Add Default Value Of Datetime Field In SQL Server To A Timestamp

Answer :

For modifying an existing column in an existing table:

ALTER TABLE YourTable ADD CONSTRAINT DF_YourTable DEFAULT GETDATE() FOR YourColumn 

This can also be done through the SSMS GUI.

1. Put your table in design view (Right click on table in object explorer->Design)
2. Add a column to the table (or click on the column you want to update if it already exists)
3. In Column Properties, enter (getdate()) in Default Value or Binding field as pictured below

In that table in SQL Server, specify the default value of that column to be CURRENT_TIMESTAMP. The datatype of that column may be datetime or datetime2.

e.g.

Create Table Student (   Name varchar(50),   DateOfAddmission datetime default CURRENT_TIMESTAMP );