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Database1 Lab Introduction: Primary Key Concepts

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Database1 Lab Introduction: Primary Key Concepts

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Questions and Answers

What is the primary purpose of a primary key in a database table?

To ensure that each row in the table is unique and identifiable (correct)

To provide a way to sort the data in the table

To allow for the storage of NULL values in the table

To establish a relationship between two tables

Which of the following is a valid constraint for a primary key column?

The column can have its value changed over time

The column can contain duplicate values

The column can contain NULL values

The column must be unique within the entire table (correct)

What is the purpose of a foreign key in a database table?

To provide a way to sort the data in the table

To allow for the storage of NULL values in the table

To establish a relationship between two tables (correct)

To ensure that each row in the table is unique and identifiable

What is the relationship between the 'Department' table and the 'Employee' table in the given example?

The 'Department' table is the parent table, and the 'Employee' table is the child table Signup and view all the answers

What is the purpose of referential integrity in a database?

To establish and maintain logical relationships between tables to avoid data corruption Signup and view all the answers

What is the main concept of REFERENTIAL INTEGRITY?

It does not allow to add any record in a table that contains the foreign key unless the reference table containing a corresponding primary key. Signup and view all the answers

What is the first database rule of Referential Integrity?

You must check that there are no records in related tables that require the record which you are deleting. Signup and view all the answers

What is the second database rule of Referential Integrity?

You must check that the related information exists in parent table in PK column before adding information to a table. Signup and view all the answers

What happens if you try to delete a primary key that has dependencies (foreign keys related to it)?

You can not delete the primary key if it has Dependencies (FK related to it). Signup and view all the answers

What is the relationship between a Primary Key (PK) and a Foreign Key (FK)?

The value of a FK must exist in the PK column it refers to. Signup and view all the answers