Question About SQL Query String

May 3, 2008

I am sorry for my basic question I am sure.  I have this SQL Query that attaches to 3 tables and pulls data in:

Select OffNormalInfo.OffNormalID, OffNormalInfo.CompanyID, OffNormalInfo.SiteID, OffNormalInfo.CaskID, DATEPART(mm,EventDate)as Month, DATEPART(dd,EventDate)as Day, DATEPART(yyyy,EventDate)as Year, EventName, Damage, Action, UnitIDVCC, UnitIDTSC FROM OffNormalInfo, DamageInfo, CaskInfo WHERE OffNormalInfo.OffNormalID = DamageInfo.OffNormalID and CaskInfo.CaskID = OffNormalInfo.CaskID

Now, the main table that has the main document that everything else rides off of is the OffNormalInfo table.  The CaskInfo table will also always have data in it, but there could be an instance where the DamageInfo table doesn't have a corrisponding record with the same OffNormalID as the OffNormalInfo table.

What is happening right now with this string is that nothing is being returned at all for that OffNormalInfo record if there is nothing in the DamageInfo table.  There are also many times that the DamageInfo table has multiple records with the OffNormalID and so it returns the entire row multiple times with the same info from the OffNormalInfo table - this is how it is designed and is working correctly.

So - the question.  How do I change my SQL to get it to still return everything in the OffNormalInfo table and CaskInfo table even when there is not a corresponding record in the DamageInfo table?  In this event I would like it to show the two columns (Damage and Action) with empty strings in the GridView.

Any thoughts would be appreciated.

Thanks!

Tim

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Hello to all,
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Hi all,
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USE [Northwind]

GO

/****** Object: StoredProcedure [dbo].[SalesByCategory] Script Date: 03/25/2008 08:31:09 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

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AS

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BEGIN

SELECT @OrdYear = '1998'

END

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FROM [Order Details] OD, Orders O, Products P, Categories C

WHERE OD.OrderID = O.OrderID

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AND P.CategoryID = C.CategoryID

AND C.CategoryName = @CategoryName

AND SUBSTRING(CONVERT(nvarchar(22), O.OrderDate, 111), 1, 4) = @OrdYear

GROUP BY ProductName

ORDER BY ProductName

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
From an ADO.NET 2.0 book, I copied the code of ConnectionPoolingForm to my VB 2005 Express. The following is part of the code:

Imports System.Collections.Generic

Imports System.ComponentModel

Imports System.Drawing

Imports System.Text

Imports System.Windows.Forms

Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.Common

Imports System.Diagnostics

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Dim _ProviderFactory As DbProviderFactory = SqlClientFactory.Instance

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' This call is required by the Windows Form Designer.

InitializeComponent()

' Add any initialization after the InitializeComponent() call.

'Force app to be available for SqlClient perf counting

Using cn As New SqlConnection()

End Using

InitializeMinSize()

InitializePerfCounters()

End Sub

Sub InitializeMinSize()

Me.MinimumSize = Me.Size

End Sub

Dim _SelectedConnection As DbConnection = Nothing

Sub lstConnections_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles lstConnections.SelectedIndexChanged

_SelectedConnection = DirectCast(lstConnections.SelectedItem, DbConnection)

EnableOrDisableButtons(_SelectedConnection)

End Sub

Sub DisableAllButtons()

btnAdd.Enabled = False

btnOpen.Enabled = False

btnQuery.Enabled = False

btnClose.Enabled = False

btnRemove.Enabled = False

btnClearPool.Enabled = False

btnClearAllPools.Enabled = False

End Sub

Sub EnableOrDisableButtons(ByVal cn As DbConnection)

btnAdd.Enabled = True

If cn Is Nothing Then

btnOpen.Enabled = False

btnQuery.Enabled = False

btnClose.Enabled = False

btnRemove.Enabled = False

btnClearPool.Enabled = False

Else

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btnOpen.Enabled = (connectionState = connectionState.Closed)

btnQuery.Enabled = (connectionState = connectionState.Open)

btnClose.Enabled = btnQuery.Enabled

btnRemove.Enabled = True

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btnClearPool.Enabled = True

End If

End If

btnClearAllPools.Enabled = True

End Sub

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Me.Cursor = Cursors.WaitCursor

DisableAllButtons()

End Sub

Sub EndWaitUI()

Me.Cursor = Cursors.Default

EnableOrDisableButtons(_SelectedConnection)

End Sub

Sub SetStatus(ByVal NewStatus As String)

RefreshPerfCounters()

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End Sub

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Return

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SetStatus("Ready")

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SetStatus("Operation cancelled")

