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| week | product | sale | productpreviousweeksales |
|---|---|---|---|
| 1 | ABC | 2 | null |
| 1 | ABC | 1 | null |
| 2 | ABC | 1 | 3 |
| 3 | ABC | 5 | 1 |
| 4 | ABC | 1 | 5 |
| 2 | DEF | 5 | null |
| 3 | DEF | 1 | 5 |
| 3 | DEF | 2 | 5 |