Podcast
Questions and Answers
What happens when the CASCADE action is applied during a deletion?
What happens when the CASCADE action is applied during a deletion?
Which action prevents any changes if there are existing references?
Which action prevents any changes if there are existing references?
What is the effect of the SET NULL action when a referenced element is modified?
What is the effect of the SET NULL action when a referenced element is modified?
In the context of referential integrity constraints, which statement accurately describes RESTRICT?
In the context of referential integrity constraints, which statement accurately describes RESTRICT?
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If a reference is found during an action, what does the CASCADE action do?
If a reference is found during an action, what does the CASCADE action do?
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Study Notes
Referential Integrity Constraints
- Possible actions:
- RESTRICT: If a reference is found, deletion or modification is forbidden.
- SET NULL: If a reference is found, deletion or modification will update the reference with the NULL value.
- CASCADE: If a reference is found, deleting or modifying an element will cause the same operation on elements that reference it.
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Description
This quiz focuses on the various referential integrity constraints used in database management. Explore the implications of actions like RESTRICT, SET NULL, and CASCADE when modifying or deleting referenced elements. Test your knowledge on how these constraints affect data integrity.
