ST_IsEmpty
ST_IsEmpty returns true if the input geometry is empty. A geometry is not empty if it contains at least one nonempty point.
ST_IsEmpty returns true if the input geometry has at least one nonempty point.
Syntax
ST_IsEmpty(geom)
Arguments
- geom
-
A value of data type
GEOMETRY
or an expression that evaluates to aGEOMETRY
type.
Return type
BOOLEAN
If geom is null, then null is returned.
Examples
The following SQL checks if the specified polygon is empty.
SELECT ST_IsEmpty(ST_GeomFromText('POLYGON((0 2,1 1,0 -1,0 2))'));
st_isempty
-----------
false