The following bug has been logged online:

Bug reference:      6036
Logged by:          jose soares
Email address:      jose.soa...@sferacarta.com
PostgreSQL version: 8.4.4
Operating system:   x86_64-pc-linux-gnu
Description:        why a REAL should be queried as a string?
Details: 

I'd like to to report this strange behavior, that I think is a bug...

# \d frazione
          Table "public.frazione"
   Column   |  Type   |     Modifiers
------------+---------+--------------------
 id         | integer | not null
 importo    | real    | not null

# update  frazione set importo=0.833 where id=549;
UPDATE 1
# select * from frazione where importo=0.833;
 id | importo
----+---------
(0 rows)

# select * from frazione where importo='0.833';
 id  | importo 
-----+----------
 549 |   0.833 
(1 rows)

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