Is there a good SQL Diagram Editor/Drawing Mac App Tool?

Does anyone know a comprehensive Mac app to create SQL Diagramms? I think http://ondras.zarovi.cz/sql/demo/ is quite good, but it's a little bit too basic. I would like to create the database schema, the relations between the tables (including labels for e.g. n:m relations), add comments, export to SQL, and so on to run from my Mac.