Explain primary key, foreign key, super key and composite key with the help of an example for each key. Also write the important features of each.

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Primary Key:
A primary key is a unique identifier for a record in a table. It ensures that each record can be uniquely identified, and no two records have the same primary key value. For example, in a table of students, the student ID can be a primary key. Key features include uniqueness, non-null ______ _______ ______ ________ ___ ___ _______.
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