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17 changes: 17 additions & 0 deletions Case Study #2 - Pizza Runner/C. Ingredient Optimisation.md
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## Solution - C. Ingredient Optimisation

### 1. What are the standard ingredients for each pizza?
```sql
WITH recipe AS (
SELECT
pizza_id,
UNNEST(STRING_TO_ARRAY(toppings, ', ')::INT[]) AS toppings
FROM pizza_runner.pizza_recipes
)

SELECT
pizza_name, STRING_AGG(topping_name, ', ')
FROM recipe AS r
INNER JOIN pizza_runner.pizza_toppings AS t
ON t.topping_id = r.toppings
INNER JOIN pizza_runner.pizza_names AS n
ON r.pizza_id = n.pizza_id
GROUP BY pizza_name
```

### 2. What was the most commonly added extra?

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