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In this post, you will find the solution for The Blunder 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 Problem – The Blunder SQL- Hacker Rank Solution
The Blunder SQL- Hacker Rank Solution
Problem:
Samantha was tasked with calculating the average monthly salaries for all employees in the EMPLOYEES table, but did not realize her keyboard’s key was broken until after completing the calculation. She wants your help finding the difference between her miscalculation (using salaries with any zeros removed), and the actual average salary.
Write a query calculating the amount of error (i.e.: average monthly salaries), and round it up to the next integer.
Input Format
The EMPLOYEES table is described as follows:
Note: Salary is per month.
Constraints
.
Sample Input
Sample Output
2061
Explanation
The table below shows the salaries without zeros as they were entered by Samantha:
Samantha computes an average salary of . The actual average salary is .
The resulting error between the two calculations is . Since it is equal to the integer , it does not get rounded up.
The Blunder SQL- Hacker Rank Solution
SELECT CEIL(AVG(Salary)-AVG(REPLACE(Salary,'0',''))) FROM EMPLOYEES
