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    ApsaraDB RDS:ST_Disjoint

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    ApsaraDB RDS:ST_Disjoint

    Last Updated:Mar 28, 2026

    Returns true if two geometry objects share no points in common, and false otherwise.

    Syntax

    boolean ST_Disjoint(geometry a, geometry b);

    Parameters

    ParameterDescription
    aThe first geometry object.
    bThe second geometry object.

    Return value

    boolean

    • Returns true if the two geometry objects are disjoint (no shared points).

    • Returns false if the objects share one or more points.

    Usage notes

    • ST_Disjoint(A, B) is equivalent to A ∩ B = ∅. If any Overlap, Touch, or Within condition holds for the two objects, the function returns false.

    • This function does not use indexes.

    Examples

    SELECT ST_Disjoint(
  'LINESTRING(0 0,-3 -3)'::geometry,
  'LINESTRING(0 1,1 0)'::geometry
);
     st_disjoint
-------------
 t
(1 row)