mid problem in access 2003
 

Hi everybody....I am having a very strange problem with an update query....I need to make a new field equal to a part of two other fields. For that I use the Mid function like this:

Medio(Tabla2![Start Time],1,2)

In mi Pc doesn´t work but it does in others!!!!I get an unvalid syntax error :cry: and I have proven everything, I think! Please help me!!! Mi pc has windows XP OS and I am working with Access 2003