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hotel_id | customer_id | visit_date | prev_vd | grp |
---|---|---|---|---|
1 | 1 | 2020-01-01 | null | 1 |
1 | 2 | 2020-01-03 | 2020-01-01 | 1 |
2 | 1 | 2020-01-01 | null | 1 |
2 | 2 | 2020-01-10 | 2020-01-01 | 2 |
2 | 3 | 2020-01-14 | 2020-01-10 | 3 |
3 | 1 | 2020-01-04 | null | 1 |
3 | 1 | 2020-01-11 | 2020-01-04 | 2 |