kipi.ai Senior Leader Engineer Interview Questions, Process, and Tips

Data modelling involves creating a visual representation of data relationships and processes.

• Data modelling is the process of creating a data model for a database.

• It involves identifying the entities, attributes, relationships, and constraints of the data.

• Data modelling helps in organizing data effectively and ensuring data integrity.

• Common data modelling techniques include Entity-Relationship (ER) modelling and UML di...read more

SQL query optimization involves identifying and fixing inefficient queries to improve performance.

• Identify slow queries using tools like query execution plans or monitoring tools.

• Optimize queries by using indexes, avoiding unnecessary joins, and rewriting complex queries.

• Consider denormalizing tables or using materialized views for frequently accessed data.

• Test and benchmark query performance after optimization to ensu

ETL focuses on extracting, transforming, and loading data in a sequential process, while ELT involves loading data into a target system first and then performing transformations.

• ETL: Extract, Transform, Load - data is extracted from the source, transformed outside of the target system, and then loaded into the target system.

• ELT: Extract, Load, Transform - data is extracted from the source, loaded into the target system...read more

To find out who is the manager of whom from the employee table.

• Join the employee table with itself on the manager_id and employee_id columns

• Select the employee name and manager name based on the join condition