Cognizant Programmer Analyst Interview Questions and Answers

Windows functions in SQL perform calculations across a set of table rows related to the current row.

• Windows functions allow you to perform calculations like SUM, AVG, COUNT without collapsing the result set.

• They are defined using the OVER() clause, which specifies the partitioning and ordering of the data.

• Example: SELECT employee_id, salary, AVG(salary) OVER (PARTITION BY department_id) AS avg_salary FROM employee...read more

OOPs (Object-Oriented Programming) is a programming paradigm based on objects and classes, promoting code reusability and modularity.

• Encapsulation: Bundling data and methods that operate on the data within one unit (e.g., a class).

• Inheritance: Mechanism to create a new class using properties and methods of an existing class (e.g., a 'Dog' class inheriting from an 'Animal' class).

• Polymorphism: Ability to present th...read more

Partitions divide data into distinct sections, while clusters group similar data points together for analysis.

• Partitioning involves dividing a dataset into non-overlapping segments, e.g., dividing a database into tables.

• Clustering groups similar data points based on characteristics, e.g., customer segmentation in marketing.

• Partitions are often used for data organization and management, while clusters are used for ...read more

Modern data warehousing enhances scalability, performance, and analytics capabilities for better decision-making.

• Scalability: Modern data warehouses can easily scale to accommodate growing data volumes, such as cloud-based solutions like Snowflake.

• Real-time analytics: They support real-time data processing, enabling businesses to make timely decisions, as seen with platforms like Google BigQuery.

• Cost-effectiveness...read more

This SQL query retrieves the employer with the highest salary from a given database table.

• Use the SELECT statement to specify the columns you want to retrieve, such as employer name and salary.

• Utilize the MAX() function to find the highest salary in the salary column.

• Combine the MAX() function with a subquery to get the corresponding employer's name.

• Example Query: SELECT employer_name FROM employees WHERE salary =...read more

SAP ABAP is a high-level programming language used for developing applications on the SAP platform.

• ABAP stands for Advanced Business Application Programming.

• It is primarily used for developing business applications in SAP environments.

• ABAP programs can be executed on the SAP NetWeaver Application Server.

• Common use cases include report generation, data manipulation, and interface development.

• Example: Creating custo...read more