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Write short notes on relational model
The relational model uses a collection of tables to show both data and the relationships between those data. The relational model is an example of a record based model.
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What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
List some instances of collection types? a) sets b) arrays c) multisets
What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
Benefits of heap files 1. This is a easy file Organisation method. 2. Insertion is somehow capable. 3. Good for bulk-loading data into a table. 4. Best if file
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
explain cascading rollback
Explanation on Data Sharing?
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