In my last job, each till transaction required a unique number, because all sales where collected from the tills databases and stored in main server database.
The problem was when you had independent tills in a couple of branches, how do you generate unique numbers.
Our final solution was to use the date and time, prefixed by the branch and till id. EG: 0123320061008160000
If you need more than one record per second, you can add milliseconds to the transaction ID.
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