djeada / sql-hackerrank

Solutions to HackerRank SQL problems.

Sql-HackerRank

Solutions to HackerRank SQL problems.

Prerequisites

You will need access to a database as well as the MySQL interpreter. You may either install them locally or use one of the online interpreters.

Installing MySQL locally

There are several methods for installing MySQL directly on your machine. I would recommend that you use Docker.

Online interpreters

There are several websites that provide online MySQL interpreters that do not require a login or registration. This website is one of them.

Basic Select

#	Title	Solution
1	Employee Names	sql
2	Employee Salaries	sql
3	Higher Than 75 Marks	sql
4	Revising the Select Query I	sql
5	Revising the Select Query II	sql
6	Select All	sql
7	Select By ID	sql
8	Japanese Cities' Attributes	sql
9	Japanese Cities' Names	sql
10	Weather Observation Station 1	sql
11	Weather Observation Station 3	sql
12	Weather Observation Station 4	sql
13	Weather Observation Station 5	sql
14	Weather Observation Station 6	sql
15	Weather Observation Station 7	sql
16	Weather Observation Station 8	sql
17	Weather Observation Station 9	sql
18	Weather Observation Station 10	sql
19	Weather Observation Station 11	sql
20	Weather Observation Station 12	sql

Advanced Select

#	Title	Solution
1	Type of Triangle	sql
2	The PADS	sql
3	Occupations	sql
4	Binary Tree Nodes	sql
5	New Companies	sql

Aggregation

#	Title	Solution
1	Revising Aggregations - The Count Function	sql
2	Revising Aggregations - The Sum Function	sql
3	Revising Aggregations - Averages	sql
4	Average Population	sql
5	Japan Population	sql
6	Population Density Difference	sql
7	The Blunder	sql
8	Top Earners	sql
9	Weather Observation Station 2	sql
10	Weather Observation Station 13	sql
11	Weather Observation Station 14	sql
12	Weather Observation Station 15	sql
13	Weather Observation Station 16	sql
14	Weather Observation Station 17	sql
15	Weather Observation Station 18	sql
16	Weather Observation Station 19	sql
17	Weather Observation Station 20	sql

Basic Join

#	Title	Solution
1	Population Census	sql
2	African Cities	sql
3	Average Population of Each Continent	sql
4	The Report	sql
5	Top Competitors	sql
6	Ollivander's Inventory	sql
7	Challenges	sql
8	Contest Leaderboard	sql

Advanced Join

#	Title	Solution
1	SQL Project Planning	sql
2	Placements	sql
3	Symmetric Pairs	sql
4	Interviews	sql
5	15 Days of Learning SQL	sql

Alternative Queries

#	Title	Solution
1	Draw The Triangle 1	sql
2	Draw The Triangle 2	sql
3	Print Prime Numbers	sql