Symmetric Pairs in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

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In this post, you will find the solution for Symmetric Pairs in SQL-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Introduction To SQL

SQL stands for Structured Query Language. SQL is used to create, remove, alter the database and database objects in a database management system and to store, retrieve, update the data in a database. SQL is a standard language for creating, accessing, manipulating database management system. SQL works for all modern relational database management systems, like SQL Server, Oracle, MySQL, etc.

  • It is a standard language for Relational Database System. It enables a user to create, read, update and delete relational databases and tables.
  • All the RDBMS like MySQL, Informix, Oracle, MS Access and SQL Server use SQL as their standard database language.
  • SQL allows users to query the database in a number of ways, using English-like statements.

Link for the ProblemSymmetric Pairs SQl – Hacker Rank Solution

Symmetric Pairs SQl – Hacker Rank Solution

Problem:

You are given a table, Functions, containing two columns: and Y.

1443818798 51909e977d 1

Two pairs (X1, Y1) and (X2, Y2) are said to be symmetric pairs if X1 = Y2 and X2 = Y1.

Write a query to output all such symmetric pairs in ascending order by the value of X. List the rows such that X1 ≤ Y1.

Sample Input2

1443818693 b384c24e35 2

Sample Output

20 20
20 21
22 23
Symmetric Pairs SQl – Hacker Rank Solution
SELECT X, Y FROM FUNCTIONS F1
    WHERE EXISTS(SELECT * FROM FUNCTIONS F2 WHERE F2.Y = F1.X
    AND F2.X = F1.Y AND F2.X > F1.X) AND (X != Y)
UNION
SELECT X,Y FROM FUNCTIONS F1 WHERE X = Y AND 
    ((SELECT COUNT(*) FROM FUNCTIONS WHERE X = F1.X AND Y = F1.X) > 1)
      ORDER BY X;

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