Hi,

It is here.

http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions120.htm#i91806

>If expr2 is character data, then Oracle Database converts expr3 to the data 
>type of expr2 before returning a value unless expr3 is a null constant. In 
>that case, a data type conversion is not necessary, and the database returns 
>VARCHAR2 in the character set of expr2.

(but NVL2 returns CLOB not VARCHAR2, if expr2 is CLOB.)


litailang

2011/5/18 Thomas Mueller <[email protected]>:
> Hi,
>
> It sounds a bit like a hack. I would rather not add this feature,
> unless this is the officially documented behavior of Oracle.
>
> Could you provide a link to the Oracle documentation where this is described?
>
> Regards,
> Thomas
>
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