Use value of a column for another column (SQL Server)?

Question

lets say I have a huge select on a certain table. One value for a column is calculated with complex logc and its called ColumnA. Now, for another column, I need the val

Answer 1

You could:

1. Do the + 10 in the client code
2. Write a scalar-valued function to encapsulate the logic for complex stuff. It will be optimized into a single call.
3. Copy complex stuff logic for the other column. It should get optimized out into 1 call.
4. Use a sub-select to apply the additional calculation