Joinable implementation of SQL many-to-one relation
fromList : List ( comparable, a ) -> ManyToOne comparable a
The way to init the container from a list of pair
from : ManyToOne comparable a -> (List a -> result) -> Dict comparable result
Equivalent to SQL FROM
innerJoin : ManyToOne comparable a -> Dict comparable (List a -> result) -> Dict comparable result
Equivalent to SQL INNER JOIN
select : a -> a
Used for clarity only and match SQL queries