CODEWITHSUNDEEP
mysqljoinintersectsubquery
pws5068
pws5068

Reputation: 2194

Nested SQL Query

I have the following tables:

Club: Club_ID | Title | Created_Date | ...

Club_Intesect: User_ID | Club_ID | Access

I'm trying to select a variable number of clubs, and join the ID of the user with the highest access in that club. This person is considered the owner.

So if Club 100 has Members A, B, C with access 3,4, and 5 respectively: I want the final query to select from club:

 Club.Club_ID     Club.Title        Club.Created_Date  Club_Intersect.User_ID

      100         |  "Test Club"   |  "Creation Date"     |       C             |
      101         | "Test Club 2"  |  "Creation_Date"     | Highest Access User |
      ...

Upvotes: 1

Views: 228

Answers (2)

colithium
colithium

Reputation: 10327

SELECT *
FROM Club c
JOIN Club_Intesect ci ON ci.Club_ID = c.Club_ID
WHERE ci.Access =
    (SELECT MAX(ACCESS)
     FROM Club_Intesect
     WHERE Club_ID = c.Club_ID)

Not tested but you get the idea

Upvotes: 1

chustar
chustar

Reputation: 12465

SELECT *
FROM Club
WHERE CLUB_ID =
    (SELECT Club_ID
     FROM Club_Intersect
     ORDER BY ACCESS DESC
     LIMIT 1);

I think that would work for selecting the club you want, using a nested SQL Query. You didn't specify what you wanted in your returned results, because this query would only retrieve the Club columns.

Upvotes: 1

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