Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025. If you would like to use Python UDFs, create the UDFs prior to that date. Existing Python UDFs will continue to function as normal. For more information, see the blog post .

ST_MMin

ST_MMin returns the minimum m coordinate of an input geometry.

Syntax

ST_MMin(geom)

Arguments

Return type

DOUBLE PRECISION value of the minimum m coordinate.

If geom is empty, then null is returned.

If geom is null, then null is returned.

If geom is a 2D or 3DZ geometry, then null is returned.

Examples

The following SQL returns the smallest m coordinate of a linestring in a 3DM geometry.

SELECT ST_MMin(ST_GeomFromEWKT('LINESTRING M (0 1 2, 3 4 5, 6 7 8)'));

st_mmin
-----------
  2               

The following SQL returns the smallest m coordinate of a linestring in a 4D geometry.

SELECT ST_MMin(ST_GeomFromEWKT('LINESTRING ZM (0 1 2 3, 4 5 6 7, 8 9 10 11)'));

st_mmin
-----------
  3