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Understanding Keys in Relational Databases: Candidate, Primary, and Foreign Keys

Explains the role of keys in relational databases and their impact on data integrity.

Christopher Lee
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Understanding Keys in Relational Databases: Candidate, Primary,and Foreign KeysHow do you select the primary key from the candidate keys? How doforeign keys relate to candidate keys? Provide examples from either yourworkplace or classassignments.A candidate key one which can be used as a primary key that is not nulland unique constraint both holding true. All primary keys are definitelycandidate keys.A candidate key is a minimal super key with minimum number of attributes.A foreign key is a field in a relational table that matches the primary key ofanother table. The foreign key can be used to cross-reference tables. Oneadvantage of using a proper naming convention for table attributes is thatyou can identify foreign keys more easily.I guess a foreign key and acandidate keycan have tables that are linked through a common attribute.One example that is provided by the text (STU_LName)(STU_FNAME)(STU_PHONE). This is an example of a candidate keybasically for the student's last name, students first name, and the studentstelephone number. As for as my workplace it would be (EMP_LNAME)(EMP_FNAME) (EMP_PHONE). As far as the foreign key Table Name:Vehicle, Primary key VIN Vehicle Identification number, Foreign Key Tiremaintenance.Response 2Keys are, as their name suggests, a key part of a relational database and avital part of the structure of a table. They ensure each record within a tablecan be uniquely identified by one or a combination of fields within the table.They help enforce integrity and help identify the relationship betweentables. There are three main types of keys, candidate keys, primary keysand foreign keys. There is also an alternative key or secondary key thatcan be used, as the name suggests, as a secondary or alternative key tothe primary keySuper Key

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