27 questions · 27 match your filters
| Status | Title | Technology | Topic | Acceptance | Difficulty |
|---|---|---|---|---|---|
| ○ | 1.Deduplicate customers, keep latest record | PySpark | Window functions | 0.0% | Medium |
| ○ | 15.Find duplicate invoices | SQL | Deduplication | 12.5% | Easy |
| ○ | 2.Rolling 7-day active users | SQL | Window functions | — | Medium |
| ○ | 3.Broadcast join threshold tuning | PySpark | Broadcast join | — | Hard |
| ○ | 4.Skew-safe join on order_id | PySpark | Partitioning | — | Hard |
| ○ | 5.Top N products per category | SQL | Aggregation | — | Easy |
| ○ | 6.Delta Lake MERGE with schema evolution | Databricks | Delta Lake | — | Hard |
| ○ | 7.Flatten nested JSON into a fact table | Python | Data modeling | — | Medium |
| ○ | 8.Sessionize clickstream events | SQL | Window functions | — | Hard |
| ○ | 9.Detect late-arriving dimension rows | Data Engineering | Data modeling | — | Medium |
| ○ | 10.Repartition before a wide write | Spark | Partitioning | — | Medium |
| ○ | 11.Incremental load with watermarks | Databricks | Streaming | — | Medium |