Why wont this update work? - Mailing list pgsql-sql

Hi,
trying to get this to work with pgsql, but it refuses to do anything...
  the table is called catalog. The field is called language and is a
varchar(3) field.  81 of the records have the letter 'E' in the language field. i want to
put 'NoD' in the rest.
 UPDATE catalog    SET language = 'NoD'    WHERE NOT language = 'E';

nor does
 UPDATE catalog    SET language = 'NoD'    WHERE language = 'NULL';    ........ or NULL and so on.

I can change the 81 letter 'E's to anything I like, but can not UPDATE the
blank fields..

can anyone tell me what I am missing here please?

Thanks
Bob


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