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Wells Fargo Senior Data Analyst Interview Questions, Process, and Tips
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1 interview found
I applied via Naukri.com and was interviewed in Jan 2024. There was 1 interview round.
(4 Questions)
- Q1. What are joins,
- Ans.
Joins are used in databases to combine rows from two or more tables based on a related column between them.
Joins are used to retrieve data from multiple tables based on a related column between them
Common types of 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 th...
- Q2. Difference between having and where
- Ans.
The main difference between 'having' and 'where' in SQL is that 'having' is used with aggregate functions, while 'where' is used with individual rows.
HAVING is used to filter groups of rows based on aggregate functions, such as COUNT, SUM, AVG, etc.
WHERE is used to filter individual rows based on specific conditions.
HAVING is applied after the GROUP BY clause, while WHERE is applied before.
Example: SELECT department, A...
- Q3. What are analytical functions explain all
- Ans.
Analytical functions are used in SQL to perform calculations across a set of rows related to the current row.
Analytical functions operate on a group of rows and return a single result for each row.
They can be used to calculate moving averages, running totals, rank, and percentiles.
Examples include ROW_NUMBER(), RANK(), DENSE_RANK(), LEAD(), LAG(), SUM(), AVG().
- Q4. What are triggers and how to create them and what is the use of triggers and explain when and how did you use triggers in your previous org
- Ans.
Triggers are database objects that automatically perform an action when a specified event occurs on a particular table or view.
Triggers are used to enforce business rules, validate data, and maintain data integrity.
They can be created using SQL commands like CREATE TRIGGER.
Triggers can be set to execute before or after INSERT, UPDATE, or DELETE operations on a table.
An example of using triggers is to automatically upda...
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(2 Questions)
- Q1. Introduction by my self
- Q2. Pyspark related getting the column names
Question on Probability and basic aptitude questions
(2 Questions)
- Q1. Question were related to Past projects
- Q2. SQL and Excel medium level questions
(1 Question)
- Q1. Sorting Question
Lead Data Scientist Interview Questions & Answers
JPMorgan Chase & Co.
Anonymous
posted on 14 Jun 2024
I applied via Referral and was interviewed in May 2024. There was 1 interview round.
(4 Questions)
- Q1. Given a variable, how to do Linear Regression?
- Ans.
Linear regression is a statistical method used to model the relationship between a dependent variable and one or more independent variables.
Collect data on the variables of interest
Plot the data to visualize the relationship between the variables
Choose a suitable linear regression model (simple or multiple)
Fit the model to the data using a regression algorithm (e.g. least squares)
Evaluate the model's performance using ...
- Q2. How Linear Regression handles noise?
- Ans.
Linear Regression minimizes noise by fitting a line that best represents the relationship between variables.
Linear Regression minimizes the sum of squared errors between the actual data points and the predicted values on the line.
It assumes that the noise in the data is normally distributed with a mean of zero.
Outliers in the data can significantly impact the regression line and its accuracy.
Regularization techniques l...
- Q3. Solve two equations to find coefficients?
- Ans.
Use linear algebra to solve for coefficients in two equations.
Set up the two equations with unknown coefficients
Solve the equations simultaneously using methods like substitution or elimination
Example: 2x + 3y = 10 and 4x - y = 5, solve for x and y
- Q4. Probability question on picking a red ball from Red, blue, black ball bag with replacement.
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Lead Data Analyst Interview Questions & Answers
Fidelity Investments
Anonymous
posted on 29 Jul 2024
(2 Questions)
- Q1. Talked about previous experience in detail.
- Q2. Asked some case studies regarding their products
Interview Preparation Tips
Selected
I applied via Referral and was interviewed in Oct 2024. There was 1 interview round.
Basic aptitude test like distance problem , age etc
Interview Preparation Tips
Data Analyst Interview Questions & Answers
State Street Corporation
Harshil Sojitra
posted on 27 May 2024
I applied via campus placement at Institute of Management Nirma University, Ahmedabad and was interviewed in Nov 2023. There were 2 interview rounds.
40 questions are there. The que have different categories. Reasoning , critical thinking
(3 Questions)
- Q1. Tell me about your self
- Q2. Question based on the resume
- Q3. What are the project you have done?
Interview Preparation Tips
- DSA
- Basic coding
I applied via Naukri.com and was interviewed in Apr 2024. There were 2 interview rounds.
(1 Question)
- Q1. Asked about skillsets & tools used in the current job. I was asked basic questions on SQL & Tableau
Detailed interview on SQL, Tableau & Alteryx
Study hard that's it
(1 Question)
- Q1. Tell me about yourself
Basics in aptitude to be studied
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Senior Software Engineer
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