How To Set SQL Primary Key To Auto Increment?

I just want to make the primary key so that it auto increments. Thanks

Code: .....

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I wan to ask isit can generate a primary key before to insert a new record from
asp to database (ms. access 2003). wat coding should i write for generate a primary key
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isit possible i genrate a primary at ASP pages before store/insert into the database?

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Let's say that someone trying to insert a record in the primary key which already exist...
it returns an error, and in fact that error:

Error Type:
Microsoft JET Database Engine (0x80004005)
The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again
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Code:
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sql=sql & " VALUES "
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conn.Execute sql

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Microsoft OLE DB Provider for ODBC Drivers (0x80040E14)
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/admin/Member_New-Sybase.asp, line 39

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