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Tel het aantal bestellingen per bodemcode. Noem de kolom aantal_besteld. De gegevens komen uit tabel besteldepizza.
Bekijk de tabel besteldePizza
| besteldepizzacode | bodemcode | ... |
|---|---|---|
| 1 | 2 | ... |
| 2 | 2 | ... |
| 3 | 2 | ... |
| 4 | 2 | ... |
| 5 | 2 | ... |
| 6 | 2 | ... |
| 7 | 1 | ... |
| 8 | 2 | ... |
| ... | ... | ... |
| 17 | 3 | ... |
| ... | ... | ... |