task 44

Author: BEPb

README.md

@@ -67,6 +67,7 @@
 41. Станция наблюдения за погодой 19 - [Weather Observation Station 19](./tasks/41.md)
 42. Станция наблюдения за погодой 20 - [Weather Observation Station 20](./tasks/42.md)
 43. Таблица лидеров конкурса - [Contest Leaderboard](./tasks/43.md)
+44. Интервью - [Interviews](./tasks/44.md)
 
 
 ## В процессе...  , будет дополнено)

tasks/44.md

@@ -3,21 +3,94 @@
 <img src="./art/44.png" alt="solution" >
 
 #### eng:
+Samantha interviews many candidates from different  colleges using coding challenges and contests. Write a query to 
+print the contest_id, hacker_id, name, and the sums  of total_submissions, total_accepted_submissions, total_views, 
+and total_unique_views for each contest sorted by contest_id. Exclude the contest from the result if all four sums are .
 
+Note: A specific contest can be used to screen candidates at more than one college, but each college only holds  
+screening contest. 
 
 
 #### рус:
+Саманта берет интервью у многих кандидатов из разных  колледжей, используя задачи и конкурсы по программированию. 
+Напишите запрос для вывода идентификатора конкурса,  идентификатора хакера, имени и сумм total_submissions, 
+total_accepted_submissions, total_views и total_unique_views  для каждого конкурса, отсортированного по конкурсу_id. 
+Исключить конкурс из результата, если все четыре суммы равны .
 
+Примечание. Определенный конкурс может использоваться для отбора кандидатов более чем в одном колледже, но каждый 
+колледж проводит только отборочный конкурс. 
 
 
 #### код с коментариями:
 ```sql
-
+WITH TOTAL_SUBMISSION_STATS AS (
+    SELECT CHALLENGE_ID, 
+    SUM(TOTAL_SUBMISSIONS) AS GRAND_TOTAL_SUBMISSIONS, 
+    SUM(TOTAL_ACCEPTED_SUBMISSIONS) AS GRAND_TOTAL_ACCEPTED_SUBMISSIONS
+    FROM SUBMISSION_STATS
+    GROUP BY CHALLENGE_ID
+), TOTAL_VIEW_STATS AS (
+    SELECT CHALLENGE_ID, 
+    SUM(TOTAL_VIEWS) AS GRAND_TOTAL_VIEWS, 
+    SUM(TOTAL_UNIQUE_VIEWS) AS GRAND_TOTAL_UNIQUE_VIEWS
+    FROM VIEW_STATS
+    GROUP BY CHALLENGE_ID
+)
+SELECT C1.CONTEST_ID, HACKER_ID, NAME,
+    SUM(GRAND_TOTAL_SUBMISSIONS),
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS), 
+    SUM(GRAND_TOTAL_VIEWS), 
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS) 
+FROM 
+    CONTESTS C1 
+    LEFT JOIN COLLEGES C2 ON C1.CONTEST_ID = C2.CONTEST_ID 
+    LEFT JOIN CHALLENGES C3 ON C2.COLLEGE_ID = C3.COLLEGE_ID
+    LEFT JOIN TOTAL_VIEW_STATS V ON C3.CHALLENGE_ID = V.CHALLENGE_ID
+    LEFT JOIN TOTAL_SUBMISSION_STATS S ON C3.CHALLENGE_ID = S.CHALLENGE_ID
+GROUP BY 
+    C1.CONTEST_ID, HACKER_ID, NAME
+HAVING 
+    SUM(GRAND_TOTAL_SUBMISSIONS) + 
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS) +
+    SUM(GRAND_TOTAL_VIEWS) +
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS) != 0
+ORDER BY C1.CONTEST_ID;
 ```
 
