BI Engineer
BI Engineer Interview Questions and Answers
Q1. which classification model you used to build this project mentioned in ur cv
I used a Random Forest classification model to build the project mentioned in my CV.
Random Forest is an ensemble learning method that builds multiple decision trees and merges them together to get a more accurate and stable prediction.
It is commonly used for classification tasks in machine learning.
Random Forest can handle large data sets with higher dimensionality and is less prone to overfitting compared to a single decision tree model.
Q2. Difference b/w cte & temp table in sql & their use case
CTE is a temporary result set defined within a query, while temp table is a physical table created in tempdb for temporary storage.
CTE stands for Common Table Expression and is defined within a query using the WITH keyword
CTEs are mainly used for recursive queries, complex queries, or to improve readability of the query
Temp tables are physical tables created in tempdb for temporary storage of data
Temp tables are useful when you need to store intermediate results for further p...read more
Q3. describe data validation processes
Data validation processes ensure data accuracy and consistency.
Performing range checks to ensure data falls within expected values
Checking for data type consistency (e.g. ensuring a field is always a number)
Validating data against predefined rules or constraints
Identifying and handling missing or duplicate data
Implementing data cleansing techniques to improve data quality
Q4. etl processes describe
ETL processes involve extracting data from various sources, transforming it to fit business needs, and loading it into a target database.
Extract data from multiple sources such as databases, files, APIs, etc.
Transform the data by cleaning, filtering, aggregating, and structuring it.
Load the transformed data into a target database or data warehouse.
ETL tools like Informatica, Talend, and SSIS are commonly used for these processes.
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