Wells Fargo Analytics Consultant Interview Questions, Process, and Tips

Q1. What is the meaning of Data Aggregation?
Ans. 
Data aggregation refers to the process of combining and summarizing data from multiple sources into a single dataset.
• Data aggregation involves collecting and merging data from various sources.

• It aims to provide a consolidated view of the data for analysis and reporting.

• Aggregated data is typically summarized using statistical functions like sum, average, count, etc.

• Examples of data aggregation include calculating total...read more
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Q2. Delete duplicate Records in SQL
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To delete duplicate records in SQL, use the DELETE statement with a subquery to identify and remove the duplicates.
• Use the GROUP BY clause to group the records by the columns that define duplicates.

• Use the HAVING clause to filter the groups and keep only the duplicates.

• Use the DELETE statement with a subquery to delete the duplicate records.
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Q3. What are the different types of Join used in SQL?
Ans. 
Different types of joins in SQL include inner join, left join, right join, and full outer join.
• Inner join returns only the matching rows from both tables

• Left join returns all rows from the left table and the matching rows from the right table

• Right join returns all rows from the right table and the matching rows from the left table

• Full outer join returns all rows from both tables, including unmatched rows
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Q4. What is subquary ? Why it is required ?
Ans. 
Subquery is a query within another query. It is required to retrieve data from multiple tables or to perform complex calculations.
• Subquery is enclosed within parentheses and is executed first before the main query.

• It can be used in SELECT, FROM, WHERE, and HAVING clauses.

• Subquery can be correlated or non-correlated.

• Examples of subquery include finding the maximum or minimum value in a table, filtering data based on a c
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Q5. What is the meaning of Trigger in Python?
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A trigger in Python is an event that causes a specific function or code to execute.
• Triggers can be used to automate tasks or respond to specific events.

• They are often used in web development to execute code when a user interacts with a webpage.

• Triggers can also be used in databases to execute code when certain data is inserted, updated, or deleted.

• Examples of triggers in Python include mouse clicks, keyboard inputs, an
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Q6. Componets of Tableau ? What are the different connection is there in Tableau ?
Ans. 
Tableau components include Desktop, Server, Prep, Online, Public. Different connections include live, extract, ODBC, cloud, etc.
• Tableau components: Desktop, Server, Prep, Online, Public

• Different connections: Live, Extract, ODBC, Cloud, etc.

• Live connection: Directly connects to the data source and updates in real-time

• Extract connection: Data is extracted and stored in Tableau's proprietary format for faster performance

• O...read more
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Q7. Find out Top 5 highest paid Employees ?
Ans. 
Top 5 highest paid employees are identified based on their salary.
• Identify all employees and their salaries

• Sort the employees based on their salary in descending order

• Select the top 5 employees with the highest salary
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Q1. Regarding skill set and intro
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Q2. Basic intro question on experience
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Q1. Technical skill questions advanced category
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Q1. Questions related to relocation if you want to relocate and why would you look to join this org and salary
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General altitude with MAT level question

Q1. Questions from CV, guesstimates, data science questions
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Q2. What is Random forest
Ans. 
Random forest is an ensemble learning method used for classification and regression tasks.
• Random forest is made up of multiple decision trees

• Each tree in the forest is built using a subset of the training data and a random selection of features

• The final prediction is made by averaging the predictions of all the individual trees

• Random forest is known for its high accuracy and ability to handle large datasets

• It is a popu...read more
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Q3. Hypothesis testing
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Q4. Guesstimates Question on no.of marriage in a year
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Q1. Introduction, why Wells, strength, what do I know about it.
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Q1. Explain end to end data solution and how did you handle a challenging or difficult situation in current role ?
Ans. 
End to end data solution involves collecting, processing, analyzing, and presenting data to address business needs.
• Collecting data from various sources such as databases, APIs, and files

• Cleaning and processing data to ensure accuracy and consistency

• Analyzing data using statistical methods and machine learning algorithms

• Presenting insights and recommendations to stakeholders

• Handling a challenging situation: Resolving di...read more
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Q2. Thoroughly explain the project, process, platform, components, integrations and development life cycle followed. With an example, explain how you handled a complex technical problem/implementation or may ...read more
Ans. 
I led a project to develop a predictive analytics platform for a retail company, integrating various data sources and implementing machine learning models.
• Developed project scope and requirements with stakeholders

• Designed data architecture and selected appropriate tools and technologies

• Integrated data from multiple sources including CRM, POS, and online platforms

• Implemented machine learning models for demand forecastin...read more
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Q1. About Roles and Responsibilities
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Q2. Tableau Application
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Q3. Powerbi Application
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Q1. Salary Discussion
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