Ipsos Data Engineer Interview Questions and Answers

1 easy sql and 1 easy python for 55 min

1 easy python and very hard sql for 1 hr 50 min

Q1. Mainly they focused on the answers you have written on round 2 and basic sql and pandas in python
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Q2. 1) write a join 2) implement left join using pandas
Ans. 
Answering a question on writing a join and implementing left join using pandas for Data Analyst role.
• To write a join, we need to identify the common column(s) between two tables and use the JOIN keyword in SQL.

• Example: SELECT * FROM table1 JOIN table2 ON table1.common_column = table2.common_column

• To implement left join using pandas, we can use the merge() function with how='left' parameter.

• Example: pd.merge(table1, tab
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1 hr exam it is easy to crack

A train running at the speed of 60 km/hr crosses a pole of 9 seconds. what is hte length of train?

Print all prime numbers

Q1. Python string is changable or not
Ans. 
Python strings are immutable, meaning they cannot be changed once created.
• Python strings are immutable, so any operation that appears to modify a string actually creates a new string object.

• For example, when you use string concatenation or slicing, a new string is created instead of modifying the original string.

• To modify a string in Python, you would need to create a new string with the desired changes.
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Q2. Sql window function ?
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Q3. Difference between having and where cause
Ans. 
HAVING is used with GROUP BY to filter groups, WHERE is used to filter rows
• HAVING is used with GROUP BY clause to filter the groups based on aggregate functions

• WHERE is used to filter rows based on conditions

• HAVING is applied after the GROUP BY clause, WHERE is applied before

• HAVING can only be used with SELECT statement that contains a GROUP BY clause

• Example: SELECT department, AVG(salary) FROM employees GROUP BY depar...read more
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Q4. Sql union and union all
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Q5. Python using remove duplicate value
Ans. 
Use Python's set() function to remove duplicate values from an array of strings.
• Convert the array to a set to automatically remove duplicates

• Convert the set back to a list if needed
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Moderate level MCQ questions

Asked moderate level guesstimates and puzzles in 2 round

Joins, windows function such as row_number, rank, dense rank

Q1. Why do. you want to join
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Q2. What are your career ambition
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