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Explain I command in QBE ?
I : It is the command in QBE that is used to insert tuple (s) into the database
Define outer union operation of the relational algebra. Compute the outer union for the relations R and S given below. Outer Join - If there are any values in one tabl
What are metrics for choosing the best algorithm? Matrices for choosing the best algorithms are as below: Computational complexity Ease of understand ability and im
data models are being replaced over years. Reasons and why does that happen?
Defining Internal Classes and Operations When we enlarge algorithms, new classes can be added to the store intermediate results. A complex operation could be looked at, as a c
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
Rearrange Classes and Operations Sometimes, the similar operation is defined across different classes and can easily be inherited from a familiar ancestor, but more often oper
Example -Find the employee name, salary, department number and average salary of his/her department, for those employees whose salary is more than the average salary of that depart
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
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