Wells Fargo
10+ Avniro Group Interview Questions and Answers
Q1. What are the different types of Join used in SQL?
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
Q2. Componets of Tableau ? What are the different connection is there in Tableau ?
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
ODBC connection: Connects to databases using ODBC drivers
Cl...read more
Q3. What is the meaning of Trigger in Python?
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, and database events.
Q4. What is the meaning of Data Aggregation?
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 sales by region, average customer age, or sum of website ...read more
Q5. What is subquary ? Why it is required ?
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 condition, and joining tables.
Q6. Explain end to end data solution and how did you handle a challenging or difficult situation in current role ?
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 discrepancies in data sources by collaborating with IT team
Q7. 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 be a p...
read moreI 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 forecasting and customer segmentation
Managed development life cycle ...read more
Q8. Delete duplicate Records in SQL
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.
Q9. 1. Macro quoting functions in SAS 2. ways to create macro variable in Data step 3. date functions-intck() and intnx() 4.situational scenario based questions 5.Automatic variables in SAS
The interview questions cover topics such as macro quoting functions, creating macro variables, date functions, situational scenario-based questions, and automatic variables in SAS.
Macro quoting functions in SAS allow for the creation of macro variables with special characters.
Macro variables can be created in the data step using the %LET statement or by using the CALL SYMPUTX routine.
The date functions INTCK() and INTNX() are used to calculate the interval between two dates ...read more
Q10. What is Random forest
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 popular machine learning algorithm used in various fields such...read more
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