Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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SIf a decomposition of a relation R into R¡ and R2 is lossless, then which of the followings are true?
|(a) R can be reproduced by natural join of R1 and R2 (i.e, by R¡ ¤R2)..
|(b) All the functional dependencies can be checked without computing Rị ¤ R2.
(c) R1NR2 forms a super key for either R1 or R2.
|(d) All of them.
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Transcribed Image Text:SIf a decomposition of a relation R into R¡ and R2 is lossless, then which of the followings are true? |(a) R can be reproduced by natural join of R1 and R2 (i.e, by R¡ ¤R2).. |(b) All the functional dependencies can be checked without computing Rị ¤ R2. (c) R1NR2 forms a super key for either R1 or R2. |(d) All of them.
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