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customers_snapshot is a dbt snapshot with dbt_valid_from and dbt_valid_to. Return customer_id, plan and dbt_valid_from for the row that was current on 2026-03-15. Order by customer_id.
Result columns · in this order
customer_id | Stable customer identifier. Appears once per version. |
plan | The plan that version of the customer was on. |
dbt_valid_from | When this version became true. Inclusive. |
How to approach it
Try WHERE dbt_valid_to IS NULL first and read the result. It answers a different question than the one you were asked.
Sample input
| customer_id | plan | dbt_valid_from | dbt_valid_to |
|---|---|---|---|
| 1 | free | 2026-01-10 | 2026-03-01 |
| 1 | pro | 2026-03-01 | 2026-04-02 |
| 1 | enterprise | 2026-04-02 | null |
| 2 | pro | 2026-02-14 | null |
| 3 | free | 2026-03-20 | null |
5 rows — all rows shown.
Expected output
| customer_id | plan | dbt_valid_from |
|---|---|---|
| 1 | pro | 2026-03-01 |
| 2 | pro | 2026-02-14 |
2 rows — all rows shown.
Constraints
A row is current at a moment when dbt_valid_from is on or before it AND dbt_valid_to is either after it or NULL. NULL means the row is still open. Order by customer_id.
Expected skills
Reading an SCD2 interval, why dbt_valid_to IS NULL only answers 'now', and the half-open interval that makes an as-of query correct.
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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