query: SELECT COUNT(DISTINCT StuID) FROM ENROLLED_IN WHERE Grade  =  "B"
question: Of students that have at least one grade " B " Find number.
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: Of students that have at least one grade " B " Find number.