PySpark Dates

6 interview problems on parse, shift and compare dates, from easy to hard.

• Month Start, Month End and Due Dates · Medium · Dates
• Three-Day Login Streak · Hard · Window Functions
• Trailing 3 Calendar Days (Range Frame) · Hard · Window Functions
• Sessionize a Clickstream · Hard · Window Functions
• Fill Missing Dates (Calendar Spine) · Hard · Joins
• Monthly Retention by Cohort · Hard · Joins

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Topics: Window Functions · Joins · Aggregations · Pivot, Unpivot & Rollup · Arrays · Null Handling · Conditional Logic · Dates · Filtering & Selection · Strings

Difficulty: Easy · Medium · Hard · PySpark interview roadmap · All problems