Solvesql Solution

- SQL

Author: SubAkBa

README.md

@@ -14,7 +14,12 @@
 
 - [List](https://github.com/SubAkBa/Algorithm_Solution/tree/master/Programmers)
 <hr>
-  
+
+<a href="https://solvesql.com/" target="_blank"><img src="./img/solvesql.png" width="220" height="70"></a>
+
+- [List](https://github.com/SubAkBa/Algorithm_Solution/tree/master/Solvesql)
+<hr>
+
 <a href="https://swexpertacademy.com/main/main.do" target="_blank"><img src="./img/swea.png" width="300" height="70"></a>
 
 - [List](https://github.com/SubAkBa/Algorithm_Solution/tree/master/SWEA)

Solvesql/README.md

@@ -0,0 +1,17 @@
+# Solvesql
+
+## 난이도 2
+
+<details open> <summary> 접기 / 펼치기 </summary>
+
+| Idx | Question                                              | Category                                                                   | Solution                                                                                                    | Note |
+|:---:|-------------------------------------------------------| -------------------------------------------------------------------------- |-------------------------------------------------------------------------------------------------------------| ---- |
+|  1  | [두 테이블 결합하기](https://solvesql.com/problems/join/)     | JOIN/UNION                                                     | [Solution]() | |
+|  2  | [레스토랑 웨이터의 팁 분석](https://solvesql.com/problems/tip-analysis/) | Aggregate                                                     | [Solution]() | |
+|  3  | [일별 블로그 방문자 수 집계](https://solvesql.com/problems/blog-counter/) | Aggregate                                                     | [Solution]() | |
+
+
+</details>
+
+<br />
+<br />

Solvesql/Solutions/두테이블결합하기.sql

@@ -0,0 +1,8 @@
+SELECT DISTINCT athlete_id
+FROM records
+WHERE EXISTS (
+    SELECT 1
+    FROM events
+    WHERE sport = 'Golf'
+    AND events.id = records.event_id
+);

Solvesql/Solutions/레스토랑웨이터의팁분석.sql

@@ -0,0 +1,7 @@
+SELECT day
+     , time
+     , ROUND(AVG(tip), 2) as avg_tip
+     , ROUND(AVG(size), 2) as avg_size
+FROM tips
+GROUP BY day, time
+ORDER BY day, time;

Solvesql/Solutions/일별블로그방문자수집계.sql

@@ -0,0 +1,7 @@
+SELECT event_date_kst AS dt
+     , COUNT(DISTINCT user_pseudo_id) AS users
+FROM ga
+WHERE event_date_kst >= '2021-08-02'
+AND event_date_kst <= '2021-08-09'
+GROUP BY event_date_kst
+ORDER BY dt;