[postgis-users] Extents

René F. Viancos S. rviancos at gmail.com
Sat Oct 15 06:46:04 PDT 2005

Try SELECT BOUNDARY(the_geom) From trails_02a WHERE objectid = 1 OR objectid
= 2 OR objectid = 3;

Then AND condition makes always false the Query and never returns any
recordset. Does not exists an element that has tree objectid in the same
time. Think the AND operator like Intersection of elements and OR operator
like the union of elements. Sorry, i dont see this before.


René F. Viáncos S.
Director de Geomática y TIC
Vicerrectoría de Investigación y Desarrollo
Universidad de Chile
Tel (56-2) 632 51 15
Cel (56 9) 933 72 66
rviancos at uchile.cl
rviancos at gmail.com
www.investigacion.uchile.cl <http://www.investigacion.uchile.cl>
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