Ravi, Still not quite clear what question you are trying to answer. I am guessing that you are getting duplicates because you have a one to many going on here. But I'm not sure which is the one and which is the many. Also you don't need coalesce here since that is only useful if you expect one of your fields to be null. In this case since you are doing an inner join, neither will be NULL. Or perhaps you don't want to do an inner join. It might be that you really want to use the aggregate form of geomunion Something like SELECT strubuf.struclass, geomunion(geof.geometry) AS geofac FROM geof INNER JOIN strubuf ON (geof.geometry && strubuf.geometry AND intersects(strubuf.geometry, geof.geometry)) GROUP BY strubuf.struclass Just a guess. But perhaps that doesn't answer the question you were trying to ask.
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of RAVI KUMAR Sent: Tuesday, September 11, 2007 6:26 AM To: [EMAIL PROTECTED] Cc: postgis Subject: [postgis-users] UNION Hi, I have prepared a course material for training in Jump for Geoscientists. Added a minerological theme in which the final output results in prospectivity map. I have used Post-GIS where ever complex bullion operators are needed. This was done smoothly. But Iam now held-up in UNION and Intersection. Jump gives an OVERLAY which equals intersection. But the problem needs both Intersected portion and Non intersecting portion together. Followed the advise given on this list to get the result. But the result OPENJUMP 1.Overlay Layers A, B 2. Make union of the result (to use as a mask) 3. A-Union and B-union and combine theses two layers 4. Add Overlay to this. This does the work but you have duplicate geometries which are filled with different attributes in different instances. POSTGIS: Followinf the suggestions on the Postgis list I have tried this query. SELECT strubuf.struclass, COALESCE(geomunion(strubuf.geometry, geof.geometry), geof.geometry) AS geofac FROM geof INNER JOIN strubuf ON (geof.geometry && strubuf.geometry AND intersects(strubuf.geometry, geof.geometry)); But this doesnt result in a table geofac This is where I am.. But for this additional exercise every thing else is ready. However Proof of Concept for Geoscientists lies in THIS. Cheers Ravi Kumar ________________________________ Be a better Heartthrob. Get better relationship answers <http://us.rd.yahoo.com/evt=48255/*http://answers.yahoo.com/dir/_ylc=X3o DMTI5MGx2aThyBF9TAzIxMTU1MDAzNTIEX3MDMzk2NTQ1MTAzBHNlYwNCQUJwaWxsYXJfTkl fMzYwBHNsawNQcm9kdWN0X3F1ZXN0aW9uX3BhZ2U-?link=list&sid=396545433> from someone who knows. Yahoo! Answers - Check it out. ----------------------------------------- The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer.
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