Topic
Data Engineering problems
50 problems: 20 easy, 23 medium, 7 hard.
Easy (20)
- Deduplicate Preserving Order
- Cumulative Total
- Flatten 2D Array
- Tally Occurrences
- Backward-Fill Nulls
- Coalesce Columns
- Drop Nulls
- Chunk Array
- Cumulative Minimum
- Cumulative Product
- Consecutive Differences
- Lag Shift
- Percent of Total
- Replace Values
- Select Columns
- Count Nulls
- Deduplicate Adjacent
- Filter Greater Than
- Interleave Arrays
- Cumulative Distinct Count
Medium (23)
- Forward-Fill Nulls
- Sliding Window Sum
- Extract Column
- Transpose 2D Matrix
- Group Sum by Key
- Parse Config Pairs
- Inner Join
- Group By Average
- Run-Length Encoding
- Deduplicate by Latest Timestamp
- Left Join
- Anti-Join
- Union Distinct
- Set Intersection
- Set Difference
- Group By Max
- Group By Min
- Top-N Per Group
- Dense Rank
- Grouped Cumulative Sum
- Bucketize
- Melt (Unpivot)
- Sessionize Events