The Blunder in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

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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 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:

1443817108 adc2235c81 1

Note: Salary is per month.

Constraints

.

Sample Input

1443817161 299cc6eb7f 2

Sample Output

2061

Explanation

The table below shows the salaries without zeros as they were entered by Samantha:

1443817229 eb00d44a3b 3

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

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