Formatted question description: https://leetcode.ca/all/1308.html

1308. Running Total for Different Genders

Level

Medium

Description

Table: Scores

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| player_name   | varchar |
| gender        | varchar |
| day           | date    |
| score_points  | int     |
+---------------+---------+
(gender, day) is the primary key for this table.
A competition is held between females team and males team.
Each row of this table indicates that a player_name and with gender has scored score_point in someday.
Gender is 'F' if the player is in females team and 'M' if the player is in males team.

Write an SQL query to find the total score for each gender at each day.

Order the result table by gender and day

The query result format is in the following example:

Scores table:
+-------------+--------+------------+--------------+
| player_name | gender | day        | score_points |
+-------------+--------+------------+--------------+
| Aron        | F      | 2020-01-01 | 17           |
| Alice       | F      | 2020-01-07 | 23           |
| Bajrang     | M      | 2020-01-07 | 7            |
| Khali       | M      | 2019-12-25 | 11           |
| Slaman      | M      | 2019-12-30 | 13           |
| Joe         | M      | 2019-12-31 | 3            |
| Jose        | M      | 2019-12-18 | 2            |
| Priya       | F      | 2019-12-31 | 23           |
| Priyanka    | F      | 2019-12-30 | 17           |
+-------------+--------+------------+--------------+
Result table:
+--------+------------+-------+
| gender | day        | total |
+--------+------------+-------+
| F      | 2019-12-30 | 17    |
| F      | 2019-12-31 | 40    |
| F      | 2020-01-01 | 57    |
| F      | 2020-01-07 | 80    |
| M      | 2019-12-18 | 2     |
| M      | 2019-12-25 | 13    |
| M      | 2019-12-30 | 26    |
| M      | 2019-12-31 | 29    |
| M      | 2020-01-07 | 36    |
+--------+------------+-------+
For females team:
First day is 2019-12-30, Priyanka scored 17 points and the total score for the team is 17.
Second day is 2019-12-31, Priya scored 23 points and the total score for the team is 40.
Third day is 2020-01-01, Aron scored 17 points and the total score for the team is 57.
Fourth day is 2020-01-07, Alice scored 23 points and the total score for the team is 80.
For males team:
First day is 2019-12-18, Jose scored 2 points and the total score for the team is 2.
Second day is 2019-12-25, Khali scored 11 points and the total score for the team is 13.
Third day is 2019-12-30, Slaman scored 13 points and the total score for the team is 26.
Fourth day is 2019-12-31, Joe scored 3 points and the total score for the team is 29.
Fifth day is 2020-01-07, Bajrang scored 7 points and the total score for the team is 36.

Solution

To obtain the total score, calculate the sum of score_points for all entries where day is less than or equal to the current day. Use select sum(socre_points) and use gender and day as filters to achieve this. Then select gender, day and the total score from table Scores, group the entries by gender and day, and order the entries by gender and day.

# Write your MySQL query statement below
select s.gender, s.day, (select sum(score_points) from Scores where gender = s.gender and day <= s.day) as total
    from Scores s
    group by gender, day
    order by gender, day;

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