BillDesk Business Analyst Interview Questions and Answers

Q1. Joins outputs for various types of joins
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• 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 the right table

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table

• FU...read more
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Q2. Query using window functions
Ans. 
Window functions are used to perform calculations across a set of table rows related to the current row.
• Window functions are used in SQL to perform calculations on a set of rows related to the current row.

• They allow you to perform calculations like ranking, moving averages, and cumulative sums.

• Examples of window functions include ROW_NUMBER(), RANK(), and SUM() OVER().
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Sql and excel then tableu

Q1. Sql and excel and basic questions
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Q1. Longterm aspiration
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Quantitative aptitude, verbal ability, critical reasoning

Q1. SQL: find store with highest AOV
Ans. 
Use SQL query to find store with highest Average Order Value (AOV).
• Use GROUP BY clause to group by store

• Calculate AOV by dividing total revenue by total orders

• Use ORDER BY and LIMIT to find store with highest AOV
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Q2. Generic behavioural questions
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Q1. Sql round question were asked
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36 questions of cognitive ability

How social media is killing the creativity

Q1. What is the output of a GROUP BY statement on a column with unique values?
Ans. 
A GROUP BY statement on unique values returns the same unique values, often used for aggregation.
• GROUP BY aggregates data based on specified columns.

• If the column has unique values, each group will contain only one row.

• Example: SELECT column_name, COUNT(*) FROM table GROUP BY column_name; returns unique values with their counts.

• Useful for summarizing data, but no meaningful aggregation occurs with unique values.
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Q2. What is the output regarding the number of rows in left, right, and inner joins?
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Q1. SQL Queries for JOINS
Ans. 
SQL queries for JOINS
• Use INNER JOIN to retrieve rows from both tables that have matching values

• Use LEFT JOIN to retrieve all rows from the left table and the matched rows from the right table

• Use RIGHT JOIN to retrieve all rows from the right table and the matched rows from the left table

• Use FULL JOIN to retrieve rows when there is a match in either table
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Q2. QUERY FOR metrics given in the sheet
Ans. 
The query is asking for metrics provided in a specific sheet.
• Identify the specific sheet being referred to in the question

• Review the metrics listed in the sheet

• Analyze the relevance of each metric to the query
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This is a case study round revolve around a business problem in which we have to analyse data driven solutions.