Moin,There are a few ways to do this, one is by using the COALESCE function which returns the first of its arguments that is not null.
I try to concat values from three fields in a function like this:
create or replace function fconcat_name(varchar, varchar, varchar) returns varchar as '
declare
ttl alias for $1;
vnm alias for $2;
nme alias for $3;
begin
return ttl || '' '' || vnm || '' '' || nme;
end;
' language plpgsql;
That works but if one of the fields is empty there are to much spaces in the result. Is there any alternative to a monster if-then construct?
Many thanks Matthias
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eg
select coalesce('123' || ' ' || 456, null);
coalesce
----------
123 456
(1 row)
You could have a few COALESCE calls, or use a CASE expression, or use IF statements.
Ron
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