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| date | qty_prod_a | qty_prod_b | qty_prod_c |
|---|---|---|---|
| 2013-01-01 | 100 | 200 | 300 |
| 2013-01-02 | 101 | 0 | 301 |
| 2013-01-03 | 102 | 202 | 302 |
| date | qty_prod_a | qty_prod_b | qty_prod_c |
|---|---|---|---|
| 2013-01-01 | 100 | 200 | 300 |
| 2013-01-02 | 101 | 0 | 301 |
| 2013-01-03 | 102 | 202 | 302 |