Find difference between two database and output them in a script sql

I had a SQL Server 2008 R2 database. I have dump it and made some mods in a copy.

So, I have two databases:

1) the older version 2) the new version

I need a script SQL to update the number 1) to the number 2) (an update).

Does it exist some tools or similar to make this? Or have I to write the script on myself?

EXAMPLE:

Two simply databases, with only one table.

DBOLD.TABLE1: ID, NAME

DBNEW.TABLE1: ID, IDFK, DESCRIPTION

In this case, I'd need a script to add IDFK and DESCRIPTION and drop NAME.

I hope my goal is clear to you.