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Define the terms 1) physical schema 2) logical schema.
Physical schema: The physical schema explains the database design at the physical level, which is the lowest level of abstraction describing how the data are actually kept.
Logical schema: The logical schema explains the database design at the logical level, which explains what data are kept in the database and what relationship exists between the data.
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
How to draw an ER diagram to a finance companz
The PROJECT operation The project operation is used to choose the records with specified attributes as discarding the others based on some related criteria. This is denotes as ∏
Describe about Use Case and external case in DFD The processes are transformed those into the Use Case and external case in DFD has same characteristics which of an actor in O
Problem: A DBMS built for Online Transaction Processing (OLTP) is usually regarded as unsuitable for data warehousing. Each system is designed with a different set of requireme
What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
Which database object does not physically exist? A view database object does not physically exist.
Differentiate between Procedural and non procedural languages ? Procedural and non procedural languages - A procedural language specifies the operations to be performed on th
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