Wissen Technologies Interview Questions (With Answers)

6 Questions asked

Oct 2026 First seen

Oct 2026 Last seen

6 Unique questions

🥧 Difficulty mix

How hard are these questions?

Easy 4 (67%)Medium 2 (33%)

📊 Question type

Breakdown by interview phase

🔥 12-week activity

When candidates are asked these

Last 12 weeks →

🏷️ Top topics

Where these questions cluster

Python 4

Sql 3

Joins 1

Aggregations 1

Window Functions 1

Data Structures 1

Collections 1

Debugging 1

👤 Experience level mix

What seniority these are asked at

Fresher (0-1yr) 1Junior (1-3yr) 3Mid (3-6yr) 2

📝 Recent questions

Latest 10 asked by candidates

🟡 Medium ✅

Explain how to use LEFT JOIN with COALESCE to handle NULL manager names, write a query to find employees with salary greater than the average salary, write a query to sum values with HAVING > 100000, and explain the difference between RANK() and DENSE_RANK().

Sql Joins Aggregations Window Functions

Conceptual · Asked 2× · Oct 2026

🟢 Easy ✅

How would you count the occurrences of each fruit in a list using a for loop or collections.Counter in Python?

Python Data Structures Collections

Coding · Asked 2× · Oct 2026

🟢 Easy ✅

Why does the code raise a KeyError when accessing player['Name'] instead of player['name']?

Python Debugging Dictionaries

Debugging · Asked 2× · Oct 2026

🟡 Medium ✅

What is the difference between using DISTINCT and using GROUP BY with HAVING COUNT > 1 in SQL queries?

Sql Distinct Group By Aggregation

Conceptual · Asked 2× · Oct 2026

🟢 Easy ✅

How do you reverse a string in Python using slicing and using a for loop?

Python String Manipulation Slicing

Conceptual · Asked 2× · Oct 2026

🟢 Easy ✅

Can you introduce yourself, state your years of experience, and rate your proficiency in Python and SQL?

Behavioral Self-introduction Python Sql

Behavioral · Asked 2× · Oct 2026

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