> print(dm())
dm()

> nyc_flights_dm <- dm_nycflights13(cycle = TRUE)
> nyc_flights_dm
-- Metadata --------------------------------------------------------------------
Tables: `airlines`, `airports`, `flights`, `planes`, `weather`
Columns: 53
Primary keys: 3
Foreign keys: 4

> nyc_flights_dm %>% format()
dm: 5 tables, 53 columns, 3 primary keys, 4 foreign keys

> nyc_flights_dm %>% dm_filter(flights, origin == "EWR")
-- Metadata --------------------------------------------------------------------
Tables: `airlines`, `airports`, `flights`, `planes`, `weather`
Columns: 53
Primary keys: 3
Foreign keys: 4
-- Filters ---------------------------------------------------------------------
flights: origin == "EWR"

