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https://rosreestr.ru/wps/portal/cc_ib_opendata
https://habrahabr.ru/company/infoculture/blog/201892/
In general, the "Open Data" query can produce very interesting data, based on which you can already make queries and optimize them .
PS: At the same time, conversion and error handling can be worked out, since these databases are most often in the form of raw data and records in them may be "broken" or incomplete.
Grab the AdventureWorks demo database directly from Mircrosoft. It (the database) is deliberately designed with errors so that you can practice on it.
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