Simple typo. Internet and real life are very different once you remove algorithmic driven social media feeds.
23 karma · joined October 10, 2020
Example:
select * from customers c inner join orders o on o.order_id = c.customer_id
Legal syntax but clearly incorrect.
[1] https://books.google.co.uk/books?id=t9ZQAAAAMAAJ&source=gbs_...