SQL Queries to generate statistics 
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These assume that the exact same relational structure is used as was provided in this repository. 

The more involved queries also contain a few lines explaining their semantics in natural language. 

The queries have been tested and run using SQLite3, version 3.35.5.  Note that a custom function has to be provided to compute the standard deviation. The extension file to enable this in SQLite is included in this folder ("extension-functions.so"). 
