viewnotes/63/Management And Entrepreneurship Unit 1

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Explain the following terms : Database Management Systems - 10CS54 VTU notes 8 Marks (Dec/Jan 2014)

Domain constraint:
Semantic integrity constraint:
Functional dependency constraint :


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Domain constraint: Each attribute value must be NULL or drawn from the domain of that attribute. Note that some DBMS”s allow you to impose the not null constraint upon an VTUlive.com 22 attribute, which is to say that attribute may not have the value-null.

 Semantic integrity constraint: These are application specific restrictions that are unlikely to be expressible in DDL.
 Functional dependency constraint :It is a constraint b/w the two sets of attributes from two relations. 

Nikhil-bharadwaj

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