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I have a MySQL DB and I would like to generate its relational diagram. Is there a tool that can connect to the DB and automatically generate it for me?
Yes, DEVART's DBForge for MySQL will do this.
There is a free Express edition, I'm not sure it has this functionality, but have a look at: http://www.devart.com/dbforge/mysql/studio/
If you are a happy owner of IntelliJ IDEA Ultimate Edition, you can use its database tools. IDEA is able to connect to databases and build UML diagrams.