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What is database development?
Database systems can be either referential, flat or heiarchial.
What is database development methdology?
Database systems can be either referential, flat or heiarchial.
What happens if referential integrity is not enforced?
Without referential integrity enforcement, data inconsistencies may arise, such as orphaned records or invalid references between tables. This can lead to data corruption, incorrect query results, and difficulty maintaining and updating the database. Overall, without referential integrity, the data integrity and reliability of the database can be compromised.
Describe database normalization?
Database Normalization is the process of organizing the fields and tables of a relational database to minimize redundancy and dependency
What is data dependency in DBMS?
Data dependency in DBMS refers to the relationship between different data elements within a database. There are three main types: functional dependency (one attribute determines another), partial dependency (part of a composite key determines other attributes), and transitive dependency (dependency between non-key attributes). Understanding data dependencies is crucial for database normalization and maintaining data integrity.
How functional dependency is related to database table design?
The functional dependency is related to the database table design through the foreign and primary keys. The foreign and primary keys are functionally dependent on each other.
Difference between partial dependency and fully functional dependency?
The difference is that partial dependency is when a database's attribute is only partially dependent on the primary key. Fully functional dependency is when the attribute is entirely dependent on the key.
Why is it desirable to enforce the referential integrity rules and entity integrity rules?
Database Management Systems ensure consistent data if the database is modeled using proper referential integrity. For example, if a Customer record is deleted from the system, all Orders and Order Items pertaining to that Customer should ideally be cleaned up. Same thing is true for a specific Order. Such logic need not be in the application, instead you can set up database referential integrity rules to perform these cascading actions automatically for you.
What does a database displays both entity integrity and referential integrity mean?
Entity integrity ensures that each record in a database table has a unique identifier, usually a primary key, while referential integrity ensures that relationships between tables are maintained through foreign key constraints, preventing orphaned records and ensuring data consistency. Displaying both entity and referential integrity means that the database is structured to enforce these rules, helping to maintain data accuracy and reliability.
When dbms becomes rdbms?
A DBMS becomes an RDBMS when the data contained in its tables are related to one another by referential integrity rules. DBMS - Database Management System RDBMS - Relational Database Management System
Describe the dependency diagram and explain its purpose?
A dependency diagram is a visual representation of a dependency graph. Dependency diagrams are integral to software development, outlining the complex, interrelationships of various functional elements. Typically in a dependency diagram, arrows point from each module to other modules which they are dependent upon.The dependency diagram is used as an aid to normalization within database design.
In what field is referential integrity applied?
Referential integrity is commonly applied in database management. It ensures that relationships between tables are maintained by enforcing constraints to prevent actions that would result in orphaned records or data inconsistencies.
