This works as intended. Try this:
select coalesce(lower(firstname), '') || ' ' || coalesce(lower(lastname), '') from person
Concating something unknown (=NULL) and a string = unknown (=NULL)
-----Ursprüngliche Nachricht-----
Von: pgsql-hackers-owner@postgresql.org [mailto:pgsql-hackers-owner@postgresql.org] Im Auftrag von Andreas Joseph Krogh
Gesendet: Freitag, 15. September 2006 09:53
An: pgsql-hackers@postgresql.org
Betreff: [HACKERS] lower() not working correctly...?
I have the following query:
select lower(firstname) || ' ' || lower(lastname) from person
firstname and lastname are VARCHAR
lower() returns NULL when firstname OR lastname is NULL, is this correct?
