How to Add Column To Existing SQL Server Table with Default Constrain - SQL Server Tutorial

How to Add a Column with Values to Existing SQL Server Table - TSQL Tutorial / SQL Server Tutorial
We often have to add a new column to existing Table/s. Let's consider we have dbo.Customer table and we are US based company and we never did business outside USA. so we never need Country Column to our existing Table for Address as we only operator in USA. Now company has decided to expand the business and might have the customers from other countries. What we want to do , we want to add column to existing table with default value. All the existing values should be also updated to default value when we add this new column. Moving forward if no Country Name provided, It should take USA otherwise value provided.

blog post link for script
http://sqlage.blogspot.com/2015/03/ho...