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Define an operator that a Relational Algebra does not have
Ans: Relational Algebra does not have Aggregation operators.
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
Differentiate between Primary and secondary storage? Primary and secondary storage - Primary storage device stores the data temporarily. Primary storage is commonly used thro
why we fregment at all?
What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
what is query processing ,query optimization and performance turring?
management information system based on functional organisation
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
Example: //REVOKE ALL ON EMP FROM MCA12; (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-
In an organization several projects are undertaken. Each project can employ one or more employees. Each employee can work on one or more projects. Each project is undertaken on the
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
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