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Re:How SQL Database Engines Work, by the Creator of SQLite (... by _wmd on Sunday June 24, 2018 @09:08PM (#17389277)
this video is a 100ft overview, original link is about SQL internals
Re:How SQL Database Engines Work, by the Creator of SQLite (... by netgusto on Monday June 25, 2018 @04:32AM (#17390826)
Detailed explanations start at 26m40s:

https://youtu.be/gpxnbly9bz4?t=26m40s