Consider the following table:
CREATE TABLE invoice (
account_id integer NOT NULL REFERENCES account,
invoice_number integer NOT NULL,
UNIQUE (account_id,invoice_number));
I would like to do the equivalent of making invoice_number a serial type, but
on a per-account basis. Would it be a reasonable approach to create a separate
sequence for each individual account? Are there performance implications I
should know about, given that there will be hundreds of thousands of accounts?
Is there another approach I should be looking at instead?
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