<t>Make sure that the Key column's datatype is int and then setting identity manually, as image shows<br/>
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Or just run this code utilizing IDENTITY(seed, increment) modifier<br/>
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-- ID is the name of the [to be] identity column<br/>
ALTER TABLE [yourTable] DROP COLUMN ID <br/>
ALTER TABLE [yourTable] ADD ID INT IDENTITY(1,1)<br/>
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```<br/>
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the code will run, if `ID` is not the only column in the table<br/>
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*image reference fifo's*</t>
