Hi,

> If I change a varchar size from 15 to 11, for example, and
> there´re some rows containing up to 15 positions,
> what happens with this ones?

You cannot do this. Firebird only excepts enlarging a column.

With regards,

Martijn Tonies
Database Workbench - developer tool for InterBase, Firebird, MySQL & MS SQL
Server.
Upscene Productions
http://www.upscene.com