KwickClips Databases and SQL · 40 sec · free
What is an orphan record?
Short answer. A child row with no matching parent.
What does No action do on delete?
It blocks the delete.
Referential integrity
| Foreign key must exist |
| Unknown AdmNo is refused |
| No orphan records |
Remember
| Child needs a real parent |
| No action blocks deletes |
A receipt for a missing student? Not with referential integrity. Foreign keys must exist in the parent. Unknown numbers are refused. No orphans. Two points. A child needs a real parent. No action blocks deletes.
This clip is from the full lesson: Relationships Between Tables in Base — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402)
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Where do you create a relationship?41 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy