Ich brauche 2 verschiedene AVG colums zu machen, aber kann nicht scheinen, dieses zu erhalten

Question

SELECT AVG(goals1) FROM matches 
WHERE cid='1' 
(SELECT AVG(goals2) FROM matches 
WHERE cid='2') 
; 

Answer 1

UNION wie dies zwischen den Aussagen hinzufügen zu arbeiten:

SELECT AVG(goals1) FROM matches 
WHERE cid='1' 
UNION 
SELECT AVG(goals2) FROM matches 
WHERE cid='2' 

Sie müssen möglicherweise auch die Spalten nennen.

Answer 2

SELECT AVG(goals1) AvgCid1, (SELECT AVG(goals2) FROM matches WHERE cid='2') AvgCid2 
FROM matches 
WHERE cid='1' 

Answer 3

Wie wäre es damit?

SELECT * FROM 
(SELECT AVG(goals1) AS goals1 FROM matches WHERE cid='1') t1 
full outer join 
(SELECT AVG(goals2) AS goals2 FROM matches WHERE cid='2') t2 
ON t1.goals1 <> t2.goals2;