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so welcome students so students today we are going to understand the difference uh between these keys now in the previous class we have discussed about the primary key and i told you that a primary key is a unique key that is associated with every record so we cannot have duplicates so if we set a particular field as a primary key so that should be unique for every record so this is something that we have learned in the previous class and today we are going to understand the difference of between the primary key the candidate key the alternate keys the composite key and the foreign key so let us understand the difference so let us take an example and this is a table for the vehicle table now in this particular table these are the fields the columns and the columns are the id now normally by default we set id as the primary key so id will always hold a number that will be unique for every record so by default anyway we have the id for this particular table and then we have the model na