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| category | sales_volume | return_volume | return_rate |
|---|---|---|---|
| CAT_01 | 500 | null | null |
| CAT_01 | null | 450 | null |
| CAT_02 | 700 | null | null |
| CAT_02 | null | 670 | null |
| category | sales_volume | return_volume | return_rate |
|---|---|---|---|
| CAT_01 | 500 | null | null |
| CAT_01 | null | 450 | null |
| CAT_02 | 700 | null | null |
| CAT_02 | null | 670 | null |