task NULL handling · warm-up
Orders with no delivery date
Return the id and status of every order whose delivered_date is missing.
what to return
- Columns
idstatusin this order- Rows
- 9 rows · any order
- Watch for
- Look at delivered_date itself — one delivered order is missing its date, and it should be included.
- Skill
- Find missing values with IS NULL. Refresher: Understand NULL →
expected result
Your query should return exactly these columns and values. Run it and compare.
expected result9 rows · any order
| id | status |
|---|---|
| 104 | cancelled |
| 110 | shipped |
| 112 | delivered |
first 3 of 9 rows
data you can query
Sample rows from each table. Each column shows its type underneath; → marks a link to another table.
sales_orders5 columns · 33 rows
| idinteger · key | shopper_idinteger → shoppers | order_datetext | statustext | delivered_datetext |
|---|---|---|---|---|
| 101 | 1 | 2025-01-04 | delivered | 2025-01-08 |
| 102 | 2 | 2025-01-06 | delivered | 2025-01-07 |
| 103 | 1 | 2025-01-15 | delivered | 2025-01-20 |
| 104 | 3 | 2025-01-18 | cancelled | NULL |
| 105 | 4 | 2025-01-22 | delivered | 2025-01-31 |
showing 5 of 33 rows
solution.sql
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