Identifying Reason for Column Name Returned by SELECT

[Rich Shepard <rshepard@xxxxxxxxxxxxxxx>]

  I run this SELECT statement on a table:

select distinct(site_id) from chemistry order by site_id;

and in the returned set I see:

 GW-21
 GW-22
 GW-22         +

 GW-24

  I want to find that row returning 'GW-22      +' because I believe it
should be 'GW-23'. However, my attempts to retrieve that row keep failing.
I've tried these statements:

select count(*) from chemistry where site_id = 'GW-22         +';
 count 
-------
     0
(1 row)

yet,

select count(*) from chemistry where site_id = 'GW-22';
 count 
-------
   803
(1 row)

  Looking for the blank row also fails when I try to specify site_id as is
null, = ' ', or =''.

  Please point me to the proper way of finding this rogue row so I can
correct the value in the site_id column.

TIA,

Rich

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