 #### код для hackerrank:
 ```sql
-
+WITH TOTAL_SUBMISSION_STATS AS (
+    SELECT CHALLENGE_ID, 
+    SUM(TOTAL_SUBMISSIONS) AS GRAND_TOTAL_SUBMISSIONS, 
+    SUM(TOTAL_ACCEPTED_SUBMISSIONS) AS GRAND_TOTAL_ACCEPTED_SUBMISSIONS
+    FROM SUBMISSION_STATS
+    GROUP BY CHALLENGE_ID
+), TOTAL_VIEW_STATS AS (
+    SELECT CHALLENGE_ID, 
+    SUM(TOTAL_VIEWS) AS GRAND_TOTAL_VIEWS, 
+    SUM(TOTAL_UNIQUE_VIEWS) AS GRAND_TOTAL_UNIQUE_VIEWS
+    FROM VIEW_STATS
+    GROUP BY CHALLENGE_ID
+)
+SELECT C1.CONTEST_ID, HACKER_ID, NAME,
+    SUM(GRAND_TOTAL_SUBMISSIONS),
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS), 
+    SUM(GRAND_TOTAL_VIEWS), 
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS) 
+FROM 
+    CONTESTS C1 
+    LEFT JOIN COLLEGES C2 ON C1.CONTEST_ID = C2.CONTEST_ID 
+    LEFT JOIN CHALLENGES C3 ON C2.COLLEGE_ID = C3.COLLEGE_ID
+    LEFT JOIN TOTAL_VIEW_STATS V ON C3.CHALLENGE_ID = V.CHALLENGE_ID
+    LEFT JOIN TOTAL_SUBMISSION_STATS S ON C3.CHALLENGE_ID = S.CHALLENGE_ID
+GROUP BY 
+    C1.CONTEST_ID, HACKER_ID, NAME
+HAVING 
+    SUM(GRAND_TOTAL_SUBMISSIONS) + 
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS) +
+    SUM(GRAND_TOTAL_VIEWS) +
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS) != 0
+ORDER BY C1.CONTEST_ID;
 ```
 
 

tasks/44.sql

@@ -0,0 +1,32 @@
+WITH TOTAL_SUBMISSION_STATS AS (
+    SELECT CHALLENGE_ID,
+    SUM(TOTAL_SUBMISSIONS) AS GRAND_TOTAL_SUBMISSIONS,
+    SUM(TOTAL_ACCEPTED_SUBMISSIONS) AS GRAND_TOTAL_ACCEPTED_SUBMISSIONS
+    FROM SUBMISSION_STATS
+    GROUP BY CHALLENGE_ID
+), TOTAL_VIEW_STATS AS (
+    SELECT CHALLENGE_ID,
+    SUM(TOTAL_VIEWS) AS GRAND_TOTAL_VIEWS,
+    SUM(TOTAL_UNIQUE_VIEWS) AS GRAND_TOTAL_UNIQUE_VIEWS
+    FROM VIEW_STATS
+    GROUP BY CHALLENGE_ID
+)
+SELECT C1.CONTEST_ID, HACKER_ID, NAME,
+    SUM(GRAND_TOTAL_SUBMISSIONS),
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS),
+    SUM(GRAND_TOTAL_VIEWS),
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS)
+FROM
+    CONTESTS C1
+    LEFT JOIN COLLEGES C2 ON C1.CONTEST_ID = C2.CONTEST_ID
+    LEFT JOIN CHALLENGES C3 ON C2.COLLEGE_ID = C3.COLLEGE_ID
+    LEFT JOIN TOTAL_VIEW_STATS V ON C3.CHALLENGE_ID = V.CHALLENGE_ID
+    LEFT JOIN TOTAL_SUBMISSION_STATS S ON C3.CHALLENGE_ID = S.CHALLENGE_ID
+GROUP BY
+    C1.CONTEST_ID, HACKER_ID, NAME
+HAVING
+    SUM(GRAND_TOTAL_SUBMISSIONS) +
+    SUM(GRAND_TOTAL_ACCEPTED_SUBMISSIONS) +
+    SUM(GRAND_TOTAL_VIEWS) +
+    SUM(GRAND_TOTAL_UNIQUE_VIEWS) != 0
+ORDER BY C1.CONTEST_ID;