Deduplication

Real data has duplicates; the interview tests whether you can define "duplicate"

Real data has duplicates; the interview tests whether you can define "duplicate"

Category

SQL

Difficulty

advanced

Duration

25 minutes

Challenges

0 hands-on challenges

Topics covered: "Remove Duplicates" Requires a Definition, ROW_NUMBER Deduplication, DISTINCT vs GROUP BY vs ROW_NUMBER, Time-Window and Fuzzy Deduplication, Deduplication as a Pipeline Stage

Lesson Sections

1. "Remove Duplicates" Requires a Definition

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2. ROW_NUMBER Deduplication

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3. DISTINCT vs GROUP BY vs ROW_NUMBER

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4. Time-Window and Fuzzy Deduplication

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5. Deduplication as a Pipeline Stage

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