Business Intelligence Engineer Interview Questions and Answers

Churn rate is the percentage of customers who stop using a product or service over a certain period of time. Customer conversion rate is the percentage of potential customers who take a desired action, such as making a purchase.

• Churn rate measures customer retention and loyalty.

• Customer conversion rate measures the effectiveness of marketing and sales efforts.

• Churn rate can be calculated by dividing the number of customers lost during a period by the total number of customers...read more

Query to retrieve the first order for each customer in 2021

• Use a subquery to find the minimum order date for each customer in 2021

• Join the subquery with the main table on customer ID and order date to get the first order

S3 and Lambda can be connected using S3 event notifications to trigger Lambda functions.

• Set up an S3 bucket and create a Lambda function

• Configure the S3 bucket to send event notifications to the Lambda function

• Define the event type and prefix/suffix for triggering the Lambda function

• Lambda function will be automatically triggered when the specified event occurs in the S3 bucket

I have extensive experience with SQL, Python, and BI tools such as Tableau and Power BI.

• Proficient in writing complex SQL queries for data extraction and analysis

• Skilled in Python programming for data manipulation and automation tasks

• Experience in creating interactive dashboards and reports using BI tools like Tableau and Power BI