Returns the Z coordinate of the ST_Point value.
If the point-expression is an empty geometry (ST_IsEmpty()=1), then this method returns NULL.
By default, ST_Z 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.
Syntax Returns See also Standards and compatibility Example |
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