relationships between the entities and cardinality.

Q$4\backslash$SQL to RA & tree:

retrieve professor who has credit hours more the $4$ along with name &

represent it into tree.

Bb$\_$Lectured $($ Lecture$\_$id$,$ credits, Lectured$\_$by$,)$

Professor $($Emp$\_$id$,$ name, $,)$

tree: