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Example
RELATION SCHEMA for STUDENT:
STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
STUDENT
ROLLNO
NAME
AGE
t1 3467
Shikha
[email protected]
20
t2 4677
kanu
Where t1 = (3467, Shikha, [email protected], 20) for this relation instance, m = 2 and n = 4.
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Attribute Preservation This is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being decomposed.
Example: RELATIONAL SCHEMA for PERSON: PERSON (PERSON_ID: integer, NAME: string, AGE: integer, ADDRESS: String) RELATION INSTANCE In this instance, m = 3 and n = 4
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
What is schema
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