Creating a computed column in SQL Server 2008


I have a SQL Server 2008 database. This database has a Table called "Book". "Book" has the following properties:

  • ID (int)
  • Title (nvarchar(256))
  • PublishDate (datetime)

I need to create a computed column called "AgeInMinutes". I'm not very familiar with computed columns. I understand the concept, but I'm not sure how to do it. In SQL Server Management studio, in the "Column Properties" area, I see a property called "(Formula)" in the Table Designer section. I assume I need to enter my calculation here. However, I'm not sure what to put here. Can somebody please help me?

Thank you!

Best Solution

You can define the column in your CREATE TABLE as:

AgeInMinutes as (DATEDIFF(minute, PublishDate, GETDATE())

Alternatively, just do

ADD AgeInMinutes as (DATEDIFF(minute, PublishDate, GETDATE())