title: How to update a column (all rows) based on current value in SQL Server
body: <p>I have a table in SQL Server with a column called &quot;CreatedDate&quot; (type: DateTime). I want to update all records by adding 3 hours to existing value. All rows are created on a different DateTime.
  If a record was created at 07:33 then after running the query it should have value 10:33.</p>