Adding Miller / mlr to the comparison

[Cyril Chaboisseau]

Could you also include miller/mlr to the list of tools?

Here is the command line to get the same result with pretty formatting:
mlr --icsv --opprint --barred stats1 -a count,mean -f total_amount -g passenger_count then sort -f passenger_count taxi.csv

[Phil Eaton]

Hmm maybe I'll make a separate list of things that aren't SQL. The rest of the tools are all SQL.