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hey everybody welcome to this video today we will be talking about self joins the way of self joined works is you take a table and you are essentially joining it with itself and thats what kind of makes self joins confusing and a lot of people cant find practical purposes for them Im going to be giving you draw my marker I just got white marker all self joins are complicated and a lot of people cant find practical purposes for them in this video Ill be giving you at least one good reason for them so hopefully this video is helpful so when you have a self join think of basically duplicating the table you have and making an exact copy and then joining those two tables together thats a good way you can think about it so for this example Im going to be using a user account system on a website and you know how some websites have like a referral option basically if you refer somebody you get like 20% of their money and earlier points or 10% of their money so forth thats like referra