Weather Observation Station 20 in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

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In this post, you will find the solution for Weather Observation Station 20 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 ProblemWeather Observation Station 20 sql – Hacker Rank Solution

Weather Observation Station 20 sql – Hacker Rank Solution

Problem:

median is defined as a number separating the higher half of a data set from the lower half. Query the median of the Northern Latitudes (LAT_N) from STATION and round your answer to 4 decimal places.

Input Format

The STATION table is described as follows:

1449345840 5f0a551030 Station

where LAT_N is the northern latitude and LONG_W is the western longitude.

Weather Observation Station 20 sql – Hacker Rank Solution
SET @rowIndex := -1;
SELECT ROUND(AVG(t.LAT_N), 4) FROM
(
SELECT @rowIndex := @rowIndex+1 AS rowIndex, s.LAT_N FROM STATION AS s ORDER BY s.LAT_N
) AS t
WHERE t.rowIndex IN (FLOOR(@rowIndex / 2), CEIL(@rowIndex / 2));

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