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Return exactly customer_id, email, tier, is_deleted, and load_action for staged rows whose action is not unchanged.
Result columns · in this order
customer_idemailtieris_deletedload_actionHow to approach it
Reuse the action-plan CTE, then filter load_action != 'unchanged'.
Sample input
| customer_id | stage_tier | target_tier | is_deleted |
|---|---|---|---|
| 101 | gold | silver | 0 |
| 102 | silver | null | 0 |
| 103 | bronze | bronze | 1 |
| 104 | platinum | gold | 0 |
| 105 | bronze | bronze | 0 |
| 106 | silver | null | 0 |
6 rows — all rows shown.
Expected output
| customer_id | tier | is_deleted | load_action | |
|---|---|---|---|---|
| 101 | ana@example.com | gold | 0 | update |
| 102 | ben@example.com | silver | 0 | insert |
| 103 | cy@example.com | bronze | 1 | delete_candidate |
| 104 | dee@example.com | platinum | 0 | update |
| 106 | fay@example.com | silver | 0 | insert |
5 rows — all rows shown.
Constraints
Dedupe the staged source first. Compare against dim_customer_current. Include insert, update, and delete_candidate rows. Exclude unchanged customer 105. Order by customer_id.
Expected skills
Clean merge-source construction and exclusion of no-op rows.
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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