Which Default Schema

Script to Set the SQL Server Database Default Schema For All Users

You may come across or even inherit a system where many of the users have different default schemas. Usually, this is easy to remedy - you go into Management Studio, right-click the user, and change the default schema through the UI. Or you write an ALTER USER command manually. But what if you have hundreds of users, across all of your user databases, that should all have the same default schema?