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Micha, <br>
<br>
attached a txt-file with the output you asked for. Following workaround
did work for the files, which makes me think that it is not a problem
of postgresql:<br>
<br>
<br>
v.db.addcolumn map=GR_xy_wohnort col="x_arbeit double precision,
y_arbeit double precision"<br>
echo "UPDATE GR_xy_wohnort SET x_arbeit=(SELECT x_arbeit FROM
GR_xy_arbeitsort WHERE GR_xy_arbeitsort.id=GR_xy_wohnort.id)" >
help1.txt<br>
echo "UPDATE GR_xy_wohnort SET y_arbeit=(SELECT y_arbeit FROM
GR_xy_arbeitsort WHERE GR_xy_arbeitsort.id=GR_xy_wohnort.id)" >
help2.txt<br>
db.execute help1.txt<br>
db.execute help2.txt<br>
rm help2.txt<br>
rm help1.txt<br>
<br>
Cheers, Patrick<br>
<br>
<br>
On 12/03/2010 03:47 PM, Micha Silver wrote:
<blockquote cite="mid:4CF9031A.6060302@arava.co.il" type="cite">
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On 03/12/2010 16:01, Micha Silver wrote:
<blockquote cite="mid:4CF8F846.7050702@arava.co.il" type="cite">
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On 12/03/2010 09:53 AM, Patrick_schirmer wrote:
<blockquote cite="mid:4CF8A1DC.5050801@gmx.ch" type="cite">
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Thanks Micha,<br>
<br>
Yes, commands are what I typed, just renamed the filenames before
sending mail to the list:<br>
x_arbeit = x_last<br>
x_wohn = x_current<br>
<br>
<i>That syntax is an error in postgres: double precision does not
take a length qualifier.<br>
There's nothing in the v.db.join script that I can find that would add
such a thing.</i>"<br>
<br>
Is it a problem of postgres or of v.db.addcolumn which is called within
v.db.join? Can someone reproduce this mistake?<br>
</blockquote>
<br>
Well, postgresql doesn't accept a length qualifier for the type "double
precision". But the grass module v.db.addcol doesn't add any qualifier
either. So I can't see where the error is originating from.<br>
<br>
Would you mind to post the output of:<br>
v.info -c <br>
v.db.connect -p<br>
for each of the point vectors?<br>
Maybe that will give us some hint...<br>
</blockquote>
<br>
And one more test, please:<br>
db.describe table=<your vector points map><br>
<br>
<blockquote cite="mid:4CF8F846.7050702@arava.co.il" type="cite"> <br>
<blockquote cite="mid:4CF8A1DC.5050801@gmx.ch" type="cite"><br>
Cheers, Patrick<br>
<br>
<br>
<br>
On 12/01/2010 08:48 PM, Micha Silver wrote:
<blockquote cite="mid:4CF6A69F.4060905@arava.co.il" type="cite">
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Hi Patrick<br>
<br>
On 12/01/2010 05:29 PM, Patrick_schirmer wrote:
<blockquote cite="mid:4CF669BE.6060702@gmx.ch" type="cite">
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Hi, me again :-/<br>
<br>
I got two vectorfiles with points - one file representing the current
location of persons and the other one representing previous locations
of the same persons. Persons are unique and have an id which is present
in both files. I would like to calculate the distance each person has
moved. Thought it would be best doing this in the datbase.<br>
<br>
<u>my approach:</u><br>
v.db.addcolumn map=GR_xy_current col="x_current double precision,
y_current double precision, distance double precision"<br>
v.db.addcolumn map=GR_xy_last col="x_last double precision, y_last
double precision"<br>
v.to.db map=GR_xy_current option=coor col=x_current,y_current<br>
v.to.db map=GR_xy_last option=coor col=x_last,y_last<br>
v.db.join map=GR_xy_current column=id otable=GR_xy_last ocolumn=id <br>
<br>
<u>All commands will run except the last one, creating this
error:</u><br>
<br>
DBMI-Postgres driver error:<br>
Cannot execute: <br>
ALTER TABLE GR_xy_current ADD COLUMN x_arbeit DOUBLE PRECISION(8)<br>
ERROR: syntax error at or near "("<br>
LINE 1: ... TABLE GR_xy_current ADD COLUMN x_arbeit DOUBLE PRECISION(8)<br>
^<br>
</blockquote>
ERROR: Error while executing: 'ALTER TABLE GR_xy_current ADD COLUMN<br>
<blockquote cite="mid:4CF669BE.6060702@gmx.ch" type="cite">
x_last
DOUBLE PRECISION(8)'<br>
ERROR: Unable to add column <x_last DOUBLE PRECISION(8)>.<br>
ERROR: Error creating column <x_last>.<br>
<br>
<br>
datbase: PG; Grass-version 7.0<br>
</blockquote>
<br>
</blockquote>
<br>
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