[postgis-users] Problem in getting geometry data

[S.Reena]

SELECT Max(f.ogc_fid) as newgid,ST_MakeLine(f.wkb_geometry) As newgeom FROM
(SELECT ogc_fid , wkb_geometry FROM track_points where ogc_fid<1020) AS f

This gives newgeom only for  ogc_fid<1020. If I omit this constraint or give
value above 1020 ,den newgeom column is empty....what can be the
problem..Can any1 suggest something 

Cheers,
Reena.
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