Then learn what sequence of actions your data store(s) takes based on that SQL. Relational engines are great but can need tuning (add indexes, de/normailze, mat

Then learn what sequence of actions your data store(s) takes based on that SQL. Relational engines are great but can need tuning (add indexes, de/normailze, materialized views or not) and then key/value ones are going to be doing scans from the entire cluster generally unless you get the cluster key in there and ideally the primary key too.