SELECT ; IIF(BETWEEN(nGrade, 90, 100), "A", ; IIF(BETWEEN(nGrade, 80, 89), "B", ; IIF(BETWEEN(nGrade, 70, 79, "C", "D")))) AS cLetterGrade, ; ....If you are SELECTing against an SQL database you will need:
cMySQL = [SELECT CASE ] + ; [WHEN nGrade BETWEEN 90 AND 100 THEN "A" ] + ; [WHEN nGrade BETWEEN 80 AND 89 THEN "B" ] + ; [WHEN nGrade BETWEEN 70 AND 79 THEN "C" ] + ; [ELSE "D" END AS cLetterGrade ] + ; [...]