Leetcode Problem 1841. League Statistics

1841. League Statistics

Leetcode Solutions

Aggregation and Conditional Logic

Use UNION ALL to combine home and away match results into a single result set, with columns for team_id, goals for, goals against, and points based on match outcomes.
Join the result set from step 1 with the Teams table to get team names.
Aggregate the results by team_id to calculate matches played, total points, goals for, goals against, and goal difference.
Order the final result by points (descending), goal difference (descending), and team name (ascending).
Select the required columns for the final output.

erDiagram
    Teams ||--o{ Matches : plays
    Teams {
        int team_id PK
        varchar team_name
    }
    Matches {
        int home_team_id PK
        int away_team_id PK
        int home_team_goals
        int away_team_goals
    }

Using Conditional Aggregation Without UNION

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Leetcode Problem 1841. League Statistics

Leetcode Solutions

Aggregation and Conditional Logic

Solution Idea

Query Steps

Code Implementation

Using Conditional Aggregation Without UNION

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