Text concat problem

Hi:

Have this curious situation and would like some help from you:

Create an employee table:

CREATE  TABLE  employee(  id_employee SERIAL PRIMARY KEY,  sex CHAR(1) DEFAULT 'm' CHECK(sex = 'f' OR sex = 'm'),
start_dateDATE NOT NULL,  charge VARCHAR(50) NOT NULL,  last_name VARCHAR(50),  first_name VARCHAR(50) NOT NULL,  title
VARCHAR(10)NOT NULL
 
);

then fill it with a few values:

insert into employee(title,first_name,start_date,charge) values('Mr. X','Smith',date(now()),'None');
insert into employee(title,first_name,start_date,charge) values('Mr. Y','Smith',date(now()),'None');
insert into employee(title,first_name,start_date,charge) values('Mr. Z','Smith',date(now()),'None');

so far there is no problem at all, the problem comes here:

select title || ' ' || first_name || ' ' || last_name as fullname from employee;
  fullname   
----------------  (3 rows)

Doesn't work !!!!, I'm thinking it is because of the null value in last_name.  Have any idea or suggestion on how to
workaroundthis situation.
 

Thank you.

--
Luis Magaña
Gnovus Networks & Software
www.gnovus.com
Tel. +52 (7) 4422425
joe666@gnovus.com