This database (https://github.com/Microsoft/sql-server-samples/releases/tag/wide-world-importers-v1.0) is the latest one and fully compatible with all features in SQL Server 2016 and beyond, and it is the most complex. If you are planning to learn or develop your SQL skills, I highly recommend not starting with WideWordlImporters until you have sufficient knowledge about SQL Server specific features, such as temporal tables, in-memory OLTP, data masking, and so on.
This database contains a lot of useful gems, just waiting to be explored, and based on the examples, implemented inside your own projects. The following diagram, Figure 5-4, only illustrates one small part of the database:
Figure 5-4. WideWordlImporters locations section
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BuyingGroups BuyingGroups_Archive Cities Cities_Archive...