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The government doesn't use SQL
(programming.dev)
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Also that's not how deduplication works.
He means/thinks that SSN is not unique (which is not a problem, just different design).
Of course he's wrong about lots of stuff, just the nerd in me could not not explain it.
I imagine he’s looking at a payments table where there is a non-unique key to relate a citizen to each payment.
Yeah, I was thinking something similar. I'm not a DBA but it's the easiest way (that I can think of) to record all transactions for a certain user.