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PostGIS 1.5.8 Manual99 / 310See AlsoST_Boundary, ST_NumInteriorRings7.4.8 ST_GeometryNST_GeometryN — Return the 1-based Nth geometry if the geometry is a GEOMETRYCOLLECTION, MULTIPOINT, MUL-TILINESTRING, MULTICURVE or MULTIPOLYGON. Otherwise, return NULL.Synopsisgeometry ST_GeometryN(geometry geomA, integer n);DescriptionReturn the 1-based Nth geometry if the geometry is a GEOMETRYCOLLECTION, MULTIPOINT, MULTILINESTRING,MULTICURVE or MULTIPOLYGON. Otherwise, return NULL.NoteIndex is 1-based as for OGC specs since version 0.8.0. Previous versions implemented this as 0-based instead.NoteIf you want to extract all geometries, of a geometry, ST_Dump is more efficient and will also work for singular geoms.This method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1.This method implements the SQL/MM specification. SQL-MM 3: 9.1.5This function supports 3d and will not drop the z-index.This method supports Circular Strings and CurvesExamples--Extracting a subset of points from a 3d multipointSELECT n, ST_AsEWKT(ST_GeometryN(the_geom, n)) As geomewktFROM (VALUES (ST_GeomFromEWKT(’MULTIPOINT(1 2 7, 3 4 7, 5 6 7, 8 9 10)’) ),( ST_GeomFromEWKT(’MULTICURVE(CIRCULARSTRING(2.5 2.5,4.5 2.5, 3.5 3.5), (10 11, 12 11))’) ))As foo(the_geom)CROSS JOIN generate_series(1,100) nWHERE n
PostGIS 1.5.8 Manual100 / 3103 | POINT(5 6 7)4 | POINT(8 9 10)1 | CIRCULARSTRING(2.5 2.5,4.5 2.5,3.5 3.5)2 | LINESTRING(10 11,12 11)--Extracting all geometries (useful when you want to assign an id)SELECT gid, n, ST_GeometryN(the_geom, n)FROM sometable CROSS JOIN generate_series(1,100) nWHERE n
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