Null for "SELECT SERVERPROPERTY('productversion')"

hai wu <[email protected]>
Newsgroups gmane.comp.db.tds.freetds
Message-ID <CAJ1=nZf+Njet5j-PbtWBwaC4rsD=7Py4n0=cobhnRDyTW_W6MA@mail.gmail.com>
Freetds 0.64 is used here. When I used it to connect to a MS SQL 2008
named instance, I could retrieve value using:

SELECT @@SERVERNAME
SELECT @@VERSION

But when using:
SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY
('productlevel'), SERVERPROPERTY ('edition')

It returns 'NULL' for all of them.

Any explanations?
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