Similar example and simplier explanation for noobs. :) Was on HN yesterday. https://periscope.io/blog/use-subqueries-to-count-distinct-50x-faster.html https://

Similar example and simplier explanation for noobs. :) Was on HN yesterday. https://periscope.io/blog/use-subqueries-to-count-distinct-50x-faster.html https://periscope.io/blog/use-subqueries-to-count-distinct-5...