Changes between Version 16 and Version 17 of DevWikiEmptyGeometry


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Timestamp:
Oct 6, 2009, 12:35:27 PM (15 years ago)
Author:
chodgson
Comment:

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  • DevWikiEmptyGeometry

    v16 v17  
     1= EMPTY GEOMETRY Handling =
     2
    13The semantics of NULL are well defined for us already in SQL standards. However, in the world of Geometry / Geography we have another entity which is not quite NULL nor quite fully defined: the empty geometry. Empty geometries can be created with things like intersection calls that have have no intersection, e.g. ST_Intersect('POINT(0 0)', 'POINT(1 1)') == POINT EMPTY. So, in the presence of empty, how should functions behave?
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