Question: What is the difference in an INNER JOIN and a FULL OUTER JOIN? Full outer join is not a real thing in SOL Full outer

What is the difference in an INNER JOIN and a FULL OUTER JOIN?
Full outer join is not a real thing in SOL
Full outer join returns tuples even if they do not have a matching tuple in the other relation
Full outer join requires union compatibility, where inner join does not
Full outer join returns tuples based on inequality, rather than equality

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