date_format and DECODE Problem

[Raimond X]

Hi, i have a problem with getting the right return values from field purrdato.
 All records exept a few are set with date and the rest is NULL. The field allows Null 
values. when using: DATE_FORMAT(purrdato, '%d.%m.%Y') AS purrdato .......it even 
returns '00.00.0000' on null values.
Is there a way of solving this with DECODE??? I vould like it to return '' instead of 
'00.00.000' for null values. This is the sql:
 
SQL = "SELECT OrgNr, Firmanavn, Kontakt, Sted, Telefon, Ansatte, eier, Slettet, aktiv, 
DATE_FORMAT(purrdato, '%d.%m.%Y') AS purrdato, TIME_FORMAT(purrtid, '%H:%i') AS 
purrtid FROM Kunder WHERE eier LIKE '" & Node.Key & "' ORDER BY Slettet, purrdato, 
purrtid, aktiv, Postnr, FirmaNavn"

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