Select literal values in the same column

Hello
like the practice:

Select 'A', 'B', 'C' for double
will select these values in their own column on the same line, is there a simple way to select these values in the same column on lines without first their insertion into a table?

Thank you 
SQL> select 'A' x from dual union
  2  select 'B' x from dual union
  3  select 'C' x from dual ;

X
-
A
B
C

A bit complicated:

SQL> select chr(ascii('A')+level-1) x
  2  from dual
  3  connect by level <=3;

X
-
A
B
C

Other:

SQL> select regexp_substr('ABC','[[:alpha:]]',1,level) x
  2  from dual
  3  connect by level <= length('ABC');

X
---
A
B
C

Max
http://oracleitalia.WordPress.com

Published by: Massimo Ruocchio, February 12, 2010 17:55
added a second

Published by: Massimo Ruocchio, February 12, 2010 17:58
Added the third

Tags: Database

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