A good introduction on why people should use a proper RDBMS over one that just wins some benchmarks.
Strongly suggest adding some comparison slides between the engines (side-by-side).
Same old stuff as last time: we want more stuff, work harder!
J/K: this was awesome and you managed to pack in an additional load of examples.
One tip: try highlighting query scheduler output, don't auto-cast NULL to string in output examples (add a slide?)
Great talk on the little differences between MySQL and PostgreSQL.