>
> appears to want two input parameters, so I'm not surprised that
> f_strblob('X') doesn't work.

Hm, not quite. Provided 'data' is a blob column, the statement

select f_strblob('X',data) from sampleattachment

returns:

Function F_STRBLOB could not be matched
Statement: select f_strblob('X',data) from sampleattachment

As a general question, is it possible to have an UDF that gets some
input and returns a BLOB as a *result*, not like a VAR parameter in
pascal?

Mirco