# Sql Join Venn Diagram

*Edit*

**Sql Join Venn Diagram**. Venn diagram was so confusing.absolutely useless for explaining SQL JOINS to rookies. Venn diagrams are suitable for representing set operations such as UNION, INTERSECTS, EXCEPT etc.

SQL OUTER JOIN - left outer join example. Venn diagram was so confusing.absolutely useless for explaining SQL JOINS to rookies. Venn Diagrams are perfect to illustrate … actual set operations!

### The idea of translating it in R originates from J.

PROC SQL joins do not require that common variable have the same name in the data sets you are joining, while you need to have common variable name listed in BY option when Venn Diagram : Inner Join.

Note: It is very easy to visualize a join query as a Venn diagram, where each of the tables is represented by intersecting shapes. A SQL Join is a special form of generating a meaningful data by combining multiple tables relate to each other using a "Key". However, like the commenters to her post, I found that the Venn diagrams didn't quite match the SQL join syntax reality in my testing.