A good algorithm for generating an order number

Question

As much as I like using GUIDs as the unique identifiers in my system, it is not very user-friendly for fields like an order number where a customer may have to repeat that to a

Answer 1

We do TTT-CCCCCC-1A-N1.

• T = Circuit type (D1E=DS1 EEL, D1U=DS1 UNE, etc.)
• C = 6 Digit Customer ID
• 1 = The customer's first location
• A = The first circuit (A=1, B=2, etc) at this location
• N = Order type (N=New, X=Disconnect, etc)
• 1 = The first order of this kind for this circuit