Where can I find ready-to-use database models ?
I don't need a database with data in it, but only schemas (UML diagrams). Perhaps something like the data models at this link, but much more complex and real world.
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David Hay's Enterprise Model Patterns (and his earlier ones). This is a beast of a book, but has some great patterns.
Len Silverston's Data Model Resource Book Vols. 1,2,3. Good case studies by industry in the last 2 books.
Michael Blaha's Patterns of Data Modeling. This one has some interesting temporal, graph, and tree models.
Martin Fowler's Analysis Patterns. This one skims some of the other patterns, but gives accounting a solid treatment.
They are all well-rated and I have read them and they are all very good.
Also, OASIS's Universal Business Language schemas (xml)
What are you trying to do anyway?