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A super key is an attribute or set of attributes used to recognize the records uniquely in a relation.
For instance, in the Relation PERSON defines earlier PERSON_ID is a super key since PERSON_ID is unique for every person. Likewise (PERSON_ID, AGE) and (PERSON_ID, NAME) are also super keys of the relation PERSON as their combination is also unique for each record.
WHAT IS MEANT BY E-R MODEL
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
(a) Why did SAP introduce the extended star schema?
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Critically explained the benefits and limitations of different database technologies with proper examples
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