Leetcode Problem 1479. Sales by Day of the Week

1479. Sales by Day of the Week

Leetcode Solutions

Pivot Table with Conditional Aggregation

Perform a RIGHT JOIN between the Orders and Items tables on the item_id column to include all categories, even those without orders.
Use the WEEKDAY function to determine the day of the week for each order_date.
Use the SUM function with a CASE statement inside to conditionally sum the quantity for each day of the week.
Group the results by item_category.
Order the final result by item_category.
Select the item_category and the conditional sums for each day of the week as the final output.

erDiagram
    Orders {
        int order_id
        int customer_id
        date order_date
        varchar item_id
        int quantity
    }
    Items {
        varchar item_id
        varchar item_name
        varchar item_category
    }
    Orders }|--|| Items : ""

Pandas GroupBy and Unstack

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Leetcode Problem 1479. Sales by Day of the Week

Leetcode Solutions

Pivot Table with Conditional Aggregation

Solution Idea

Query Steps

Code Implementation

Pandas GroupBy and Unstack

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