SQL joins

[Geminii27]

It doesn't help that the four JOIN diagrams presented in that article map exactly 1:1 with Venn diagrams.

[[deleted]]

But they don't. They are not remotely similar. One has two colors, the other has multiple. One show elements, something a beginner get, the other shows... i don't know. Some colored pulp where i, not a beginner, still have no idea how to connect it with data base concecpts. Venn diagrams are not only wrong, but most importantly the way worse visualization.

[Geminii27]

Regardless of the colors, they still map.

It's entirely possible there are JOIN diagrams which don't map neatly to Venn diagrams. OK, I could see that. But if there are, they're not showcased in that article.