What information do you have on professors who got a Ph.D.?
select * from professor where prof_high_degree = 'Ph.d.'
Also, combine that with information you have on professors with a Masters?
select * from professor where prof_high_degree = 'Ph.d.' or prof_high_degree = 'MA'
How many are there in total?
select count(*) from professor where prof_high_degree = 'Ph.d.' or prof_high_degree = 'MA'