Hi,
I need a possibilty that a table "wald_by" will be updatet WHERE my
counter "i" is an even number?!
UPDATE wald_by
SET the_geom = the_geom -
ST_Intersection(poly.the_geom,ST_Expand(pt.the_geom, 2000))
FROM public.wald_by poly, public.holzfaeller pt, public.runden i
WHERE poly.the_geom && ST_Expand(pt.the_geom, 2000) AND pt.style=2 AND*
i/5=2*;
i/5=2 ???--> That mean: this UPDATE should be done if i=[10, 20, 30,
40...] !!!!
And WHERE "i" is another number nothing should be done-->the_geom=the_geom
the_geom is a forest area where forest will be cut, and after 10 rounds
the area of the cut down area should be deducted from the original
forest area-->the forest will be smaller after 10 rounds!
There are two modes of lumberjacks, the one mode(pt.style=1) he cut down
the wood regenerative and the other one is clearing the forest
completely-->the area should be deducted.
"i" will be stored every round in one table: "runden" and every round
this SQL will be done:
UPDATE runden SET i=i+1;
Are there any ideas?
--daniel
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