What is a Primary Key and Foreign Key

When working with databases in your information analytics initiatives, greater than probably you may address a number of desk. As a result in certain eventualities there shall be a hyperlink between the tables This will just be sure you ought to use information from the two or further tables that could be joined collectively. But how would you do that? In order to hitch two tables, you will have columns in every tables which have values which may be distinctive and of comparable values. In totally different phrases you could possibly create what is often called a main key, its traits are as follows: Its values are distinctive. They cannot be null.

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