What do you understand by database? How does it differ from DBMS?
What is meant by NULL value? What are the reasons that lead to their occurrence in database relations?
How are computers useful in processing the accounting data?
Define foreign key. How is this concept useful in relational data model? Illustrate with suitable example.
What do you understand by the concept of weak entity used in data modelling? Explain the relevance of owner entity type, partial key and identifying relationship in the context of such modelling.
What do you understand by union compatibility of relations? For which operations such compatibility is required and why?
What do you understand by database? How does it differ from DBMS?
What is meant by NULL value? What are the reasons that lead to their occurrence in database relations?
How are computers useful in processing the accounting data?
Define foreign key. How is this concept useful in relational data model? Illustrate with suitable example.
What do you understand by the concept of weak entity used in data modelling? Explain the relevance of owner entity type, partial key and identifying relationship in the context of such modelling.
What do you understand by union compatibility of relations? For which operations such compatibility is required and why?