Venn diagrams are not very good at explaining SQL joins. CROSS JOIN, for example.
https://blog.jooq.org/say-no-to-venn-diagrams-when-explaining-joins/
this post was submitted on 02 Aug 2023
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The author does a good job explaining how join diagrams are more accurate than venn diagrams, but by saying that venn diagrams are bad and wrong, I feel like they completely miss the point. The venn diagrams can be understood almost instantly, whereas the join diagrams take time and thought to take in.
If someone was brand new to sql joins, sure maybe I would say a join diagram is better for them, so they can really understand what is happening. But for someone who just wants a refresher on join types they rarely use, I think the venn diagrams win. I guess ultimately I don't like the claim that one type of diagram is simply "better".
Hey…has anyone here ever seen a RIGHT JOIN in the wild?
When I see a RIGHT JOIN I just shake my head and wonder "Why?". That said, I can't remember the last time I saw one.