c) What is the importance of the Primary key?
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The purpose of a primary key is to implement a relationship between two tables. Without a primary key, relational databases wouldn't exist. Even though a primary key might sound a bit unusual, we use them in everyday life without realizing it. Student IDs are an example of a primary key.
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A primary key ensures that data is unique in one column, but the foreign key is what makes the data stay consistent, as that is where the important data lies that needs to stay consistent and integral.
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