common problem is to determine either the ancestors or descendants of
a given node represented by a row in a database table.
often involve exploding out for a given row, all descendants. Using
plain SQL, this involves numerous queries and round-trips to the
database to traverse the parent identifiers or child identifiers.
Such recursive operations can degrade performance since
numerous network round-trips are involved. This
problem frequently manifests in businesses that require a “Bill of
Materials” tree... [More]