A nice addition to your database collection is Microsoft’s Contoso (BI):
The Contoso BI Demo dataset is used to demonstrate DW/BI functionalities across the entire Microsoft Office product family. This dataset includes C-level, sales/marketing, IT, and common finance scenarios for the retail industry and support map integration. In addition, this dataset offers large volumes of transactions from OLTP and well-structured aggregations from OLAP, along with reference and dimension data.
Download the Microsoft Contoso BI Demo Dataset for Retail Industry here.