The Report in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

The Report SQL | Hackerrank Solution

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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 ProblemThe Report SQL – Hacker Rank Solution

The Report SQL – Hacker Rank Solution

Problem:

You are given two tables: Students and GradesStudents contains three columns IDName and Marks.

The Report

Grades contains the following data:

The Report

Ketty gives Eve a task to generate a report containing three columns: NameGrade and MarkKetty doesn’t want the NAMES of those students who received a grade lower than 8. The report must be in descending order by grade — i.e. higher grades are entered first. If there is more than one student with the same grade (8-10) assigned to them, order those particular students by their name alphabetically. Finally, if the grade is lower than 8, use “NULL” as their name and list them by their grades in descending order. If there is more than one student with the same grade (1-7) assigned to them, order those particular students by their marks in ascending order.

Write a query to help Eve.

Sample Input

The Report

Sample Output

Maria 10 99
Jane 9 81
Julia 9 88 
Scarlet 8 78
NULL 7 63
NULL 7 68


Note

Print “NULL”  as the name if the grade is less than 8.

Explanation

Consider the following table with the grades assigned to the students:

1443818026 0b3af8db30 4

So, the following students got 89 or 10 grades:

  • Maria (grade 10)
  • Jane (grade 9)
  • Julia (grade 9)
  • Scarlet (grade 8)
The Report SQL – Hacker Rank Solution
SELECT IF(g.Grade<8, NULL, s.Name), g.Grade, s.Marks FROM Students AS s 
JOIN Grades AS g ON s.Marks BETWEEN g.Min_Mark AND g.Max_Mark ORDER BY g.Grade DESC, s.Name, s.Marks;

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