Sample Answer : “Normalization is the process of organizing data into tables to minimize redundancy and dependency. It is important because it improves the efficiency of data storage, reduces the potential for errors, and ensures data consistency. I use normalization principles such as eliminating data redundancy and ensuring referential integrity.”
7. How do you handle transactions in SQL and what is their importance?
Description : Assesses the candidate’s understanding of transaction management and its role in data integrity.
Sample Answer : “I manage transactions spain telegram data using the BEGIN TRANSACTION, COMMIT, and ROLLBACK statements to ensure atomicity, consistency, isolation, and durability (ACID) of operations. This is crucial to ensure that database operations are performed completely and safely, even in the event of system failures.”
8. What are views in SQL and when would you use them in a project?
Description : Assesses the candidate’s understanding of views and their usefulness in database development.
Sample Answer : “Views are stored queries that act as virtual tables and return a result set. I use them to simplify complex queries, hide sensitive data, provide an abstraction layer over complex data, and improve performance by precomputing frequently used results.”
9. How do you ensure data integrity and security in a SQL database?
Description : Assesses the candidate’s ability to implement security measures and ensure data integrity.
Sample Answer : “I ensure data integrity by using integrity constraints such as primary keys, foreign keys, and validation rules. I implement user permissions and roles to control access to data, and I perform regular backups for data recovery in case of failures.”
10. What steps would you take to migrate a database to a new SQL platform?
Description : Assesses the candidate’s ability to plan and execute database migration.
Sample Answer : “To migrate a database, I would first perform a complete assessment of the existing schema and data. Then, I would design a detailed plan that includes setting up the new platform, converting data, verifying integrity, and performing thorough testing before deploying the migration to production.”
