MySQL Reference Manual for version 4.0.18.

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17.5.2 Geometry Functions

Each function that belongs to this group takes a geometry value as its argument and returns some quantitive or qualitive property of the geometry. Some functions restrict their argument type. Such functions return NULL if the argument is of an incorrect geometry type. For example, Area() returns NULL if the object type is neither Polygon nor MultiPolygon.

17.5.2.1 General Geometry Functions  
17.5.2.2 Point Functions  
17.5.2.3 LineString Functions  
17.5.2.4 MultiLineString Functions  
17.5.2.5 Polygon Functions  
17.5.2.6 MultiPolygon Functions  
17.5.2.7 GeometryCollection Functions  



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