Leetcode Problem 1623. All Valid Triplets That Can Represent a Country

1623. All Valid Triplets That Can Represent a Country

Leetcode Solutions

Cross Join with Distinct Pairwise Filters

  1. Perform a cross join between SchoolA, SchoolB, and SchoolC to get all possible combinations of students.
  2. Apply a WHERE clause to filter out combinations where student_id or student_name is not distinct across the three students.
  3. Select the student_name from each table and alias them as member_A, member_B, and member_C for the final output.

erDiagram
    SchoolA {
        int student_id PK
        varchar student_name
    }
    SchoolB {
        int student_id PK
        varchar student_name
    }
    SchoolC {
        int student_id PK
        varchar student_name
    }

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