Categories:: Geospatial Functions

ST_COVEREDBY¶

This returns TRUE if no point in one geospatial object is outside another geospatial object. In other words:

GEOGRAPHY object g1 is outside GEOGRAPHY object g2.
GEOMETRY object g1 is outside GEOMETRY object g2.

This is equivalent to ST_COVERS(g2, g1).

Although ST_COVEREDBY and ST_WITHIN might seem similar, the two functions have subtle differences. For details on the differences between “covered by” and “within”, see the Dimensionally Extended 9-Intersection Model (DE-9IM).

Note

This function does not support using a GeometryCollection or FeatureCollection as input values.

See also:: ST_COVERS , ST_WITHIN

Syntax¶

ST_COVEREDBY( <geography_expression_1> , <geography_expression_2> )

ST_COVEREDBY( <geometry_expression_1> , <geometry_expression_2> )

Arguments¶

geography_expression_1: A GEOGRAPHY object that is not a GeometryCollection or FeatureCollection.
geography_expression_2: A GEOGRAPHY object that is not a GeometryCollection or FeatureCollection.
geometry_expression_1: A GEOMETRY object that is not a GeometryCollection or FeatureCollection.
geometry_expression_2: A GEOMETRY object that is not a GeometryCollection or FeatureCollection.

Returns¶

BOOLEAN.

Usage Notes¶

For GEOMETRY objects, the function reports an error if the two input GEOMETRY objects have different SRIDs.

Examples¶

GEOGRAPHY Examples¶

This shows a simple use of the ST_COVEREDBY function:

create table geospatial_table_01 (g1 GEOGRAPHY, g2 GEOGRAPHY);
insert into geospatial_table_01 (g1, g2) values 
    ('POLYGON((0 0, 3 0, 3 3, 0 3, 0 0))', 'POLYGON((1 1, 2 1, 2 2, 1 2, 1 1))');

SELECT ST_COVEREDBY(g1, g2) 
    FROM geospatial_table_01;
+----------------------+
| ST_COVEREDBY(G1, G2) |
|----------------------|
| False                |
+----------------------+