Reference
Why the console's wall clock cannot settle any of this, and how this workshop's own reference figures were actually measured.
Every module in the learner track is a guided walkthrough -- the DDL, the queries, and the byte or row-count each one produces are already on the page, so there is no separate solution to look up here. This track holds the one thing that does not fit inside a single module: the measurement discipline behind every number the workshop quotes.