MI SQL puzzle

[Agustin Estrada-pe�a]

Hi everybody,

 

I have two lists:

- list A are polylines (land cover boundaries) 

- list B are points (codes for the land cover characteristics, these points are located in the same position as the centroids of polylines from list A) 

 

I nee to select the polylines from attributes in the points list. I was using SQL, selecting the B.obj's that contain A.obj's with the desired attributes. The results: no element was selected. I believe no elements were returned because polylines are "open" and not contain anything.

 

Does anybody knows how I can select these polylines based on points attributes?

 

Thanks for your help.

 

Agustin

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Prof. Agustin Estrada-Pena
Dept. of Animal Pathology (Parasitology)
University of Zaragoza (Spain)