Returns the m value of the ST_Point value.
If the point-expression is an empty geometry (ST_IsEmpty()=1), then this method returns NULL.
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.
Syntaxpoint-expression.ST_M() ReturnsDOUBLE Returns the m value of the ST_Point value.
Standards and compatibilitySQL/MM (ISO/IEC 13249-3: 2006) 6.1.6
ExampleThe following example returns the result 40.0.
SELECT NEW ST_Point( 10.0, 20.0, 30.0, 40.0, 0 ).ST_M() |
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