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What is the main difference between read-only and update methods?
A read-only method does not affect the values of a variable in an object, whereas an update method may alter the values of the variables
tell me the functionality,advantages and disadvantages of student database
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
What is entity in DBMS? Entity: A DBMS entity is either a thing in the modelled world or a drawing element in an ERD.
Which method is used to key transformation ? A hash method is used to key transformation.
What is schema
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
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
List two restrictions that are applied on the modification (updation, insertion or deletion) of base tables through view. Ans: The two restrictions are: 1. If a view
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
Question: (a) Prepare an ERD for the scenario given below. (b) Convert the ER diagram produced in (a) above into its physical design. You have to choose an appropriate Pri
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