PDF Notes: 47027_Module 1 (Key constraints)

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    What are integrity constraints?

    Rules that ensure data accuracy and consistency.

    What is entity integrity?

    Ensures each table row has a unique identity.

    What is referential integrity?

    Maintains consistency between related tables.

    What is domain integrity?

    Validates data values within a specific range or type.

    What are key constraints?

    Ensure uniqueness and identification of records.

    How does a primary key differ from a unique key?

    Primary key cannot be NULL; unique key can be NULL.

    What happens if a foreign key value does not exist in the referenced table?

    Referential integrity is violated.

    What is the purpose of a CHECK constraint?

    Validates specific conditions for data entry.

    What does a NOT NULL constraint do?

    Prevents NULL values in a specified column.

    What is the implication of a DEFAULT constraint?

    Provides a default value if none is specified.

    How is a composite key defined?

    Combination of columns used as a primary key.

    What is an example of domain integrity?

    Age must be between 18 and 30.

    What does a UNIQUE constraint ensure?

    No duplicate values are allowed in the column.