Leetcode Problem 1715. Count Apples and Oranges

1715. Count Apples and Oranges

Leetcode Solutions

Using LEFT JOIN and COALESCE to Aggregate Fruit Counts

Perform a LEFT JOIN on the Boxes table with the Chests table using the chest_id as the joining key.
Use the COALESCE function to substitute a 0 for any null values resulting from the LEFT JOIN (i.e., when a box does not contain a chest).
Sum the apple and orange counts from the Boxes table and the corresponding counts from the Chests table (if any) to get the total counts.
Return the total apple and orange counts as the final result.

erDiagram
    Boxes ||--o{ Chests : contains
    Boxes {
        int box_id PK
        int chest_id FK
        int apple_count
        int orange_count
    }
    Chests {
        int chest_id PK
        int apple_count
        int orange_count
    }

Aggregating Fruit Counts with UNION and GROUP BY

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Leetcode Problem 1715. Count Apples and Oranges

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Using LEFT JOIN and COALESCE to Aggregate Fruit Counts

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Aggregating Fruit Counts with UNION and GROUP BY

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