Add solution for Aggregation domain

jivan99 · Jul 26, 2021 · af1d39b · af1d39b
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Showing 18 changed files with 149 additions and 17 deletions.
diff --git a/03 Aggregation/10_weather_observation_station_13.sql b/03 Aggregation/10_weather_observation_station_13.sql
@@ -0,0 +1,7 @@
+SELECT
+    TRUNCATE(SUM(lat_n), 4)
+FROM
+    station
+WHERE
+    lat_n < 137.2345
+    AND lat_n > 38.7880;
diff --git a/03 Aggregation/11_weather_observation_station_14.sql b/03 Aggregation/11_weather_observation_station_14.sql
@@ -0,0 +1,6 @@
+SELECT
+    TRUNCATE(MAX(lat_n), 4)
+FROM
+    station
+WHERE
+    lat_n < 137.2345;
diff --git a/03 Aggregation/12_weather_observation_station_15.sql b/03 Aggregation/12_weather_observation_station_15.sql
@@ -0,0 +1,10 @@
+SELECT
+    ROUND(long_w, 4)
+FROM
+    station
+WHERE
+    lat_n < 137.2345
+ORDER BY
+    lat_n DESC
+LIMIT
+    1;
diff --git a/03 Aggregation/13_weather_observation_station_16.sql b/03 Aggregation/13_weather_observation_station_16.sql
@@ -0,0 +1,10 @@
+SELECT
+    ROUND(lat_n, 4)
+FROM
+    station
+WHERE
+    lat_n > 38.7880
+ORDER BY
+    lat_n
+LIMIT
+    1;
diff --git a/03 Aggregation/14_weather_observation_station_17.sql b/03 Aggregation/14_weather_observation_station_17.sql
@@ -0,0 +1,10 @@
+SELECT
+    ROUND(long_w, 4)
+FROM
+    station
+WHERE
+    lat_n > 38.7880
+ORDER BY
+    lat_n
+LIMIT
+    1;
diff --git a/03 Aggregation/15_weather_observation_station_18.sql b/03 Aggregation/15_weather_observation_station_18.sql
@@ -0,0 +1,7 @@
+SELECT
+    ROUND(
+        (MAX(lat_n) - MIN(lat_n)) + (MAX(long_w) - MIN(long_w)),
+        4
+    )
+FROM
+    station;
diff --git a/03 Aggregation/16_weather_observation_station_19.sql b/03 Aggregation/16_weather_observation_station_19.sql
@@ -0,0 +1,9 @@
+SELECT
+    FORMAT(
+        SQRT(
+            POWER((MAX(lat_n) - MIN(lat_n)), 2) + POWER((MAX(long_w) - MIN(long_w)), 2)
+        ),
+        4
+    )
+FROM
+    station;
diff --git a/03 Aggregation/17_weather_observation_station_20.sql b/03 Aggregation/17_weather_observation_station_20.sql
@@ -0,0 +1,19 @@
+SET
+    @rowindex: = 0;
+SELECT
+    ROUND(AVG(s.lat_n), 4)
+FROM
+    (
+        SELECT
+            @rowindex: = @rowindex + 1 AS rowindex,
+            lat_n AS lat_n
+        FROM
+            station
+        ORDER BY
+            lat_n
+    ) AS s
+WHERE
+    s.rowindex in (
+        FLOOR((@rowindex + 1) / 2),
+        CEIL((@rowindex + 1) / 2)
+    );
diff --git a/03 Aggregation/1_revising_aggregations-the_count_function.sql b/03 Aggregation/1_revising_aggregations-the_count_function.sql
@@ -0,0 +1,6 @@
+SELECT
+    COUNT(*)
+FROM
+    city
+WHERE
+    population > 100000;
diff --git a/03 Aggregation/2_revising_aggregations-the_sum_function.sql b/03 Aggregation/2_revising_aggregations-the_sum_function.sql
@@ -0,0 +1,6 @@
+SELECT
+    SUM(population)
+FROM
+    city
+WHERE
+    DISTRICT = 'California';
diff --git a/03 Aggregation/3_revising_aggregations-averages.sql b/03 Aggregation/3_revising_aggregations-averages.sql
@@ -0,0 +1,6 @@
+SELECT
+    AVG(population)
+FROM
+    city
+WHERE
+    district = 'California';
diff --git a/03 Aggregation/4_average_population.sql b/03 Aggregation/4_average_population.sql
@@ -0,0 +1,4 @@
+SELECT
+    FLOOR(AVG(population))
+FROM
+    city;
diff --git a/03 Aggregation/5_japan_population.sql b/03 Aggregation/5_japan_population.sql
@@ -0,0 +1,6 @@
+SELECT
+    SUM(population)
+FROM
+    city
+WHERE
+    countrycode = 'JPN';
diff --git a/03 Aggregation/6_population_density_difference.sql b/03 Aggregation/6_population_density_difference.sql
@@ -0,0 +1,4 @@
+SELECT
+    MAX(population) - MIN(population)
+FROM
+    city;
diff --git a/03 Aggregation/7_the_blunder.sql b/03 Aggregation/7_the_blunder.sql
@@ -0,0 +1,6 @@
+SELECT
+    CEIL(
+        AVG(salary) - AVG(CAST(REPLACE(salary, '0', '') AS SIGNED))
+    )
+FROM
+    employees;
diff --git a/03 Aggregation/8_top_earners.sql b/03 Aggregation/8_top_earners.sql
@@ -0,0 +1,11 @@
+SELECT
+    (salary * months) AS earning,
+    COUNT(*)
+FROM
+    employee
+GROUP BY
+    earning
+ORDER BY
+    1 DESC
+LIMIT
+    1;
diff --git a/03 Aggregation/9_weather_observation_station_2.sql b/03 Aggregation/9_weather_observation_station_2.sql
@@ -0,0 +1,5 @@
+SELECT
+    ROUND(SUM(lat_n), 2),
+    ROUND(SUM(long_w), 2)
+FROM
+    STATION;
diff --git a/README.md b/README.md
@@ -49,23 +49,23 @@ The solutions to all the HackerRank SQL Track Challenges on MySQL Environment.
 
