Join Rückkehr falsche Werte

Question

Tabellenstruktur der Datenbank:
Coach Tabelle

+----+-----------+-------+ 
| ID | Name | Age | 
+----+-----------+-------+ 
| 1 | Aaron  | 39 | 
| 2 | John  | 41 | 
| 3 | Macy  | 44 | 
| 4 | Mitchelle | 37 | 
| 5 | Candice | 32 | 
+----+-----------+-------+ 

Trainee Tisch

+----+---------+-------+ 
| ID | Name | Age | 
+----+---------+-------+ 
| 6 | Abigail | 9 | 
| 7 | Jim  | 12 | 
| 8 | Jack | 7 | 
| 9 | Maria | 14 | 
| 10 | Andy | 11 | 
+----+---------+-------+ 

Gebühren-Tabelle

+----+----------+------------+--------+ 
| ID | Coach_ID | Trainee_ID | Fee | 
+----+----------+------------+--------+ 
| 11 |  1 |   7 | 2400 | 
| 12 |  2 |   6 | 2000 | 
| 13 |  3 |   6 | 2000 | 
| 14 |  4 |   8 | 1243 | 
| 15 |  5 |   8 | 1275 | 
| 16 |  3 |   9 | 9010 | 
| 17 |  2 |   8 | 1900 | 
| 18 |  1 |   7 | 600 | 
| 19 |  2 |   10 | 1010 | 
| 20 |  5 |   10 | 2110 | 
+----+----------+------------+--------+ 

erforderliche Ausgabe

+-----------+--------------+--------+ 
| Name | Trainee_name | Fee | 
+-----------+--------------+--------+ 
| Aaron  | Jim   | 2400 | 
| Candice | Andy   | 2110 | 
| John  | Abigail  | 2000 | 
| Macy  | Maria  | 9010 | 
| Mitchelle | Jack   | 1243 | 
+-----------+--------------+--------+ 

=====

Mein QUERY

Select 
Coach.Name as Name, Trainee.Name as Trainee_name, Max(Fee.Fee) as Fee 
From Fee 
INNER JOIN Trainee 
    ON Fee.Trainee_ID = Trainee.ID 
INNER JOIN Coach 
    ON Fee.Coach_ID = Coach.ID 
GROUP BY Coach.Name 
ORDER BY Coach.Name; 

Meine Leistung:

+------------+---------------+--------+ 
| Name  | Trainee_name | Fee | 
+------------+---------------+--------+ 
| Aaron  | Jim   | 2400 | 
| Candice | Jack   | 2110 | 
| John  | Abigail  | 2000 | 
| Macy  | Abigail  | 9010 | 
| Mitchelle | Jack   | 1243 | 
+------------+---------------+--------+ 

Die Daten von Candice und Macy in trainee_name Spalte sind falsch entspricht.

Dump von SQL-Datenbank:

CREATE TABLE IF NOT EXISTS `coach` ( 
    `ID` int(11) NOT NULL, 
    `Name` text NOT NULL, 
    `Age` int(11) NOT NULL 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 


INSERT INTO `coach` (`ID`, `Name`, `Age`) VALUES 
(1, 'Aaron', 39), 
(2, 'John', 41), 
(3, 'Macy', 44), 
(4, 'Mitchelle', 37), 
(5, 'Candice', 32); 


CREATE TABLE IF NOT EXISTS `fee` ( 
    `ID` int(11) NOT NULL, 
    `Coach_ID` int(11) NOT NULL, 
    `Trainee_ID` int(11) NOT NULL, 
    `Fee` int(11) NOT NULL 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 


INSERT INTO `fee` (`ID`, `Coach_ID`, `Trainee_ID`, `Fee`) VALUES 
(11, 1, 7, 2400), 
(12, 2, 6, 2000), 
(13, 3, 6, 2000), 
(14, 4, 8, 1243), 
(15, 5, 8, 1275), 
(16, 3, 9, 9010), 
(17, 2, 8, 1900), 
(18, 1, 7, 600), 
(19, 2, 10, 1010), 
(20, 5, 10, 2110); 

CREATE TABLE IF NOT EXISTS `trainee` ( 
    `ID` int(11) NOT NULL, 
    `Name` text NOT NULL, 
    `Age` int(11) NOT NULL 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 


INSERT INTO `trainee` (`ID`, `Name`, `Age`) VALUES 
(6, 'Abigail', 9), 
(7, 'Jim', 12), 
(8, 'Jack', 7), 
(9, 'Maria', 14), 
(10, 'Andy', 11); 

Answer 1

Try this:

SELECT sub.name, trainee.name, sub.mx 
FROM 
(SELECT Fee.Coach_ID, Coach.Name, MAX(fee) AS mx 
FROM Coach 
INNER JOIN Fee ON Coach.ID = Fee.Coach_ID 
GROUP BY Fee.Coach_ID, Coach.Name) sub 
INNER JOIN fee ON sub.coach_ID = fee.coach_ID 
INNER JOIN trainee ON fee.trainee_ID = trainee.id 
WHERE sub.mx = fee.fee 
ORDER BY sub.name 

Sie können den Test sehe ich hier lief: http://sqlfiddle.com/#!9/cdbad/10.

Es hat Ihre gewünschte Ausgabe. Der Trick ist die Unterabfrage. Sie müssen zuerst die maximale Gebühr für jeden Coach ermitteln. Dann treten Sie den Auszubildenden über die Gebührentabelle bei.