How to set a Primary Key for a column in SharePoint 2010

• Login to your SharePoint 2010 site with Administrator Credentials.
• Go to your specific list.
• On Ribbon Click on List Tab.
• In List Tab Click on List Settings.
• Go to column you want to make it as a Primary Key.
• Click on that column.
• Now in that column you will find Enforce Unique Values.
• Select Yes option for Enforce Unique Values and press OK.
• Now the respective column will be set as Primary Key.