How would I do this Urgent

Im storing information in a talble (Invoice), and at
the end; the table is generating a number(Invoice #).
ie im trying to generate an invoice # which is
unique. I know how to save the info, but my problem is
how to retrieve this number. Is there a way to read the
Invoice # column prior to closing.
Thank u for your time

How do u get the unique value for that column?
Generally we de couple these two
generation of unique number (either by sequence generator ect)
Inserting it
so u have the value before even inserting.

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