not quite.
what the above code does is links the point ON the id in alphabet table.
Point can be any number ie see below.
OrderID Point
Order1 4
Order2 12
Order3 12
Order4 12
Order5 29
Order6 31
Order7 49
I have ordered the list by Point. therefore it starts with A and checks if there is another equal Point, if so then assign A, else B, checks if theres another Point equal to B, and so on, like below:
OrderID Point LetterCode
Order1 4 A
Order2 12 B
Order3 12 B
Order4 12 B
Order5 29 C
Order6 31 D
Order7 49 E