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Hello friends, Welcome to Gate Smashers The topic is foreign key In this video we are going to discuss about foreign key In the earlier video also, I had discussed about foreign key And I had kept it, foreign key part one In Part One, we had a discussed, what is Actually a foreign key? And what is the sequel command for making the foreign key means How do you make Foreign key in a table. During the table creation after the table creation. But what is the actual funda of foreign key? What is the basic concept of foreign key? That we, i gave it a name foreign key part-2 but this is very very important concept. Because here we are going to discuss. We had mention foreign key there, that it maintains referential integrity. Foreign key maintain referential Integrity. These are the lines you always remember, because in any interview, any exam whether in GATE or in UGC NET exam it has also been asked in the university college exam. People know about the foreign key but dont know whats the a