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Let's count beans like a math nerd with a penchant for computers

E.F. Codd's relational database management system.

Lots of relational algebra mumbo-jumbo with Greek letters. Caveperson alternative is the Structured Query Language (SQL):

create table reservations (
      flight_number    integer,
      departure_time   datetime,
      passenger_name   string

-- how many folks are on one flight?
select count(*)
from reservations
where flight_number = 37
and departure_time = '2003-02-21 15:00'
Some problems: