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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Which of the following describes something in a database that refers to the unique identifier in the Parent table?
Correct Answer: C. Foreign key
A foreign key in a database is a field (or collection of fields) in one table that refers to the unique identifier, typically the primary key, in another table—known as the parent table. This relationship helps maintain referential integrity by ensuring that the value in the child table matches a valid entry in the parent table. Foreign keys are essential in relational databases for linking related data across multiple tables.
Why Other Options are Incorrect:
A. Attribute
An attribute is a column in a database table that holds data. While it can store information, it does not define a relationship between tables or enforce referential integrity like a foreign key does.
B. Constraint
A constraint is a rule applied to a database column to enforce data integrity, such as NOT NULL or UNIQUE. While a foreign key is a type of constraint, the term "constraint" itself does not specifically refer to a reference to a parent table.
D. Schema
A schema is the structure or blueprint of a database, defining how data is organized, including tables, relationships, and constraints. It does not represent a specific data element that refers to a parent table’s unique identifier.
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