On 2-1-2018 19:52, 'Walter R. Ojeda Valiente' 
[email protected] [firebird-support] wrote:
> 
> 
> What about:
> 
> SELECT
>     A,
>     B,
>     COALESCE(C, 'some value here')
> FROM
>     MyTable

That still requires column C to exist. Coalesce is for replacing null 
values with an alternative value.

Mark
-- 
Mark Rotteveel

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