| title | STIntersection (geometry Data Type) | ||
|---|---|---|---|
| description | STIntersection (geometry Data Type) | ||
| author | MladjoA | ||
| ms.author | mlandzic | ||
| ms.date | 08/03/2017 | ||
| ms.service | sql | ||
| ms.subservice | t-sql | ||
| ms.topic | reference | ||
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| monikerRange | =azuresqldb-current || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb |
[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance FabricSQLDB]
Returns an object that represents the points where a geometry instance intersects another geometry instance.
.STIntersection ( other_geometry )
other_geometry
Is another geometry instance to compare with the instance on which STIntersection() is being invoked, to determine where they intersect.
[!INCLUDEssNoVersion] return type: geometry
CLR return type: SqlGeometry
STIntersection() always returns null if the spatial reference IDs (SRIDs) of the geometry instances do not match. The result may contain circular arc segments only if the input instances contain them.
The following example uses STIntersection() to compute the intersection of two polygons.
DECLARE @g geometry;
DECLARE @h geometry;
SET @g = geometry::STGeomFromText('POLYGON((0 0, 0 2, 2 2, 2 0, 0 0))', 0);
SET @h = geometry::STGeomFromText('POLYGON((1 1, 3 1, 3 3, 1 3, 1 1))', 0);
SELECT @g.STIntersection(@h).ToString(); The following example returns an instance that contains a circular arc segment.
DECLARE @g geometry = 'CURVEPOLYGON (CIRCULARSTRING (0 -4, 4 0, 0 4, -4 0, 0 -4))';
DECLARE @h geometry = 'POLYGON ((1 -1, 5 -1, 5 3, 1 3, 1 -1))';
SELECT @h.STIntersection(@g).ToString();