Tetragrade

Commie-site keys??? LIBERAL!!! GUT IT!

Nah, they are supposed to be unique. If it was that it'd at least be a design choice potentially worthy of criticism. But consider, who's more likely to have fucked up a database task: Musk? Or the designer, someone with a degree (a real degree) on this topic?

Don't worry: since he's so big on transparency, I'm sure he'll release the schema so we can check his work... 🙄

Sounds like he got confused looking at a view of a join.

SELECT holder_name, amount
FROM account JOIN transaction ON transaction.account_id=account.id;

-- WTF!! THERE'S DUPLICATES!!!