🔀 22.01.12 - 오늘의 SQL #82

22.01.12 - 오늘의 SQL
mildsalmon · Jan 12, 2022 · 084505c · 084505c
2 parents f6bfc50 + d6df5aa
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diff --git a/2. SQL/2. HackerRank/1. Easy/Top Earners.sql b/2. SQL/2. HackerRank/1. Easy/Top Earners.sql
@@ -0,0 +1,17 @@
+/*
+Date    : 2022.01.12
+Update  : 2022.01.12
+Source  : Top Earners.sql
+Purpose : count / 서브쿼리
+url     : https://www.hackerrank.com/challenges/earnings-of-employees/problem?isFullScreen=true
+Author  : 김학진 (mildsalmon)
+Email   : mildsalmon@gamil.com
+*/
+
+-- count를 사용할때 다른 절이 있으면 다른 절들을 group by로 묶어줘야한다.
+SELECT a.months*a.salary, COUNT(a.months*a.salary)
+FROM employee a
+WHERE a.months*a.salary = (SELECT MAX(b.months*b.salary)
+                      FROM employee b)
+GROUP BY a.months*a.salary
+;
diff --git a/2. SQL/2. HackerRank/1. Easy/Weather Observation Station 13.sql b/2. SQL/2. HackerRank/1. Easy/Weather Observation Station 13.sql
@@ -0,0 +1,14 @@
+/*
+Date    : 2022.01.12
+Update  : 2022.01.12
+Source  : Weather Observation Station 13.sql
+Purpose : TRUNC / BETWEEN
+url     : https://www.hackerrank.com/challenges/weather-observation-station-13/problem?isFullScreen=true
+Author  : 김학진 (mildsalmon)
+Email   : mildsalmon@gamil.com
+*/
+
+SELECT TRUNC(SUM(LAT_N), 4)
+FROM STATION
+WHERE LAT_N BETWEEN 38.7880 AND 137.2345
+;
diff --git a/2. SQL/2. HackerRank/1. Easy/Weather Observation Station 2.sql b/2. SQL/2. HackerRank/1. Easy/Weather Observation Station 2.sql
@@ -0,0 +1,13 @@
+/*
+Date    : 2022.01.12
+Update  : 2022.01.12
+Source  : Weather Observation Station 2.sql
+Purpose : ROUND / SUM
+url     : https://www.hackerrank.com/challenges/weather-observation-station-2/problem?isFullScreen=true
+Author  : 김학진 (mildsalmon)
+Email   : mildsalmon@gamil.com
+*/
+
+SELECT ROUND(SUM(LAT_N), 2), ROUND(SUM(LONG_W), 2)
+FROM station
+;