Placements SQl in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank of Programming Language SQL. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Placements SQl 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 ProblemPlacements SQL – Hacker Rank Solution

Placements SQL – Hacker Rank Solution

Problem:

You are given three tables: Students, Friends and Packages. Students contains two columns: ID and NameFriends 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).

1443820186 2a9b4939a8 1

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

1443820079 9bd1e231b1 2 1
1443820100 adb691b2f5 2 2

Sample Output

Samantha
Julia
Scarlet


Explanation

See the following table:

1443819966 c37c146d27 3

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
Placements SQL – Hacker Rank Solution
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;

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