Wie verschiedene Anzahl von Abfragen in einer Tabelle Ergebnis setzt

Question

Wenn ich diese drei Zählerabfragen für die Ex:

Erstens:

Select count(*) as red 
from A 

result = 10 

Zweitens:

Select count(*) as yellow 
from B 

result = 15 

Drittens:

Select count (*) as green 
from C 

result = 20 

Wie kann ich das Ergebnis usi machen ng Orakel wie

red  yellow  green 
10   15   20 

Answer 1

select (Select count(*) from a) red, (Select count(*) from b) yellow, (Select count(*) from b) green from dual; 

Answer 2

so etwas zu sein:

select * from (Select count(*) as red from A) as count_A 
,(Select count(*) as yellow from B) as count_B 
,(Select count (*) as green from C) as count_C