+------+------+------+
| :sid | :pid | :qty |
+------+------+------+
| S1   | P1   |  300 |
| S1   | P2   |  200 |
| S1   | P3   |  400 |
| S1   | P4   |  200 |
| S1   | P5   |  100 |
| S1   | P6   |  100 |
| S2   | P1   |  300 |
| S2   | P2   |  400 |
| S3   | P2   |  200 |
| S4   | P2   |  200 |
| S4   | P4   |  300 |
| S4   | P5   |  400 |
+------+------+------+