SchemaSpy is a Java-based tool that analyzes the metadata of a schema in a database and generates a visual representation of it in a browser-displayable format.
It lets you click through the hierarchy of database tables via child and parent table
... [More] relationships.
The browsing through relationships can occur though HTML links and/or though the graphical representation of the relationships.
It's also designed to help resolve the obtuse errors that a database sometimes gives related to failures due to constraints. [Less]