Interview Q&A / Data Science
Data Science interview questions
Statistics, pandas, cleaning data and exploratory analysis for analyst and data science roles.
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- How do you find rows in one DataFrame that have no match in another?
Use a left merge with indicator=True and keep rows marked left_only, or filter with ~isin on the key column. This is the pandas version of a SQL anti-join, useful for finding missing records.
IntermediateQuick answer1 min read