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What is the main concept of referential integrity?
What is the main concept of referential integrity?
- It prevents adding records in a table that contain a foreign key, unless there is a corresponding primary key in the reference table. (correct)
- It maintains consistency between primary keys across different tables.
- It ensures that all tables have both primary and foreign keys.
- It allows adding any record in a table that contains a foreign key, regardless of the primary key in the reference table.
Which of the following is NOT a rule of referential integrity?
Which of the following is NOT a rule of referential integrity?
- Do not delete data required by another table.
- Allow duplicate primary keys in the parent table. (correct)
- Do not add incompatible data to a child table.
- Value of foreign key must exist in the primary key it refers to.
What happens if you try to delete a primary key that has related foreign keys?
What happens if you try to delete a primary key that has related foreign keys?
- The deletion is allowed, and all related foreign keys are also deleted.
- The deletion is not allowed, as it would violate referential integrity. (correct)
- The deletion is allowed, but all related foreign keys are set to NULL.
- The deletion is allowed, but a warning is displayed about the related foreign keys.
Which of the following statements is true about foreign keys?
Which of the following statements is true about foreign keys?
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What is the purpose of the rule "Do not add incompatible data to a child table"?
What is the purpose of the rule "Do not add incompatible data to a child table"?
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