Free Relationships Should NOT Be Natural! Tutorial

“>As designers, we all learn early how to implement relationships using a relational database management system (RDBMS). We establish the connection by carrying the same data value in both of the tables. To put the two rows together, we simply join where the data values match up. We then cement that relationship with primary keys and foreign keys. What column should we use to do this? A big temptation is to use data that occurs “naturally”—data values that everyone knows and unde 
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