This is a classic example of why you should include a database schema as part of your release (but not globally accessible as that a security risk).

There are various pieces of software that can generate schemas one of the better and cheaper is Dezign for Databases.
For simple to use, generates DDL schemas for large variety of databases, can reverse engineer schemas from source or database connections.
Against only available for windows, cost varies between $230 and $700 depending on version.

Used this on a number of projects, especially useful when the coder never documented his database and just let it evolve.

Hope it helps
UnderMine