Selecting IDs from a MIN query that includes join - mysql

Question

sorry about the title, very bad at titles!
I have these relevant tables:
Times
+--------+----------+-------------+------+---------+
| TimeID | PlayerID | MapCourseID | Mode | RunTime |
+--------+----------+-------------+------+---------+
Checkpoints
+--------------+--------+------------+---------+
| CheckpointID | TimeID | Checkpoint | RunTime |
+--------------+--------+------------+---------+
Maps
+-------+------+
| MapID | Name |
+-------+------+
MapCourses
+-----------+-------+--------+
| MapCourse | MapID | Course |
+-----------+-------+--------+
RunTime stores their "time" as an int
I have a query that selects the fastest times for a specific map MapID on all courses and all modes
SELECT MIN(Times.RunTime), MapCourses.Course, Times.Mode
FROM Times
INNER JOIN MapCourses ON MapCourses.MapCourseID=Times.MapCourseID
INNER JOIN Players ON Players.PlayerID=Times.PlayerID
WHERE Players.Cheater=0 AND MapCourses.MapID=%d
GROUP BY MapCourses.Course, Times.Mode;
Which works fine, but now I want to make another query that selects the checkpoints of the fastest times, since checkpoints are associated with a TimeID
I've tried doing something like this
SELECT * FROM Checkpoints
INNER JOIN (
SELECT
MIN(Times.RunTime),
MapCourses.Course,
Times.Mode,
MapCourses.MapID,
Players.SteamID32
FROM
Times
INNER JOIN MapCourses ON MapCourses.MapCourseID = Times.MapCourseID
INNER JOIN Players ON Players.PlayerID = Times.PlayerID
WHERE
Players.Cheater = 0
AND MapCourses.MapID = %d
GROUP BY
MapCourses.Course,
Times.Mode
) AS wrs ON Checkpoints.TimeID = wrs.TimeID
Also tried something like this:
SELECT
Checkpoints.RunTime,
Checkpoints.Checkpoint,
MapCourses.Course,
Times.Mode,
Times.TimeID,
Players.Alias
FROM
Checkpoints
INNER JOIN Times ON Times.TimeID = Checkpoints.TimeID
INNER JOIN MapCourses ON MapCourses.MapCourseID = Times.MapCourseID
INNER JOIN Players ON Players.PlayerID = Times.PlayerID
WHERE
Players.Cheater = 0
AND MapCourses.MapID = %d
AND Times.RunTime = (
SELECT
MIN(Times.RunTime)
FROM
Times
WHERE
Times.MapCourseID = MapCourses.MapCourseID
AND Mode = Times.Mode
)
Neither seem to really work, any help would be great, thanks!
Basically, if i'm working on map id 50, I already have a query that gets the fastest time on map id 50 for all modes & courses, the query i'm trying to build is a query that gets the checkpoints of the fastest times for every course and mode on map id 50

Answer 1

We could do something like this:
SELECT c.checkpointid
, c.timeid
, c.checkpoint
, c.runtime
, ...
FROM ( SELECT t.mapcourseid
, t.mode
, MIN(r.runtime) AS min_runtime
FROM Times r
JOIN Players p
ON p.playerid = r.playerid
AND p.cheater = 0
JOIN MapCourses s
ON s.mapcourseid = t.mapcourse_id
AND s.mapid = ?
GROUP
BY t.mapcourseid
, t.mode
) q
JOIN Times t
ON t.runtime = q.min_runtime
AND t.mapcourseid = q.mapcourseid
JOIN Checkpoints c
ON c.timeid = t.timeid
The trick here is using a query as an inline view. The result returned from the query inside the parens gets returned as a resultset, which is then used like a table by the outer query. MySQL calls it a "derived table".
In the outer SELECT list, we can include references to columns from q and t as well as c.
Note: If there are two or more rows from t that match the minimumn runtime (returned by q), the query will return all of the matching rows.
The specification is a bit unclear. The query in this answer satisfies one particular interpretation.

Answer 2

If I'm following this correctly, you want the shortest Checkpoints.TimeID for each Checkpoint in a similar format to the above?
SELECT MIN(Checkpoints.TimeID), MapCourses.Course, Checkpoints.Checkpoint, Times.Mode
FROM Checkpoints
INNER JOIN Times ON Checkpoints.TimeID=Times.TimeID
INNER JOIN MapCourses ON MapCourses.MapCourseID=Times.MapCourseID
INNER JOIN Players ON Players.PlayerID=Times.PlayerID
WHERE Players.Cheater=0 AND MapCourses.MapID=%d
GROUP BY MapCourses.Course, Checkpoints.Checkpoint, Times.Mode;
Obviously not having access to your Database I can't test this, but, seems to be what you're asking?
[edit]
Ahh, so you want to keep the min times, but would like to add checkpoints into the returned values:
SELECT MIN(Times.RunTime), MapCourses.Course, Checkpoints.Checkpoint, Times.Mode
FROM Times
INNER JOIN MapCourses ON MapCourses.MapCourseID=Times.MapCourseID
INNER JOIN Players ON Players.PlayerID=Times.PlayerID
INNER JOIN Checkpoints ON Checkpoints.TimeID=Times.TimeID
WHERE Players.Cheater=0 AND MapCourses.MapID=%d
GROUP BY MapCourses.Course, Checkpoints.Checkpoint, Times.Mode;
So this should return your fastest time, the map, checkpoints and then mode.