SELECT count(*) FROM Highschooler WHERE grade  =  9 OR grade  =  10
Count the number of high schoolers in grades 9 or 10.
SELECT count ( * ) FROM Highschooler WHERE grade = 9 OR grade = 10
select count ( * ) from highschooler where grade = value or grade = value
Count the number of high schoolers in grades 9 or 10 .