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Designing Relational Database Schema Video Lecture | SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

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FAQs on Designing Relational Database Schema Video Lecture - SSC CGL Tier 2 - Study Material, Online Tests, Previous Year

1. What is a relational database schema?
Ans. A relational database schema refers to the structure or blueprint of a database system. It defines the tables, columns, relationships, and constraints that make up the database. It provides a logical representation of how data is organized and stored in the database.
2. How is a relational database schema designed?
Ans. Designing a relational database schema involves several steps. First, the requirements of the application or system using the database need to be analyzed. Then, entities and relationships are identified and represented using entity-relationship diagrams. The attributes of each entity are determined, and primary and foreign keys are established. Finally, normalization techniques are applied to ensure data integrity and minimize redundancy.
3. What is the importance of a well-designed relational database schema?
Ans. A well-designed relational database schema is crucial for efficient and effective data management. It provides a clear structure for organizing and accessing data, ensuring data integrity and consistency. It also facilitates data retrieval and manipulation, enabling faster query execution and improved system performance. Additionally, a well-designed schema allows for easier maintenance, scalability, and flexibility of the database system.
4. How does a relational database schema ensure data integrity?
Ans. A relational database schema ensures data integrity through various mechanisms. It uses primary keys to enforce entity uniqueness and referential integrity constraints to maintain relationships between tables. Additionally, it can specify data types, ranges, and constraints for each attribute, preventing the insertion of invalid or inconsistent data. The schema can also incorporate triggers and stored procedures to enforce complex business rules and validate data modifications.
5. Can a relational database schema be modified after it is implemented?
Ans. Yes, a relational database schema can be modified after it is implemented. However, it requires careful planning and consideration to avoid data loss or inconsistencies. Modifications can include adding or removing tables, altering table structures, or changing relationships and constraints. It is important to analyze the impact of schema changes on existing data and applications, and to plan for data migration and system downtime if necessary.
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