Adding an identity to an existing column

Question

I need to change the primary key of a table to an identity column, and there\'s already a number of rows in table.

I\'ve got a script to clean up the IDs to ensure

Answer 1

To modify the identity properties for a column:

• In Server Explorer, right-click the table with identity properties you want to modify and click Open Table Definition. The table opens in Table Designer.
• Clear the Allow nulls check box for the column you want to change.
• In the Column Properties tab, expand the Identity Specification property.
• Click the grid cell for the Is Identity child property and choose Yes from the drop-down list.
• Type a value in the Identity Seed cell. This value will be assigned to the first row in the table. The value 1 will be assigned by default.

That's it, and it worked for me