Data Scientist
SQL questions
19 questions on SQL for data scientists, easiest first.
Easy 5
Medium 9
- Latest order per customermedium
- Row count after a mergemedium
- Ranking with ties in SQLmedium
- NOT IN returns no rowsmedium
- Customers who never orderedmedium
- Showing UTC timestamps in Dubai timemedium
- Catching duplicate keys in a mergemedium
- Dates like 03/04/2026 in an Indian filemedium
- Columns called price_x and price_ymedium