How to do an update across two bases ? by lignumaqua - 2013-11-18

It's not that UPDATE doesn't support JOIN, it's that UPDATE doesn't support 'FROM'

Try something like (untested, you might need to mess with the names):

SQL

UPDATE Caches as New SET User2=(SELECT User2 FROM Base.Caches WHERE New.Code=Base.Caches.Code), User3=(SELECT User3 FROM Base.Caches WHERE New.Code=Base.Caches.Code), User4=(SELECT User4 FROM Base.Caches WHERE New.Code=Base.Caches.Code) WHERE EXISTS (SELECT * FROM Base.Caches WHERE New.Code=Base.Caches.Code)