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trying to develop a system to assign grades to students. The system reads marks from my database, and assigns a grade after getting average of scores.
Used case statements, keep throwing errors. So i tried if statements but its giving me issues. Someone know a better way to do it?

delimiter //

create function assign_grade(v_idnumber int)
returns varchar(50) deterministic
begin

  declare v_marks1 varchar(50);
  declare v_marks2 varchar(20);
  declare phyz varchar(50);
  declare Chem varchar(50);
  declare grade varchar(50);



  set phyz = (select Physics from marks where Sid=v_idnumber);
  set Chem=(select Chemistry from marks where Sid=v_idnumber);

  if(phyz>Chem)
  begin
   set v_marks1=(select(English+Kisw+Math+Physics+Bio+Business+Geog+Cre)/8 from marks where Sid=v_idnumber);

   if (v_marks1>= 80 && v_marks1<=100) then
            set grade ='A'; 
                else if (v_marks1>=60&& v_marks1<=79) 
                    set grade='B';
                else if (v_marks1>=40&& v_marks1<=59)
                    set grade ='C';
                else if (v_marks1>=30&& v_marks1<=49)
                    set grade ='D';
                else if (v_marks1>=0&& v_marks1<=29)
                   set grade ='E';  
                else
                    set grade = 'Failed Miserably';

             end if
             end if
             end if
             end if
             end if

             return grade;

    end;

     if(Chem>phyz)
           begin
            set v_marks2=(select(English+Kisw+Math+Chemistry+Bio+Business+Geog+Cre)/8 from marks where Sid=v_idnumber);
       if (v_marks2>= 80 && v_marks2<=100) then
            set grade ='A'; 
                else if (v_marks2>=60&& v_marks2<=79) 
                    set grade='B';
                else if (v_marks2=40&& v_marks2<=59)
                    set grade ='C';
                else if (v_marks2>=30&& v_marks2<=49)
                    set grade ='D';
                else if (v_marks2>=0&& v_marks2<=29)
                   set grade ='E';  
                else
                    set grade = 'Failed Miserably';

             end if
             end if
             end if
             end if
             end if

             end;

             return grade;



  //
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Last Post by Taywin
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Why do you have so many 'end if' for each if - else if - else statement??? Also, where is the 'end if' for if(phyz>Chem) or if(Chem>phyz)?

Edited by Taywin

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