHERE (((dbo_tblPODetail.bolPOOpen)=True)) 
ORDER BY dbo_tblPODetail.datDateSent; 

に表示したいという購入注文の詳細を照会文を作成しますtblPODetail

USE [instkeeper_test] 
GO 


SET ANSI_NULLS ON 
GO 

SET QUOTED_IDENTIFIER ON 
GO 

CREATE TABLE [dbo].[tblPODetail](
    [intPurchaseOrderInstance] [int] IDENTITY(1,1) NOT NULL, 
    [intPONumber] [int] NOT NULL, 
    [datDateEntered] [datetime] NOT NULL, 
    [bolPOOpen] [bit] NOT NULL, 
    [intRMANumber] [nvarchar](255) NULL, 
    [strSupplierCode] [nvarchar](50) NOT NULL, 
    [strSupplierLastAddress] [nvarchar](50) NULL, 
    [strSupplierLastCity] [nvarchar](50) NULL, 
    [strSupplierLastState] [nvarchar](50) NULL, 
    [strSupplierLastPostalCode] [nvarchar](50) NULL, 
    [strSupplierLastCountry] [nvarchar](50) NULL, 
    [strSupplierLastPhone] [nvarchar](50) NULL, 
    [strSupplierLastFax] [nvarchar](50) NULL, 
    [datDateSent] [datetime] NULL, 
    [datDateReceived] [datetime] NULL, 
    [bolAdvGageTrakNoTouch] [bit] NOT NULL, 
    [bolAdvHardCopies] [bit] NOT NULL, 
    [bolFreightShip] [bit] NOT NULL, 
    [bolReturnableUsed] [bit] NOT NULL, 
    [bolInHouse] [bit] NOT NULL, 
    [strUPSTrackNumOut] [nvarchar](255) NULL, 
    [strFedExTrackNumOut] [nvarchar](255) NULL, 
    [strFreightTrackNumOut] [nvarchar](255) NULL, 
    [strUPSTrackNumIn] [nvarchar](255) NULL, 
    [strFedExTrackNumIn] [nvarchar](255) NULL, 
    [strFreightTrackNumIn] [nvarchar](255) NULL, 
    [SSMA_TimeStamp] [timestamp] NOT NULL 
) ON [PRIMARY] 

GO 

ALTER TABLE [dbo].[tblPODetail] WITH CHECK ADD CONSTRAINT [SSMA_CC$tblPODetail$strSupplierCode$disallow_zero_length] CHECK ((len([strSupplierCode])>(0))) 
GO 

ALTER TABLE [dbo].[tblPODetail] CHECK CONSTRAINT [SSMA_CC$tblPODetail$strSupplierCode$disallow_zero_length] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__intPO__6C190EBB] DEFAULT ((0)) FOR [intPONumber] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__datDa__6D0D32F4] DEFAULT (getdate()) FOR [datDateEntered] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolPO__6E01572D] DEFAULT ((1)) FOR [bolPOOpen] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolAd__6EF57B66] DEFAULT ((1)) FOR [bolAdvGageTrakNoTouch] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolAd__6FE99F9F] DEFAULT ((1)) FOR [bolAdvHardCopies] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolFr__70DDC3D8] DEFAULT ((0)) FOR [bolFreightShip] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolRe__71D1E811] DEFAULT ((0)) FOR [bolReturnableUsed] 
GO 

ALTER TABLE [dbo].[tblPODetail] ADD CONSTRAINT [DF__tblPODeta__bolIn__72C60C4A] DEFAULT ((0)) FOR [bolInHouse] 
GO 

のための文を作成し、私はしました私はDCount（）とSELECT COUNT（*）の両方で少し読んだので、ちょっと不満でした。彼らが働くことはできません。どんな助けでも大歓迎です！前もって感謝します！

- 編集2009年6月18日1542時間@ -

これは、現在のイベントでは、サブフォームのは、トリガされたとき、私はコードで使用しようとしたSELECT COUNTの例である：

SELECT COUNT(*) AS ItemsSent 
FROM [dbo_tblPOGaugeDetail] 
WHERE [dbo_tblPOGageDetail]![intGagePOID] = [dbo_tblPODetail]![intPurchaseOrderInstance] 

これは、サブフォームのコントロールに添付された= DCOUNTステートメントの例です。

=DCOUNT("*", "[dbo_tblPOGaugeDetail]", "[intGagePOID] = [Forms]![frmSupplierInfoMain]![subfrmOpenPOBySupplierID]![intPurchaseOrderInstance]") 

どちらも悲しいことです。

Answer 1

クエリはカウント（*）なしで機能しますか？

DCountの最初の引数に実際のフィールド名を使用します。 where文字列からコントロール名を取得します。

For DCOUNT("[intItemPOID],"[dbo_tblPOGaugeDetail]","[intGagePOID]=" & Forms]![frmSupplierInfoMain]![subfrmOpenPOBySupplierID]![intPurchaseOrderInstance])