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hey everybody welcome back again in todays video Im going to be explaining joins in MySQL a join is a clause that is used to combine rows from two or more tables based on a related column between them such as a foreign key heres an example I have two tables a table of transactions and a table of customers think of these two tables as a Venn diagram transactions will be the table on the left customers will be the table on the right whatever data they have in common is the middle part of our Venn diagram for my demonstration to make more sense I will need to add a few extra rows feel free to pause the video if you need to catch up I will insert into transactions a new row the amount is one dollar the customer ID is null so not all transactions can have a customer ID that foreign key heres a scenario suppose that somebody comes in pays for a soda with cash well we wouldnt have a customer ID right if a customer instead paid with a credit card we could track who that customer was there
