Re: Bypassing NULL elements in row_to_json function - Mailing list pgsql-general

On 08/04/2016 16:31, Michael Nolan wrote:
> I'm looking at the possibility of using JSON as a data exchange format
> with some apps running on both PCs and Macs.   .
>
> The table I would be exporting has a lot of NULL values in it.  Is
> there any way to skip the NULL values in the row_to_json function and
> include only the fields that are non-null?

You could use a CTE to filter out the nulls (not tested - I haven't used
JSON in PG (yet!)):

with no_nulls as (
  select ... from my_table
  where whatever is not null
)
select row_to_json(....) from no_nulls;

Ray.

--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie