Leetcode Problem 580. Count Student Number in Departments

580. Count Student Number in Departments

Leetcode Solutions

Using LEFT OUTER JOIN and COUNT to Report Department Student Numbers

Perform a LEFT OUTER JOIN on the Department and Student tables using dept_id as the join condition.
Use the COUNT function on student_id to count the number of students in each department, which correctly handles null values when there are no students in a department.
Group the results by dept_name to ensure the counts are calculated per department.
Order the results by student_number in descending order to get the departments with the most students first.
In case of a tie in student_number, order by dept_name alphabetically.

erDiagram
    Department ||--o{ Student : has
    Department {
        int dept_id PK
        varchar dept_name
    }
    Student {
        int student_id PK
        varchar student_name
        varchar gender
        int dept_id FK
    }

Using Subquery and LEFT JOIN to Report Department Student Numbers

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Leetcode Problem 580. Count Student Number in Departments

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Using LEFT OUTER JOIN and COUNT to Report Department Student Numbers

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Using Subquery and LEFT JOIN to Report Department Student Numbers

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