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22.04.05 - 오늘의 SQL #189

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Merged
merged 3 commits into from
Apr 5, 2022
Merged

22.04.05 - 오늘의 SQL #189

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5a73795
:tada:[Add] Weather Observation Station 1 - 1차 시도 (성공)
mildsalmon Apr 5, 2022
b430bd2
:tada:[Add] Weather Observation Station 3 - 1차 시도 (성공)
mildsalmon Apr 5, 2022
080d950
:tada:[Add] Weather Observation Station 4 - 1차 시도 (성공)
mildsalmon Apr 5, 2022
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13 changes: 13 additions & 0 deletions 2_SQL/2_HackerRank/Mysql/1. Easy/Weather Observation Station 1.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
/*
Date : 2022.04.05
Update : 2022.04.05
Source : Weather Observation Station 1.sql
Purpose : SELECT
url : https://www.hackerrank.com/challenges/weather-observation-station-1/problem?isFullScreen=true
Author : 김학진 (mildsalmon)
Email : mildsalmon@gamil.com
*/

SELECT city, state
FROM station
;
14 changes: 14 additions & 0 deletions 2_SQL/2_HackerRank/Mysql/1. Easy/Weather Observation Station 3.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
/*
Date : 2022.04.05
Update : 2022.04.05
Source : Weather Observation Station 3.sql
Purpose : SELECT / MOD
url : https://www.hackerrank.com/challenges/weather-observation-station-3/problem?isFullScreen=true
Author : 김학진 (mildsalmon)
Email : mildsalmon@gamil.com
*/

SELECT DISTINCT(city)
FROM station
WHERE MOD(ID, 2) = 0
;
13 changes: 13 additions & 0 deletions 2_SQL/2_HackerRank/Mysql/1. Easy/Weather Observation Station 4.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
/*
Date : 2022.04.05
Update : 2022.04.05
Source : Weather Observation Station 4.sql
Purpose : SELECT / COUNT / DISTINCT
url : https://www.hackerrank.com/challenges/weather-observation-station-4/problem?isFullScreen=true
Author : 김학진 (mildsalmon)
Email : mildsalmon@gamil.com
*/

SELECT COUNT(city) - COUNT(DISTINCT(city))
FROM station
;