Question
Download Solution PDFमाना एक रिलेशन r(R) AB → C, C → D तथा D → A को संतुष्ट करता है। इस रिलेशन की केंडिडेट कुंजियाँ क्या होंगी?
This question was previously asked in
HTET PGT Official Computer Science Paper - 2017
Answer (Detailed Solution Below)
Option 3 : AB तथा DB
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HTET PGT Official Computer Science Paper - 2019
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Detailed Solution
Download Solution PDFIf closure defined the complete relation then become the candidate key.
- Closure of AB = (AB)+ = {A,B,C,D} /candidate key
- Closure of BC = (BC)+ = {A,B,C,D} /candidate key
- Closure of CD = (CD)+ = {C,D,A}
- Closure of DB = (DB)+= {B,C,D,A} /candidate key
- Closure of ABCD = (ABCD)+= {A,B,C,D} /super key
- Closure of AD = (AD)+ = {A,B,D}
The candidate keys are AB. BC, BD
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