{"id":25019679,"url":"https://github.com/djeada/sql-hackerrank","last_synced_at":"2026-01-08T21:03:57.498Z","repository":{"id":114372296,"uuid":"401153898","full_name":"djeada/Sql-HackerRank","owner":"djeada","description":" Solutions to HackerRank SQL problems. 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Sql-HackerRank\n\nSolutions to HackerRank SQL problems.\n\n![Capture](https://user-images.githubusercontent.com/37275728/186156193-5aaef426-955d-4246-9d26-04b14d093f62.PNG)\n\n## Prerequisites\n \nYou will need access to a database as well as the MySQL interpreter.\nYou may either install them locally or use one of the online interpreters. \n\n### Installing MySQL locally\n\nThere are several methods for installing MySQL directly on your machine.\nI would recommend that you use Docker. \n\n### Online interpreters\n\nThere are several websites that provide online MySQL interpreters that do not require a login or registration.\nThis \u003ca href=\"https://onecompiler.com/mysql\"\u003ewebsite\u003c/a\u003e is one of them. \n \n## Basic Select\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/name-of-employees/problem\"\u003eEmployee Names\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/employee_names.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/salary-of-employees/problem\"\u003eEmployee Salaries\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/employee_salaries.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/more-than-75-marks/problem\"\u003eHigher Than 75 Marks\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/higher_than_75_marks.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e4\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/revising-the-select-query/problem\"\u003eRevising the Select Query I\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/revising_the_select_query_i.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e5\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/revising-the-select-query-2/problem\"\u003eRevising the Select Query II\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/revising_the_select_query_ii.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e6\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/select-all-sql/problem\"\u003eSelect All\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/select_all.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e7\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/select-by-id/problem\"\u003eSelect By ID\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/select_by_id.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e8\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/japanese-cities-attributes/problem\"\u003eJapanese Cities' Attributes\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/japanese_cities_attributes.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e9\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/japanese-cities-name/problem\"\u003eJapanese Cities' Names\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/japanese_cities_names.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e10\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-1/problem\"\u003eWeather Observation Station 1\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_1.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e11\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-3/problem\"\u003eWeather Observation Station 3\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_3.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e12\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-4/problem\"\u003eWeather Observation Station 4\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_4.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e13\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-5/problem\"\u003eWeather Observation Station 5\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_5.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e14\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-6/problem\"\u003eWeather Observation Station 6\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_6.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e15\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-7/problem\"\u003eWeather Observation Station 7\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_7.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e16\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-8/problem\"\u003eWeather Observation Station 8\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_8.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e17\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-9/problem\"\u003eWeather Observation Station 9\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_9.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e18\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-10/problem\"\u003eWeather Observation Station 10\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_10.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e19\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-11/problem\"\u003eWeather Observation Station 11\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_11.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e20\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-12/problem\"\u003eWeather Observation Station 12\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_select/weather_observation_station_12.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n\n## Advanced Select\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/what-type-of-triangle/problem\"\u003eType of Triangle\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_select/type_of_triangle.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/the-pads/problem\"\u003eThe PADS\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_select/the_pads.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/occupations/problem\"\u003eOccupations\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_select/occupations.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e4\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/binary-search-tree-1/problem\"\u003eBinary Tree Nodes\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e5\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/the-company/problem\"\u003eNew Companies\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_select/new_companies.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n\n## Aggregation\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/revising-aggregations-the-count-function/problem\"\u003eRevising Aggregations - The Count Function\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/revising_aggregations_the_count_function.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/revising-aggregations-sum/problem\"\u003eRevising Aggregations - The Sum Function\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/revising_aggregations_the_sum_function.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/revising-aggregations-the-average-function/problem\"\u003eRevising Aggregations - Averages\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/revising_aggregations_averages.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e4\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/average-population/problem\"\u003eAverage Population\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/average_population.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e5\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/japan-population/problem\"\u003eJapan Population\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/japan_population.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e6\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/population-density-difference/problem\"\u003ePopulation Density Difference\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/population_density_difference.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e7\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/the-blunder/problem\"\u003eThe Blunder\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/the_blunder.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e8\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/earnings-of-employees/problem\"\u003eTop Earners\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/top_earners.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e9\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-2/problem\"\u003eWeather Observation Station 2\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_2.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e10\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-13/problem\"\u003eWeather Observation Station 13\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_13.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e11\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-14/problem\"\u003eWeather Observation Station 14\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_14.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e12\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-15/problem\"\u003eWeather Observation Station 15\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_15.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e13\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-16/problem\"\u003eWeather Observation Station 16\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_16.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e14\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-17/problem\"\u003eWeather Observation Station 17\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_17.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e15\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-18/problem\"\u003eWeather Observation Station 18\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_18.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e16\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-19/problem\"\u003eWeather Observation Station 19\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_19.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e17\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/weather-observation-station-20/problem\"\u003eWeather Observation Station 20\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/aggregation/weather_observation_station_20.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n\n## Basic Join\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/asian-population/problem\"\u003ePopulation Census\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/population_census.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/african-cities/problem\"\u003eAfrican Cities\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/african_cities.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/average-population-of-each-continent/problem\"\u003eAverage Population of Each Continent\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/challanges.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e4\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/the-report/problem\"\u003eThe Report\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/the_report.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e5\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/full-score/problem\"\u003eTop Competitors\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/the_competitors.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e6\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/harry-potter-and-wands/problem\"\u003eOllivander's Inventory\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/ollivanders_inventory.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e7\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/challenges/problem\"\u003eChallenges\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/challanges.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e8\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/contest-leaderboard/problem\"\u003eContest Leaderboard\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/basic_join/contest_leaderboard.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n\n## Advanced Join\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/sql-projects/problem\"\u003eSQL Project Planning\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_join/project_planning.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/placements/problem\"\u003ePlacements\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_join/placement.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/symmetric-pairs/problem\"\u003eSymmetric Pairs\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_join/symmetric_pairs.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e4\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/interviews/problem\"\u003eInterviews\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_join/interviews.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e5\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/15-days-of-learning-sql/problem\"\u003e15 Days of Learning SQL\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/advanced_join/15_days_of_learning.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n\n\n## Alternative Queries\n\n\u003ctable\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003e#\u003c/th\u003e\n            \u003cth\u003eTitle\u003c/th\u003e\n            \u003cth\u003eSolution\u003c/th\u003e\n        \u003c/tr\u003e\n    \u003c/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e1\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/draw-the-triangle-1/problem\"\u003eDraw The Triangle 1\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/alternative_queries/draw_triangle_1.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e2\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/draw-the-triangle-2/problem\"\u003eDraw The Triangle 2\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/alternative_queries/draw_triangle_2.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003e3\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://www.hackerrank.com/challenges/print-prime-numbers/problem\"\u003ePrint Prime Numbers\u003c/a\u003e\u003c/td\u003e\n            \u003ctd\u003e\u003ca href=\"https://github.com/djeada/Sql-HackerRank/blob/main/src/alternative_queries/print_prime_numbers.sql\"\u003esql\u003c/a\u003e\u003c/td\u003e\n        \u003c/tr\u003e\n    \u003c/tbody\u003e\n\u003c/table\u003e\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdjeada%2Fsql-hackerrank","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdjeada%2Fsql-hackerrank","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdjeada%2Fsql-hackerrank/lists"}