question: Find the distinct student first names of all students that have grade point at least 3.8 in one course.
#1 return students 
#2 return grade points of #1 
#3 return #2 that are at least 3.8 
#4 return number of  #3 for each #1 
#5 return #1 where #4 is one 
#6 return distinct first names of #5