Create Classes Each Quarter and Calculate the GPA

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Oct 11, 2006
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I have two things I am trying to do: First, I want to create a database of each class a student took, with their grade and units. Secondly, I want to be able to calculate their GPA for all quarters they took.

How many tables do I need to create?
 
I created a table with ID, Student ID, Class, Quarter, Class Units, and Grade Points. There will be similiar student ID's, but the ID will be different with each entry. Therefore, how do I calculate the GPA of all of the classes of a single student?
 

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