MySQL Finding totals in multiple subqueries

Question

We have an app that helps people find other people to play basketball. We are associated with some basketball courses in the city. So I have been tasked to find 'how many times players who play at XXField (field_id = 460), play basketball the whole year'

I am not sure I understand what to do very well. These are the tables I am dealing with

Game_users Table

game_id | user_id | bill_id | created_at          | deleted_at
23455   | 3455    | 234     | 2019-02-06 03:16:40 | null
45678   | 6790    | 877     | 2020-02-09 07:26:34 | null
87666   | 2546    | 899     | 2020-04-20 06:06:06 | null
12312   | 1231    | 989     | 2019-02-22 09:22:31 | null

Games Table (that includes the basketball field's id)

id   | field_id | game_status| created_at          | deleted_at
23455| 460      | Completed  | 2019-02-06 03:16:40 | null
23455| 345      | Completed  | 2020-09-03 05:45:33 | null
87666| 460      | Completed  | 2020-12-12 08:34:22 | null
87666| 212      | Completed  | 2020-11-23 09:54:12 | null

I know I have to join both tables to get the field id and the players that played there. But how do I also get the total times they played golf this year as well? including the ones they played at 460.

I am sorry this is confusing, it's very confusing to me too.

My expected results would be something like

User_Id | Total Games | FieldXX Number of Games
1234    | 34          |  12

Answer 1

You can use the sub-query in IN clause and GROUP BY as follows:

SELECT GU.USER_ID,
       COUNT(1)
  FROM GAME_USERS AS GU
WHERE GU.GAME_ID IN (SELECT ID FROM GAMES AS G WHERE G.FIELD_ID = 460)
AND .. CONDITION ON created_at FOR WHOLE YEAR ACCORDING TO YOUR REQUIREMENT
GROUP BY GU.USER_ID