Citadel Data Scientist Data Manipulation (SQL/Python) Interview Questions
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Citadel
Medium
Data ScientistImplement Left Join Using Python Dictionaries Efficiently
Orders +---------+----------+--------+ | order_id| customer | amount | +---------+----------+--------+ | 101 | C1 | 250 | | 102 | ...
Data Manipulation (SQL/Python)
60
0
Jul 12, 2025
Citadel
Medium
Data ScientistImplement left join on Python lists, no packages
Implement a left join in pure Python (no external packages, no pandas). Input: left = list of dicts with key 'id' and arbitrary other fields; right = ...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025
Citadel
Medium
Data ScientistPerform EDA and diagnose data quality
Given a tabular dataset loaded into a pandas DataFrame, write code to perform exploratory data analysis end-to-end: inspect and report column data typ...
Data Manipulation (SQL/Python)
0
0
Aug 8, 2025