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Dim strErrorMessage As String = ""

Dim strErrorCaption As String = "Connection attempt failed"

StartWaitUI()

Try

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lstConnections.SelectedIndex = lstConnections.Items.Add(cn)

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blnError = True

strErrorMessage = ex.Message

End Try

EndWaitUI()

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SetStatus(strErrorCaption)

MessageBox.Show(strErrorMessage, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

Else

SetStatus("Connection opened succesfully")

End If

End Sub

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StartWaitUI()

Try

_SelectedConnection.Open()

EnableOrDisableButtons(_SelectedConnection)

SetStatus("Connection opened succesfully")

EndWaitUI()

Catch ex As Exception

EndWaitUI()

Dim strErrorCaption As String = "Connection attempt failed"

SetStatus(strErrorCaption)

MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try

End Sub

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If queryDialog.ShowDialog() = System.Windows.Forms.DialogResult.OK Then

Me.Cursor = Cursors.WaitCursor

DisableAllButtons()

Try

Dim cmd As DbCommand = _SelectedConnection.CreateCommand()

cmd.CommandText = queryDialog.txtQuery.Text

Using rdr As DbDataReader = cmd.ExecuteReader()

If rdr.HasRows Then

Dim resultsForm As New QueryResultsForm()

resultsForm.ShowResults(cmd.CommandText, rdr)

SetStatus(String.Format("Query returned {0} row(s)", resultsForm.RowsReturned))

Else

SetStatus(String.Format("Query affected {0} row(s)", rdr.RecordsAffected))

End If

Me.Cursor = Cursors.Default

EnableOrDisableButtons(_SelectedConnection)

End Using

Catch ex As Exception

Me.Cursor = Cursors.Default

EnableOrDisableButtons(_SelectedConnection)

Dim strErrorCaption As String = "Query attempt failed"

SetStatus(strErrorCaption)

MessageBox.Show(ex.Message, strErrorCaption, MessageBoxButtons.OK, MessageBoxIcon.Error)

End Try

Else

SetStatus("Operation cancelled")

End If

End Sub
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
I executed the code successfully and I got a box which asked for "Enter the query string".
I typed in the following: EXEC dbo.SalesByCategory @Seafood. I got the following box: Query attempt failed. Must declare the scalar variable "@Seafood". I am learning how to enter the string for the "SQL query programed in the subQuery_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnQuery.Click" (see the code statements listed above). Please help and tell me what I missed and what I should put into the query string to get the information of the "Seafood" category out.

Thanks in advance,
Scott Chang

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Code Snippet




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(
[StudClassID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_ClassID] FOREIGN KEY([ClassID])
REFERENCES [dbo].[Classes] ([ClassID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_ClassID]
GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_CreditID] FOREIGN KEY([CreditID])
REFERENCES [dbo].[Credits] ([CreditID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_CreditID]
GO
ALTER TABLE [dbo].[Student_Classes] WITH CHECK ADD CONSTRAINT [FK_Student_Classes_StudentsID] FOREIGN KEY([StudentID])
REFERENCES [dbo].[Students] ([StudentID])
GO
ALTER TABLE [dbo].[Student_Classes] CHECK CONSTRAINT [FK_Student_Classes_StudentsID]

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[Prerequisites] Script Date: 03/31/2008 01:32:33 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Prerequisites](
[PrerequisiteID] [varchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[ClassID] [varchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
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(
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[ClassID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Prerequisites] WITH CHECK ADD CONSTRAINT [FK_Prerequisite_ClassID] FOREIGN KEY([ClassID])
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GO
ALTER TABLE [dbo].[Prerequisites] CHECK CONSTRAINT [FK_Prerequisite_ClassID]
GO
ALTER TABLE [dbo].[Prerequisites] WITH CHECK ADD CONSTRAINT [FK_Prerequisite_Prereq] FOREIGN KEY([PrerequisiteID])
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GO
ALTER TABLE [dbo].[Prerequisites] CHECK CONSTRAINT [FK_Prerequisite_Prereq]

USE [C:PROGRAM FILESMICROSOFT SQL SERVERMSSQL.1MSSQLDATACOLLEGE.MDF]
GO
/****** Object: Table [dbo].[Credits] Script Date: 03/31/2008 01:32:43 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
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[ClassID] [varchar](7) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
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)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Credits] WITH CHECK ADD CONSTRAINT [FK_Credits_ClassID] FOREIGN KEY([ClassID])
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GO
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ON c.ClassID = sClass.ClassID
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ON cred.CreditID = sClass.CreditID
WHERE sClass.StudentID = 0
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