# Create a Invoice Number?

Question asked by keith.r on Jun 27, 2017
Latest reply on Jun 27, 2017 by keith.r

I'm working with a table from a in-house development POS system. This table is just a list of line items transactions without a way to relate records. I would like to synthesizing a Invoice Number for each record.

The available fields are:

Purchased Date

Serial Number (unique)

Customer ID (unique)

Product ID

Price

My first thought was to synthesize a Invoice Number based on the Purchased Date and Customer ID. Basically I added the values together:

Invoice Number = Customer ID + Year ( Purchased Date ) + Month ( Purchased Date ) + Day ( Purchased Date )

I was feeling smug until further review I noticed the Invoice Numbers wasn't unique for Purchased Date + Customer ID calculation.

Invoice Number 66481 = 1+7+2015 + 66458

Invoice Number 66481 = 2+13+2015 + 66451

Invoice Number 66481 = 3+27+2015 + 66436

Back to the drawing board. Hopefully someone with better understand can point me in the right direction.

TIA!