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I really don't see the point here. If I turn the "correct" diagrams sideways, it looks very much like a venn diagram again.
by Vogtinator 8y ago
I really don't see the point here.
If I turn the "correct" diagrams sideways, it looks very much like a venn diagram again.
- 0xfffafaCrash 8y agoYep: https://i.imgur.com/cgYkQbS.png https://i.imgur.com/cgYkQbS.png I'm drawing the conclusion that some people just need to see arbitrary concrete values to be able to understand what's going on.
- _underfl0w_ 8y agoThis seems to be more accurate. The primary contribution here is the concrete values. Otherwise it's literally a square, sideways Venn Diagram. You can turn your phone sideways to confirm.
- Thorrez 8y agoI see that those circles look like a Venn diagram. But for a Venn diagram to be useful in explaining something, there needs to be an easily understandable definition about what the 2 circles are. That doesn't seem to exist here. I can't come up with a logical definition for what the top circle or the bottom circle represent.
- johnNash05 8y agoThis image isn't opening on my end. Can you please share in another format. You can use https://www.coolutils.com/TotalImageConverter https://www.coolutils.com/TotalImageConverter
- Too 8y agoIn a venn diagram the sum of the area combined by A and B can never be larger than A+B. In a join the result can multiply and you get up to A*B rows instead. Hence the geometrical representation can mislead you into thinking your data is smaller than what it actually is. As a quick mental model i think the diagrams can help but you have to understand they are only a reminder of how the join is being matched, not a representation of the complete data set.