Trick LEFT JOIN Treat = Trick $$\cup$$ (Trick $$\cap$$ Treat)

Trick RIGHT JOIN Treat = (Trick $$\cap$$ Treat) $$\cup$$ Treat

I don't even know what that means so now I have a new rabbit hole to go down. 

https://i.giphy.com/media/v1.Y2lkPTc5MGI3NjExZmo3ZWY5Mmx4OWg2Y2o4b3YzYm03enk2d2pjOG4xNTFmbjBxMHoxcCZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/swtiK9jRfE0zS/giphy.gif

Jon_Hodl

Memes

Trick OR Treat, Trick AND Treat, Trick XOR Treat...

now to Trick LFET JOIN Treat
and Trick RIGHT JOIN Treat
