Adrian Klaver <adrian.klaver@aklaver.com> wrote:
>>
>> NULL concat with a value returns NULL. You can avoid that using
>> COALESCE(value, ''), that returns the value, or, if the value NULL, ''.
>
>
> http://www.postgresql.org/docs/9.5/interactive/functions-string.html
> "
> concat(str "any" [, str "any" [, ...] ]) text Concatenate the text
> representations of all the arguments. NULL arguments are ignored.
> "
you are right, my fault :-(, muddled with the || - operator.
Andreas
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