Database Tables without Relationships in the Schema

Is this common? In our database we have ~32% of all tables are standalone with no relationship. Some are part of an ETL which would explain why they aren't related, but still that's a lot! This is a data warehouse environment with some transactions going on. Is this common?

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NotHackingYou

Yes, it is common.

NightShade03

Yes it is common. You'll also find that during ETL certain values need to be combined leading to tables like this (often called a contingency table -> Contingency table - Wikipedia, the free encyclopedia).

Depending on the platform and DW tools in use I've seen many of these tables usually stored in a caching server like Redis, or a NoSQL platform. Sometimes ACID compliant platforms are used because that is were the expertise within the organization lies.

N2IT

SSMS 2008 Yeah I am seeing a lot of tables not hard related it's confusing to say the least. I found some nice sys tables that can provide a ton of information, basically building a data dictionary.