Dunzo Analyst Intern Interview Questions and Answers

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Q1. Questions related to Advanced MS Excel, Basic SQL Queries.
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Q2. Count total no. of cities ?
Ans. 
The total number of cities cannot be counted without specific data or context.
• The total number of cities can vary depending on the country, region, or dataset being considered.

• One would need a list of cities or a specific area of focus to accurately count the total number of cities.

• For example, the total number of cities in the United States is different from the total number of cities in India.
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Q3. What is Index and Match ?
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Index and Match are functions in Excel used to lookup values in a table based on specific criteria.
• Index function returns the value of a cell in a table based on the row and column number provided.

• Match function returns the position of a value in a range.

• Index and Match functions are often used together to perform more flexible lookups than VLOOKUP or HLOOKUP.

• Example: =INDEX(A1:D10, MATCH(123, B1:B10, 0), 3) will retur...read more
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Q4. What is Vlookup and Hlookup ?
Ans. 
Vlookup and Hlookup are functions in Excel used to search for a value in a table and return a corresponding value.
• Vlookup stands for vertical lookup and is used to search for a value in the first column of a table and return a value in the same row from a specified column.

• Hlookup stands for horizontal lookup and is used to search for a value in the first row of a table and return a value in the same column from a speci...read more
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Q5. How to calculate Vlookup?
Ans. 
Vlookup is a function in Excel used to search for a value in a table and return a corresponding value.
• Use the formula =VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup])

• lookup_value is the value to search for in the first column of the table

• table_array is the range of cells that contains the data

• col_index_num is the column number in the table from which to retrieve the data

• range_lookup is optional and ca...read more
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Q1. Rank Function Application in Google Sheet?
Ans. 
Rank function in Google Sheets is used to assign a rank to a value in a list based on its order.
• Rank function is used to determine the rank of a value in a list.

• It can be used to rank values in ascending or descending order.

• The syntax for the rank function is RANK(value, range, [is_ascending]).
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Q2. Joins From SQL?
Ans. 
Joins in SQL are used 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.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;
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Q3. Order Of query execution in SQL?
Ans. 
The order of query execution in SQL is: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.
• FROM: Specifies the tables from which data will be retrieved.

• WHERE: Filters the rows based on specified conditions.

• GROUP BY: Groups the rows based on specified columns.

• HAVING: Filters the groups based on specified conditions.

• SELECT: Retrieves the columns specified in the query.

• ORDER BY: Sorts the result set based on specified column
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Q4. Write a query to find out students has greater than 80 marks and from English subject?
Ans. 
Query to find students with over 80 marks in English subject
• Use SELECT statement to retrieve data

• Filter the results using WHERE clause for marks greater than 80

• Include condition for English subject using AND operator
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Q1. When we use having clause ?
Ans. 
HAVING clause is used in SQL to filter groups based on specified conditions after GROUP BY clause.
• HAVING clause is used with GROUP BY clause to filter groups based on specified conditions.

• It is used to filter the results of aggregate functions like COUNT, SUM, AVG, etc.

• It is used to apply conditions to groups, similar to WHERE clause which applies conditions to individual rows.

• Example: SELECT department, AVG(salary) FR...read more
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Q2. Aggregate Function Application?
Ans. 
Aggregate functions are used to perform calculations on groups of rows in a table.
• Aggregate functions include SUM, AVG, COUNT, MIN, and MAX.

• They are commonly used in SQL queries to summarize data.

• For example, you can use SUM to calculate the total sales for a specific product.

• Another example is using AVG to find the average salary of employees in a department.
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Q3. Group by and order By?
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Q4. Write a query employes join between such dates?
Ans. 
Use a SQL query with JOIN to retrieve employees between specified dates.
• Use the JOIN keyword to combine data from two tables

• Specify the date range using the WHERE clause

• Example: SELECT * FROM employees e JOIN dates d ON e.date = d.date WHERE d.date BETWEEN '2022-01-01' AND '2022-12-31'
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