Capco Technologies Data Analyst Interview Questions and Answers

Power Pivot is a data analysis tool in Excel that allows users to create powerful data models, perform calculations, and generate insights.

• Power Pivot is an Excel add-in used for data analysis and modeling.

• It allows users to import and manipulate large datasets from different sources.

• Users can create relationships between tables, perform calculations, and create advanced data visualizations.

• Power Pivot is commonly used...read more

To retrieve data over 3 months in a dynamic dashboard, use a date range filter and ensure the data source is updated regularly.

• Create a date range filter in the dashboard to select a time period of over 3 months

• Ensure the data source is updated regularly to include the required data

• Use SQL queries or data extraction tools to pull the necessary data for the dashboard

• Consider automating the data retrieval process to ensu...read more

A Dicreat Chart is a type of chart that displays data points in a discrete manner, typically using bars or columns.

• Dicreat Charts are used to represent categorical data, where each category is represented by a separate bar or column.

• They are commonly used in market research, survey data analysis, and comparison of different categories.

• Examples of Dicreat Charts include bar charts, column charts, and stacked bar charts.

SQL join is used to combine rows from two or more tables based on a related column between them.

• Types of SQL joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table...read more

Stored procedures are precompiled SQL queries stored in a database for reuse.

• Stored procedures are precompiled SQL queries stored in a database for reuse

• They can improve performance by reducing network traffic and increasing security

• Stored procedures can be used to encapsulate business logic and complex queries

• Examples include procedures for updating customer information or calculating sales totals

CTE stands for Common Table Expressions. It is a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.

• CTEs are defined using the WITH keyword in SQL.

• They help improve readability and maintainability of complex queries.

• CTEs can be recursive, allowing for hierarchical data querying.

• Examples: Recursive CTEs for querying organizational hierarchies, CTEs for data transformation be...read more

Matrix in PowerBi is a visual representation of data in rows and columns, allowing for easy comparison and analysis.

• Matrix displays data in a grid format with rows and columns

• It allows for easy comparison of data across different categories

• Users can drill down into the data to see more detailed information

• Matrix can be used to create interactive reports and dashboards

Lambda function is an anonymous function in Python that can have any number of arguments, but can only have one expression.

• Used for creating small, throwaway functions without a name

• Commonly used with functions like map(), filter(), and reduce()

• Can be used to define functions inline without the need to formally define a function using def keyword

To manipulate datasets in Python, steps include loading data, cleaning data, transforming data, and analyzing data using libraries like Pandas.

• Load the dataset using Pandas library

• Clean the data by handling missing values, removing duplicates, and correcting data types

• Transform the data by applying functions, merging datasets, and creating new columns

• Analyze the data by performing statistical analysis, visualizations, ...read more

DAX data types are used in Power BI and Excel to define the type of data stored in a column or measure.

• DAX data types include Integer, Decimal Number, String, Boolean, Date, Time, DateTime, and Currency.

• Data types are important for calculations and formatting in DAX formulas.

• For example, using the correct data type for a column can ensure accurate calculations and visualizations.

Developed a predictive analytics model to forecast customer churn rate in a telecom company.

• Utilized machine learning algorithms to analyze customer data

• Identified key factors contributing to customer churn

• Built a predictive model to forecast future churn rate

• Collaborated with cross-functional teams to implement strategies to reduce churn