In a sense, Prolog _is_ a database query language. The base facts in Prolog are equivalent to the rows of a table. You can also ‘table’ predicates with variable

In a sense, Prolog _is_ a database query language. The base facts in Prolog are equivalent to the rows of a table. You can also ‘table’ predicates with variables (over a finite subset of values) by memoizing the results.