In my opinion this should work:
SELECT ST_AsGeoJson(ST_MakePoint(1,2))
or: SELECT ST_AsGeoJson(ST_MakePoint(1,2)::geometry)
however, it produces:
--------------
ERROR: function st_asgeojson(geometry) is not unique
LINE 1: SELECT ST_AsGeoJson(ST_MakePoint(1,2))
^
HINT: Could not choose a best candidate function. You might need to add
explicit type casts.
--------------
This does work:
SELECT ST_AsGeoJson(ST_MakePoint(1,2),0,0)
My postgis version:
"POSTGIS="2.0.1 r9979" GEOS="3.3.5-CAPI-1.7.5" PROJ="Rel. 4.8.0, 6 March
2012" GDAL="GDAL 1.9.1, released 2012/05/15" LIBXML="2.7.8" TOPOLOGY RASTER"
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