>What things does ERWIN allow you to do that SQL does not provide?

PMFJI, but I'm not sure what you mean with this question.

Erwin is a graphical data modeling tool. You can build your database graphically (PKs, FKs, RI) and then have Erwin generate the SQL scripts for you to run later or actually connect to the back-end and do it immediately.

Erwin can be used with most back-ends (e.g. SQL Server, Oracle, Sybase, DB2) and some local data engines (e.g. Access, FoxPro).

It's distributed by Platinum Software (www.platinum.com).

HTH.