Placements in SQL | HackerRank Solution

Hello coders, today we are going to solve Placements HackerRank Solution in SQL.

Problem

You are given three tables: Students, Friends and Packages. Students contains two columns: ID and Name. Friends contains two columns: ID and Friend_ID (ID of the ONLY best friend). Packages contains two columns: ID and Salary (offered salary in $ thousands per month).

Column	Type
ID	Integer
Name	String

Column	Type
ID	Integer
Friend_ID	Integer

Column	Type
ID	Integer
Salary	Float

Write a query to output the names of those students whose best friends got offered a higher salary than them. Names must be ordered by the salary amount offered to the best friends. It is guaranteed that no two students got same salary offer.

Sample Input

ID	Friend_Id
1	2
2	3
3	4
4	1

ID	Name
1	Ashley
2	Samantha
3	Julia
4	Scarlet

ID	Name
1	15.20
2	10.06
3	11.55
4	12.12

Sample Output

Samantha
Julia
Scarlet

Explanation

Now,

• Samantha’s best friend got offered a higher salary than her at 11.55
• Julia’s best friend got offered a higher salary than her at 12.12
• Scarlet’s best friend got offered a higher salary than her at 15.2
• Ashley’s best friend did NOT get offered a higher salary than her

The name output, when ordered by the salary offered to their friends, will be:

• Samantha
• Julia
• Scarlet

Solution – Placements in SQL

MySQL

select temp1.sn
from (select S.ID si,S.Name sn,P.Salary ps from Students S join Packages P on S.ID=P.ID) temp1 join (select FF.ID fi,FF.Friend_ID fd,PP.Salary pps from Friends FF join Packages PP on FF.Friend_ID=pp.ID) temp2 on temp1.si=temp2.fi and temp1.ps<temp2.pps
order by temp2.pps asc;

Disclaimer: The above Problem (Placements) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.