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i have a primary key field -- but how do i update the field so that it is is an identity column that increments by one every time something is inserted

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Last Modified: 2015-12-16
i have a primary key field -- but how do i update the field so that it is is an identity column that increments by one every time something is inserted.

It is an existing table so i believe I have to use alter table but not sure of all the syntax
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