Missing value from PostgreSQL query?

[Zuoxin.Wang@xxxxxx]

Hi all,
Does any one know why I have following inconsistant results from PostgreSQL under Cygwin?

When I switch the select order, or use "select * from patient", some values are missing from returned results.

What might be wrong?

Thanks in advance.
 

test=# select  first_name, last_name, used, birthday from patient;
 first_name | last_name | used |  birthday
------------+-----------+------+------------
   | 1960-02-01DI       | N
   | 1960-02-01DI       | N
(2 rows)

test=# select  first_name, last_name, birthday, used from patient;
 first_name | last_name |  birthday  | used
------------+-----------+------------+------
 AAAAAA     | TDI       | 1960-02-01 | N
 AAAAAB     | TDI       | 1960-02-01 | N
(2 rows)
/* worked fine */

est=# select birthday from patient;
  birthday
------------
 1960-02-01
 1960-02-01
(2 rows)

test=# select used from patient;
 used
------
 N
 N
(2 rows)

test=# select used, birthday from patient;
 used |  birthday
------+------------
   | 1960-02-01
   | 1960-02-01
(2 rows)


Jason