Name
ST_NumInteriorRing — Return the number of interior rings of the first polygon in
the geometry. Synonym to ST_NumInteriorRings.
Synopsis
integer ST_NumInteriorRing(
geometry a_polygon)
;
Description
Return the number of interior rings of the first polygon in
the geometry. Synonym to ST_NumInteriorRings. The OpenGIS specs are
ambiguous about the exact function naming, so we provide both
spellings.
This method implements the SQL/MM specification. SQL-MM 3: 8.2.5