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Hi, my names Taylor and Im going to walk you through some advanced ERD concepts. Today were going to be going over primary keys, foreign Keys, bridge tables, and then really understanding how ER diagrams help you see exactly whats going on in your database. So lets start where we left off--- with our very simple diagram from the previous tutorial. So weve got entities for Customer, Order, and Product and the correct cardinality between. Youll notice that next to each attribute is the word key. This column is here so we can distinguish certain attributes as either primary keys or foreign keys. Lets start with primary keys. This is probably easiest to understand if we step out of the diagram and into the table it represents. Remember, each entity in your diagram represents a table within your database. So lets look at the Customer entity as a table with rows and columns. Weve got all these different instances of the customer here. And if youre Amazon or something, youve got