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Toon van elk soort pizza (pizzacode) hoeveel er gemiddeld gelijktijdig besteld worden. Noem de kolom gemiddeld_aantal.
Bekijk de tabel besteldePizza
| besteldepizzacode | pizzacode | aantal | ... |
|---|---|---|---|
| 1 | 17 | 1 | ... |
| 2 | 8 | 1 | ... |
| 3 | 28 | 1 | ... |
| 4 | 27 | 3 | ... |
| 5 | 28 | 2 | ... |
| 6 | 32 | 3 | ... |
| 7 | 25 | 1 | ... |
| 8 | 5 | 3 | ... |
| 9 | 7 | 1 | ... |
| 10 | 9 | 2 | ... |
| ... | ... | ... | ... |