Result sets are the encapsulated, database-specific results from an SQL query.

Two possible protocols for iterating over result sets exist:
Random access result sets
Sequential result sets

Query the number of rows or columns:

#rows ( result-set -- n )

#columns ( result-set -- n )

Traversing a result set:

advance-row ( result-set -- )

more-rows? ( result-set -- ? )

Pulling out a single row of results:

row-column ( result-set column -- obj )

row-column-typed ( result-set column -- sql )