Solvesql Solution

- SQL

Author: SubAkBa

Solvesql/README.md

@@ -32,5 +32,17 @@
 
 </details>
 
+<br />
+<br />
+
+## 난이도 3
+
+<details open> <summary> 접기 / 펼치기 </summary>
+
+| Idx | Question                                              | Category                                                                   | Solution                                                                                                    | Note |
+|:---:|-------------------------------------------------------| -------------------------------------------------------------------------- |-------------------------------------------------------------------------------------------------------------| ---- |
+
+</details>
+
 <br />
 <br />

Solvesql/Solutions/installment-month.sql

@@ -0,0 +1,15 @@
+-- @ss.idx: 2
+-- @ss.level: 3
+-- @ss.title: 할부는 몇 개월로 해드릴까요
+-- @ss.slug: installment-month
+-- @ss.category: Aggregate
+-- @ss.note:
+
+SELECT payment_installments
+     , COUNT(DISTINCT order_id) AS order_count
+     , MIN(payment_value) AS min_value
+     , MAX(payment_value) AS max_value
+     , AVG(payment_value) AS avg_value
+FROM olist_order_payments_dataset
+WHERE payment_type = 'credit_card'
+GROUP BY payment_installments;

Solvesql/Solutions/multiple-medalist.sql

@@ -0,0 +1,16 @@
+-- @ss.idx: 1
+-- @ss.level: 3
+-- @ss.title: 복수 국적 메달 수상한 선수 찾기
+-- @ss.slug: multiple-medalist
+-- @ss.category: JOIN/UNION
+-- @ss.note:
+
+SELECT a.name
+FROM athletes a
+JOIN records r ON r.athlete_id = a.id
+JOIN games g   ON g.id = r.game_id
+WHERE r.medal != ""
+AND g.year >= 2000
+GROUP BY a.id
+HAVING COUNT(DISTINCT r.team_id) >= 2
+ORDER BY a.name;