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CODE WORKSPACE
Return customer_id, old_tier, new_tier, old_valid_from, old_valid_to, new_valid_from, and new_valid_to.
Result columns · in this order
customer_idold_tiernew_tierold_valid_fromold_valid_tonew_valid_fromnew_valid_toHow to approach it
Join clean_stage to dim_customer_history where is_current = 1.
Sample input
| customer_id | old_tier | new_tier | updated_at |
|---|---|---|---|
| 101 | silver | gold | 2026-03-05 10:00:00 |
| 104 | gold | platinum | 2026-03-05 12:30:00 |
2 rows — all rows shown.
Expected output
| customer_id | old_tier | new_tier | old_valid_to | new_valid_from |
|---|---|---|---|---|
| 101 | silver | gold | 2026-03-04 | 2026-03-05 |
| 104 | gold | platinum | 2026-03-04 | 2026-03-05 |
2 rows — all rows shown.
Constraints
Use the latest staged non-deleted row per customer and only current history rows. Close the old row the day before date(updated_at), open the new row on date(updated_at), and order by customer_id.
Expected skills
SCD2 current-row checks and validity-window reasoning.
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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