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VB.net SQL set three columns as the primary key in am existing table

Posted on 2014-12-23
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Last Modified: 2014-12-23
Hi

What VB.net code would I use to add a composite primary key  to an existing SQL table, which
includes three of the columns

Thanks
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Question by:murbro
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Expert Comment

by:Jesus Rodriguez
ID: 40515063
You can alter your table and if you now your columns is only running a query like

ALTER TABLE dbo.Your_Table
ADD CONSTRAINT PK_Your_Table 
PRIMARY KEY (COL1, COL2) 

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Accepted Solution

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Jesus Rodriguez earned 500 total points
ID: 40515065
On VB.NET
        Dim cmd As New SqlCommand
        Dim Cnx As SqlConnection = New SqlConnection("Your connection  String")
        With cmd
            .Connection = Cnx
            .CommandText = "ALTER TABLE dbo.Your_Table ADD CONSTRAINT PK_Your_Table PRIMARY KEY (COL1, COL2,COL3)"
            .CommandType = CommandType.Text
            Cnx.Open()
            Try
                cmd.ExecuteNonQuery()
            Catch ex As Exception

            End Try
            Cnx.Close()
        End With

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Author Closing Comment

by:murbro
ID: 40515133
Great. Thanks very much
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