Auswahl eindeutiger Werte aus 2 Spalten

Question

Ich bin auf der Suche nach einer SQL-Abfrage, die x Zeilen auswählt, wo die Spalten nur eindeutige Werte haben.

Tabelle genannt wird keezdrives_played die Säulen genannt: team_id und opponents_id

[1]

Dies ist, wie es aussehen sollte [Datenbank Bild.]: [Beispiel] [2]

Wo team_id und opponents_id eindeutige Werte haben

Answer 1

Sie können es mit einer Abfrage wie folgt tun:

SELECT t.team_id ,o.opponents_id FROM yourTAble t 
INNER JOIN (
    SELECT team_id,opponents_id FROM yourTAble 
    GROUP BY opponents_id 
    HAVING count(*) = 1 
) AS o ON o.team_id = t.team_id 
GROUP BY t.team_id 
HAVING count(*) = 1; 

Probe

mysql> select * from yourTable; 
+---------+--------------+ 
| team_id | opponents_id | 
+---------+--------------+ 
|  1 |   5 | 
|  1 |   6 | 
|  2 |   7 | 
|  2 |   80 | 
|  3 |   9 | 
|  4 |   11 | 
|  4 |   22 | 
|  8 |   5 | 
+---------+--------------+ 
8 rows in set (0,00 sec) 

mysql>  SELECT t.team_id ,o.opponents_id FROM yourTAble t 
    ->  INNER JOIN (
    ->   SELECT team_id,opponents_id FROM yourTAble 
    ->   GROUP BY opponents_id 
    ->   HAVING count(*) = 1 
    -> ) AS o ON o.team_id = t.team_id 
    ->  GROUP BY t.team_id 
    ->  HAVING count(*) = 1; 
+---------+--------------+ 
| team_id | opponents_id | 
+---------+--------------+ 
|  3 |   9 | 
+---------+--------------+ 
1 row in set (0,00 sec) 

mysql> 

siehe Kommentar

mysql> SELECT count(*) AS cnt , team_id 
    -> FROM keezdrives_played 
    -> GROUP BY team_id 
    -> ; 
+-----+---------+ 
| cnt | team_id | 
+-----+---------+ 
| 4 | 2281 | 
| 4 | 2282 | 
| 4 | 2283 | 
| 4 | 2284 | 
| 4 | 2285 | 
| 4 | 2286 | 
+-----+---------+ 
6 rows in set (0,00 sec) 

mysql> 

man versuchen, mehr

SELECT team_id,opponents_id 
FROM keezdrives_played 
GROUP BY CONCAT(team_id, '-', opponents_id) 
HAVING count(*) = 1; 

versuchen letzten

SELECT * FROM (
    SELECT t.team_id ,t.opponents_id 
    FROM keezdrives_played t 
    GROUP BY t.team_id 
    ) r 
GROUP BY r.opponents_id; 

Answer 2

Ich hoffe, das ist, was Sie

SELECT DISTINCT team_id ,opponents_id FROM keezdrives_played where drive_id=144;