 |S.N.|Challenge |Solution|
 |----|----------|--------|
-|1.|[Revising Aggregations - The Count Function](https://www.hackerrank.com/challenges/revising-aggregations-the-count-function)|[]()|
-|2.|[Revising Aggregations - The Sum Function](https://www.hackerrank.com/challenges/revising-aggregations-sum)|[]()|
-|3.|[Revising Aggregations - Averages](https://www.hackerrank.com/challenges/revising-aggregations-the-average-function)|[]()|
-|4.|[Average Population](https://www.hackerrank.com/challenges/average-population)|[]()|
-|5.|[Japan Population](https://www.hackerrank.com/challenges/japan-population)|[]()|
-|6.|[Population Density Difference](https://www.hackerrank.com/challenges/population-density-difference)|[]()|
-|7.|[The Blunder](https://www.hackerrank.com/challenges/the-blunder)|[]()|
-|8.|[Top Earners](https://www.hackerrank.com/challenges/earnings-of-employees)|[]()|
-|9.|[Weather Observation Station 2](https://www.hackerrank.com/challenges/weather-observation-station-2)|[]()|
-|10.|[Weather Observation Station 13](https://www.hackerrank.com/challenges/weather-observation-station-13)|[]()|
-|11.|[Weather Observation Station 14](https://www.hackerrank.com/challenges/weather-observation-station-14)|[]()|
-|12.|[Weather Observation Station 15](https://www.hackerrank.com/challenges/weather-observation-station-15)|[]()|
-|13.|[Weather Observation Station 16](https://www.hackerrank.com/challenges/weather-observation-station-16)|[]()|
-|14.|[Weather Observation Station 17](https://www.hackerrank.com/challenges/weather-observation-station-17)|[]()|
-|15.|[Weather Observation Station 18](https://www.hackerrank.com/challenges/weather-observation-station-18)|[]()|
-|16.|[Weather Observation Station 19](https://www.hackerrank.com/challenges/weather-observation-station-19)|[]()|
-|17.|[Weather Observation Station 20](https://www.hackerrank.com/challenges/weather-observation-station-20)|[]()|
+|1.|[Revising Aggregations - The Count Function](https://www.hackerrank.com/challenges/revising-aggregations-the-count-function)|[Solution](/03%20Aggregation/1_revising_aggregations-the_count_function.sql)|
+|2.|[Revising Aggregations - The Sum Function](https://www.hackerrank.com/challenges/revising-aggregations-sum)|[Solution](/03%20Aggregation/2_revising_aggregations-the_sum_function.sql)|
+|3.|[Revising Aggregations - Averages](https://www.hackerrank.com/challenges/revising-aggregations-the-average-function)|[Solution](/03%20Aggregation/3_revising_aggregations-averages.sql)|
+|4.|[Average Population](https://www.hackerrank.com/challenges/average-population)|[Solution](/03%20Aggregation/4_average_population.sql)|
+|5.|[Japan Population](https://www.hackerrank.com/challenges/japan-population)|[Solution](/03%20Aggregation/5_japan_population.sql)|
+|6.|[Population Density Difference](https://www.hackerrank.com/challenges/population-density-difference)|[Solution](/03%20Aggregation/6_population_density_difference.sql)|
+|7.|[The Blunder](https://www.hackerrank.com/challenges/the-blunder)|[Solution](/03%20Aggregation/7_the_blunder.sql)|
+|8.|[Top Earners](https://www.hackerrank.com/challenges/earnings-of-employees)|[Solution](/03%20Aggregation/8_top_earners.sql)|
+|9.|[Weather Observation Station 2](https://www.hackerrank.com/challenges/weather-observation-station-2)|[Solution](/03%20Aggregation/9_weather_observation_station_2.sql)|
+|10.|[Weather Observation Station 13](https://www.hackerrank.com/challenges/weather-observation-station-13)|[Solution](/03%20Aggregation/10_weather_observation_station_13.sql)|
+|11.|[Weather Observation Station 14](https://www.hackerrank.com/challenges/weather-observation-station-14)|[Solution](/03%20Aggregation/11_weather_observation_station_14.sql)|
+|12.|[Weather Observation Station 15](https://www.hackerrank.com/challenges/weather-observation-station-15)|[Solution](/03%20Aggregation/12_weather_observation_station_15.sql)|
+|13.|[Weather Observation Station 16](https://www.hackerrank.com/challenges/weather-observation-station-16)|[Solution](/03%20Aggregation/13_weather_observation_station_16.sql)|
+|14.|[Weather Observation Station 17](https://www.hackerrank.com/challenges/weather-observation-station-17)|[Solution](/03%20Aggregation/14_weather_observation_station_17.sql)|
+|15.|[Weather Observation Station 18](https://www.hackerrank.com/challenges/weather-observation-station-18)|[Solution](/03%20Aggregation/15_weather_observation_station_18.sql)|
+|16.|[Weather Observation Station 19](https://www.hackerrank.com/challenges/weather-observation-station-19)|[Solution](/03%20Aggregation/16_weather_observation_station_19.sql)|
+|17.|[Weather Observation Station 20](https://www.hackerrank.com/challenges/weather-observation-station-20)|[Solution](/03%20Aggregation/17_weather_observation_station_20.sql)|
 
 ## Basic Join