ST_M() method for type ST_Point

Returns the m value of the ST_Point value.

Note

If the point-expression is an empty geometry (ST_IsEmpty()=1), then this method returns NULL.

Note

By default, ST_M uses the original format for a geometry, if it is available. Otherwise, the internal format is used. For more information about internal and original formats, see STORAGE FORMAT clause, CREATE SPATIAL REFERENCE SYSTEM statement.

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