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The Change Tracker
A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- medium
- Seniority
- junior, mid, senior
Problem
Our data warehouse tracks slowly changing dimensions. Write a function called detect_changes that takes two lists of dictionaries (old records and new records). Each dictionary has an 'id' key. Return a dictionary with three keys: 'added' (ids in new but not old), 'removed' (ids in old but not new), and 'modified' (ids in both where any other field differs). Each value should be a sorted list of ids.
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