Pie charts are a useful visualization for representing proportions of a whole, with the size of each wedge or
sector of the circle conveying the contribution of a given category.
Pie charts are especially effective in visually conveying percentage values of a total.
Your SQL query should return the results follows this structure
- Label: Label info about this row
- Value: The actual value
In the below example, the 'City' column uses the string data type, and the 'Reservations' column uses the number data type.