query: SELECT COUNT(DISTINCT StuID) FROM ENROLLED_IN WHERE Grade  =  "B"
question: How many students one a-had at least one "B" a grade?
query_toks: SELECT COUNT ( DISTINCT StuID ) FROM ENROLLED_IN WHERE Grade = `` B ''
query_toks_no_value: select count ( distinct stuid ) from enrolled_in where grade = value
question_toks: How many students one a-had at least one "B" a grade?