Is there a tool that generates visual graphs from a relational database?

In order to better visualize the relationships in a complex database, I'd like to create a graph/chart that shows the tables, and their relationships. Hibernate was used to create the database, and I have access to both the x.cfg.xml file and a Create schema.

Is there a tool that reads in SQL and creates a graph for visual analysis? Are there other means than drawing it by hand?

From stackoverflow

• There is a tool I use sometimes called DbVisualizer which is very helpful for doing exactly what you're looking for. I've used it primarily with PostgreSQL but it's supposed to support most major databases.

• If you're just looking for entity-relationship diagramming software that can reverse engineer an existing MYSQL database, give MySQL Workbench a look. The reverse engineering capabilities require the paid version but it's worth it with large databases.

• I've actually enjoyed using the table visualizer in Microsoft SQL Server Enterprise Manager. You didn't specify what flavor of SQL you prefer, so I thought I'd mention it in case it might be useful.

  For MySQL, I believe MySQL Workbench might be a useful tool.

• If you are looking for a opensoure solution you may also take a look at DBDesigner from fabForce.net.

• You can check this query tool, its still Beta so its free.

  From the product's site : ..

  Data tables are not always islands. Many times they relate to one another. Marie-Alix enables you to define relationships between tables, and then view the data accordingly...."

• I've used TOAD to do this in the past, works great with Oracle and SQL Server. All sorts of visualization tools included, and one of the better sql client interfaces.