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| author | title | price | amount |
|---|---|---|---|
| 1 | title11 | 150 | 30 |
| 1 | title12 | 150 | 30 |
| 1 | title13 | 100 | 30 |
| 1 | title14 | 200 | 30 |
| 2 | title15 | 0 | 20 |
| 3 | title16 | 50 | 20 |
| 3 | title17 | 1 | 10 |
| 2 | title18 | 1000 | 21 |
| 2 | title19 | 0 | 22 |
| author | Стоимость |
|---|---|
| 2 | 21000 |
| 1 | 18000 |