Please Include The Questions With Your Answers Answer In Complete Sen
A database is a model of a user’s view of the world. We must ask ourselves “How well does it fit the mental models of the people who are going to use the system?” Discuss why it’s important that the model fits the user requirements, even if the developer “knows better.”
It is crucial that the database model aligns with the user’s mental models because users rely on their understanding of how the system operates to interact effectively and efficiently. When a model fits user requirements, it reduces confusion, minimizes errors, and increases user satisfaction and productivity. Even if developers believe their design is more optimal from a technical perspective, if the model does not resonate with users’ expectations, it can lead to misunderstandings, resistance to using the system, and a failure to achieve the intended goals. Therefore, user-centered design ensures that the system is more intuitive and easier to adopt, ultimately leading to more successful implementation and better data management.
Write the SQL SELECT statement to display the property type, rooms, and rent sorted by the Type.
Using the PROPERTY table, the SQL query to display the property type, number of rooms, and rent sorted by the property type is:
SELECT Type, Rooms, Rent
FROM PROPERTY
ORDER BY Type;
Write the SQL SELECT statement to display the average rent of the properties.
Using the PROPERTY table, the SQL query to display the average rent of all properties is:
SELECT AVG(Rent) AS Average_Rent
FROM PROPERTY;
What is normalization? Explain why it is important.
Normalization is a systematic process in database design that organizes data to minimize redundancy and dependency by dividing large tables into smaller, related tables. The primary goal of normalization is to eliminate duplicate data, ensure data integrity, and improve efficiency in database operations. It involves
applying a series of rules, or normal forms, to achieve these objectives. Normalization is important because it enhances data consistency, reduces storage costs, and simplifies maintenance by making the database structure logical and flexible. Proper normalization leads to fewer update anomalies, easier data retrieval, and a more robust database system that supports accurate and reliable data analysis.
List and describe the 4 components of a database system.
The four main components of a database system are:
Hardware:
This includes all physical devices involved in data storage, processing, and communication, such as servers, computers, and network equipment. Hardware provides the foundation for running database software.
Software:
This comprises the database management system (DBMS) software that manages data storage, access, and manipulation. It includes applications, utilities, and the DBMS itself that facilitate database operations.
Data:
The actual data stored within the database, including the data structures, files, and metadata that define the organization and properties of the stored information.
Procedures:
The instructions, rules, and practices governing how data is stored, maintained, and utilized. This encompasses database design, security protocols, backup and recovery procedures, and user access controls.