SQL Queries - Explanation Of Od

Oct 31, 2007

I am wondering what are od1 and od2 used for in SQL Queries? Are they used for joining... can anyone explain their significance in the queries below... (especially the commands in red)


USE Northwind
SELECT OrderID, CustomerID
FROM Orders o
WHERE 20 < (SELECT Quantity
FROM [Order Details] od
WHERE o.OrderID = od.OrderID AND od.ProductID = 23)USE Northwind
SELECT DISTINCT ProductName, Quantity
FROM [Order Details] od1 JOIN Products p
ON od1.ProductID = p.ProductID
WHERE Quantity = (SELECT MAX(Quantity)
FROM [Order Details] od2
WHERE od1.ProductID = od2.ProductID)

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Just An Explanation Of What This Means Please

Jan 22, 2008

Hi,
I have a project that has been given to me and need help please. The complete class is as follows
Public Class CarAccessData
    Public Function Getcarinfo() As List(Of CarInfo)
        Dim AllCarInfo As New List(Of CarInfo)
        Dim SQL As String        SQL = "SELECT [SKU], [CarMake], [CarModel], [Carprice]"
        Dim MyConnection As SqlConnection        MyConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("AntConnectionString1").ConnectionString)
        Dim aCmd As SqlCommand        aCmd = MyConnection.CreateCommand
        aCmd.CommandText = SQL        aCmd.CommandType = CommandType.Text
        Dim aDataReader As SqlDataReader
        Try
            MyConnection.Open()
            aDataReader = aCmd.ExecuteReader
            While aDataReader.Read()
                AllCarInfo.Add(New CarInfo(aDataReader))            End While
        Catch ex As Exception            Throw ex        Finally
            aDataReader.Close()
            MyConnection.Close()        End Try
        Return AllCarInfo    End Function
End Class
 
The bit I dont quite understand is the following snippet from above
 
 
Dim aCmd As SqlCommand        aCmd = MyConnection.CreateCommand
        aCmd.CommandText = SQL        aCmd.CommandType = CommandType.Text
        Dim aDataReader As SqlDataReader
        Try
            MyConnection.Open()
            aDataReader = aCmd.ExecuteReader
            While aDataReader.Read()
                AllCarInfo.Add(New CarInfo(aDataReader))            End While
        Catch ex As Exception            Throw ex        Finally
 
Can anyone explain this in real ABC style step by step please, just so I can start to understand this, ( I am quite new to this)
many thanks,
Anteater

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1.
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2.
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3.
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Ok, here is a asample table representing the problem more clearlyA | B | C | D-----------------a1 b1 c1 d1a1 b2 c2 d2a3 b3 c1 d3a4 b4 c4 d3a5 b5 c5 d5a6 b6 c6 d3Tha duplications are:row 1+2 in param Arow 1+3 in param Crow 3+4+6 in param Donly row 5 is unique in all parameters.conclusion: row 1+2+3+4+6 are the same usergoal: to find all duplicated rows & to delete them all accept oneinstance to leave.Note:Finding that row 1similar to 2 in A & deleting it will loose databecause we won't know that row 1 is ALSO similar to 3 on C & later onfinding that 3 is similar to 4 & 6 on D & so onThe simple time consuming (about 2 weaks) query to acomplish the taskis:SELECT count(*),A.B,C,DFROM tblGROUP BY A,B,C,DHAVING count(*)>1I THANK YOU ALL

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SearchChar = "P" ' Search for "P".
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My problem is this:

I need to scan within SearchString for blanks/spaces characters. When I
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I think this is how my code would read, but I am confused on how to place
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my search string would be SearchString = 'John Smith A'
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SearchChar = ' '
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<Folder xsi:type="SqlServerFolder">
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</TopLevelFolders>
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Stored Packages

+ File System
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Hello,



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Operating System XP Home SP2

SQL Server 2005 Express Edition with Advanced SP1 )



( idem for another workstation with XP Pro SP2 and same version of SQL Server 2005 Express



My problem is :

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Sorry for my poor english.

I shall appreciate any help about this problem

Have a nice day

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