Обсуждение: 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?

This is 8.2devel from 24.08.2006.

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Andreas Joseph Krogh <andreak@officenet.no>
Senior Software Developer / Manager
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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?