Can you write out the SQL expression for this and give an explanation?:

Write the code to:

Display the number of clients each instructor has for the rumba and tango lessons. Show the

instructor's name $($instructor$),$ then the dance name $($dance$),$ then the number of clients

$($numberofclients$)$ only if the instructor has at least $15$ clients but not more than $30($between$).$

Store the result in rumba$\_$tango$\_$clients$\_$by$\_$instructor.