ST_ExteriorRing() method for type ST_Polygon

ST_ExteriorRing() method for type ST_Polygon

Returns the exterior ring of the polygon.

Note

By default, ST_ExteriorRing uses the original format for a geometry, if it is available. Otherwise, the internal format is used. For more information about internal and original formats, see STORAGE FORMAT clause, CREATE SPATIAL REFERENCE SYSTEM statement.

Syntax

polygon-expression.ST_ExteriorRing()

Returns

ST_LineString Returns the exterior ring of the polygon.
The spatial reference system identifier of the result is the same as the spatial reference system of the polygon-expression.

Standards and compatibility

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