I looked all over the Internet for a good graphical representation of SQL JOIN s, but I couldn’t find any to my liking.
Some had good diagrams but. I looked all over the Internet for a good graphical representation of SQL JOIN s, but I couldn’t find any to my liking.
Some had good diagrams but. I saw this “SQL joins as Venn diagrams” image on this Twitter page.
To give attribution to the original author, it appears to have been created by. I think your main underlying confusion is that when (for example) only A is highlighted in red, you’re taking that to mean “the query only returns.
The easiest and most intuitive way to explain the difference between these four types is by using a Venn diagram, which shows all possible logical relations.Say NO to Venn Diagrams When Explaining JOINs In recent times, there have been a couple of tremendously popular blog posts explaining JOINs using Venn Diagrams schematron.org SQL cross join. A Visual Explanation of SQL Joins I thought Ligaya Turmelle’s post on SQL joins was a great primer for novice developers. Since SQL joins appear to be set-based, the use of Venn diagrams to explain them seems, at first blush, to be a natural fit.
A Venn Diagram showing sql joins. You can edit this Venn Diagram using Creately diagramming tool and include in your report/presentation/website.
If you have tried to understand how joins work and constantly get confused about what join to use, you just need to keep a simple picture in mind (I like pictures). I will be explaining joins by referencing a .
The point of using a Venn Diagram is for illustrative purposes. If I’m using a Venn Diagram when I’m showing someone Joins, its probably their first exposure to joins (or nearly first).
As soon as I say cartesian product I’ve lost them, and the graphic is Orders .SQL Join Types — SQL Joins ExplainedSay NO to Venn Diagrams When Explaining JOINs – Java, SQL and jOOQ.