Seb wrote:
> A query such as:
> 
> SELECT 'a' || 'b' || NULL;
> 
> returns a NULL.  How can I ensure I get 'ab' in the result?  I'm trying
> to concatenate columns and one of them might have NULL values, which I
> simply want to ignore.

COALESCE is your friend:
   select 'a' || 'b' || COALESCE(columnName, '');

HTH

Bosco.

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