I have a table with
	name_first
	name_middle
	name_last
if i try concatenating as such:
	SELECT
		name_first || ' ' || name_middle || ' ' || name_last
	FROM
		mytable
	;
I end up with NULL as the concatenated string whenever any of the  
referred fields contain a NULL value
I tried some text conversion and explicit casting , but that didn't work
What am I doing wrong ?