function help ???

From: Andrea Oracle <andreaoracle_at_yahoo.com>
Date: Mon, 03 Dec 2001 09:29:55 -0800
Message-ID: <F001.003D36DE.20011203091135@fatcity.com>

Hi, Could any one show me how to write the following function? Thank you very, very much!

The GPA Function

1. A GPA is calculated in the following fashion: Assume a student receives an A on a 3-credit_hour course and a D on a 2-credit-hour course. His grade is (4*3+1*2)/(3+2)=2.8.

2.Repeat_delete Policy: A student may repeat a course as many times as he
wants. However, if the first grade he receives on this course is a D or F,
then the second grade will automatically replaces the first grade, and the
first enrollment will not go into his GPA calculation. Under any other
circumstances, his grades will be considered as a regular grade and be
taken into consideration for GPA.

create table Enrollment(
Student# NUMBER (7),
SNUM NUMBER (5),
Call# NUMBER (7),
Semester char (8),
GRADE char (3),
Credit number,
Withdraw_Date Date);

SNUM + Call# represents one class.

 Insert into Enrollment
values('58001','111','70070','Sp2000','F',3, null); Insert into Enrollment
values('58001','111','70070','Fa2000','B',3, null); Insert into Enrollment
values('58003','222','70070','Sp2000','A',2, null); Insert into Enrollment
values('58004','333','80025','Fa2000','A',2, null); Insert into Enrollment
values('58005','222','80025','Fa2000','C',3, null);

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Author: Andrea Oracle
  INET: andreaoracle_at_yahoo.com

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