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Solved remove all primary keys from SQL Table

Posted on 2014-12-23
Medium Priority
Last Modified: 2014-12-29

What code would I use to remove all the primary keys from a SQL table?

Question by:Murray Brown
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LVL 35

Expert Comment

ID: 40515167
You would include SQL Server Management Objects in your references and use the IndexCollection to find all indices which are primary keys. Then you may be able to delete them as long as no foreign key relationship exists.

Something like
foreach (Table table in database.Tables)
    Index primaryKey = table.Indexes
		.FirstOrDefault(index => index.IndexKeyType == IndexKeyType.DriPrimaryKey);
    if (primaryKey != null)

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LVL 70

Expert Comment

by:Scott Pletcher
ID: 40515221
A given table could have only one primary key, so you don't need to worry about any kind of looping or multiple entries.
LVL 35

Expert Comment

ID: 40515262
hmm, need new glasses. I really read tables..(
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Author Comment

by:Murray Brown
ID: 40516300
I use the following code to add the keys. What similar code would I use to remove them
          Dim oSQL As String
            oSQL = "ALTER TABLE " & oTable
            oSQL = oSQL & " ADD CONSTRAINT pk_" & oTable & " PRIMARY KEY ([" & oColumn1 & "], [" & oColumn2 & "])"
            'oSQL = oSQL & " GO"
            Dim cn As New SqlConnection(Globals.ThisAddIn.oRIGHT.lblConnectionString.Text)
            Dim cmd As New SqlCommand(oSQL, cn)
LVL 75

Accepted Solution

Anthony Perkins earned 2000 total points
ID: 40521004
I would change:
 oSQL = oSQL & " ADD CONSTRAINT pk_" & oTable & " PRIMARY KEY ([" & oColumn1 & "], [" & oColumn2 & "])"
oSQL = oSQL & " DROP CONSTRAINT pk_" & oTable

Author Closing Comment

by:Murray Brown
ID: 40521894

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