Ok, I understand now.
you need to use advanced view to edit the recordset.
in advanced view the recordset will look like this:
SELECT * FROM blog WHERE BlogID = colname ORDER BY BlogID DESC
and in the variables section will be the colname variable as:
Name: colname
type: integer
Default Value: -1
runtime Value: $_GET['BlogID']
edit the recordset to:
SELECT * FROM blog WHERE (BlogID = colname) OR (colname2 = -1) ORDER BY BlogID DESC
and create another variable as:
Name: colname2
type: integer
Default Value: -1
runtime Value: $_GET['BlogID']