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CODE WORKSPACE
Return event_id, device, and campaign; missing campaign should be unknown.
Result columns · in this order
event_iddevicecampaignHow to approach it
Extract payload fields with explicit aliases.
Sample input
| event_id | payload |
|---|---|
| 1 | {"device":"ios","campaign":"winter"} |
| 3 | {"device":"web","campaign":"spring"} |
| 4 | {"device":"web","items":["SKU-C"]} |
| 6 | {"device":"ios"} |
4 rows — all rows shown.
Expected output
| event_id | device | campaign |
|---|---|---|
| 1 | ios | winter |
| 2 | ios | winter |
| 3 | web | spring |
| 4 | web | unknown |
| 5 | android | winter |
| 6 | ios | unknown |
6 rows — all rows shown.
Constraints
Use json_extract and COALESCE. Order by event_id.
Expected skills
JSON path extraction and missing-key defaults.
Submit for review to find out what your query gets right, what it gets wrong, and how it compares with the best working query for this exercise.
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