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STWithin (geography Data Type)

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Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric

Returns 1 if a geography instance is spatially within another geography instance; otherwise, returns 0.

Syntax

  
.STWithin ( other_geography )

Arguments

other_geography
Is another geography instance to compare against the instance on which STWithin() is invoked.

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean

Remarks

This method always returns null if the spatial reference IDs (SRIDs) of the geography instances do not match.

Examples

The following example uses STWithin() to test two geography instances to see if the first instance is completely within the second instance.

DECLARE @g geography;  
DECLARE @h geography;  
SET @g = geography::Parse('POLYGON ((-120.533 46.566, -118.283 46.1, -122.3 47.45, -120.533 46.566))');  
SET @h = geography::Parse('CURVEPOLYGON (COMPOUNDCURVE (CIRCULARSTRING (-122.200928 47.454094, -122.810669 47.00648, -122.942505 46.687131, -121.14624 45.786679, -119.119263 46.183634), (-119.119263 46.183634, -119.273071 47.107523), CIRCULARSTRING (-119.273071 47.107523, -120.640869 47.569114, -122.200928 47.454094)))');  
SELECT @g.STWithin(@h);