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| date | user_id | purchase_amount |
|---|---|---|
| 2020-01-01 | 1 | 39 |
| 2020-01-04 | 1 | 39 |
| 2020-01-10 | 1 | 90 |
| 2020-01-15 | 1 | 90 |
SELECT 4
| date | user_id | purchase_amount |
|---|---|---|
| 2020-01-01 | 1 | 39 |
| 2020-01-04 | 1 | 39 |
| 2020-01-10 | 1 | 90 |
| 2020-01-15 | 1 | 90 |
SELECT 4