If you want to find out the version of your installed PostGis, you do this:
SELECT PostGIS_full_version();
You get a row like this:
POSTGIS=”1.5.5″ GEOS=”3.3.5-CAPI-1.7.5″ PROJ=”Rel. 4.6.1, 21 August 2008″ LIBXML=”2.7.8″ USE_STATS
Versions displayed will depend on your instalation, of course.
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