I have imported data from Excel into MS SQL Server 2012 Express. All of the records have IDs already assigned to them. My task was and is to take the Excel data and normalize it into various tables and basically build a database. I went about this by breaking out the data into Excel sheets and manually assigning IDs to related the data together. Now that I am finished with that process I am ready to import into MS SQL Server, but I see that what I intended to be the Primary Key for each table, I cannot set the Is Identity = Yes attribute. Is that because there is already data in the table? Is there a way to do this? What is your advice for me? I suppose I could just add a new column to each table once imported and make it the Primary Key and set Identity = Yes, but I don't know if that's they best answer.