Hi,
This error is normal. You can not use a group by clause with an aggregate
function and keep all of single records from your original database. Which one
will you choose to keep for each unique n-street value ?
To do that you can use two different tricks (but your table will have as many
lines as you have unique couple n_street/the_geom):
Using "with" with a join
With my_union as (
select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) my_union_geom
from streets
group by n_street)
select n_street, my_union_geom, ST_Parallel(the_geom,-3.0,0,0) my_single_geom
from my_union a
join streets b on a.n_street = b.n_street
or using an over function (not totally sure of this particular request but the
window function can certainly help you in this case)
select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) ,
ST_Parallel(the_geom,-3.0,0,0))over(partition by n_street)
from streets
group by n_street
Hugues.
--
-----Message d'origine-----
De : postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] De la part de Pedro Costa
Envoyé : vendredi 11 mai 2012 10:30
À : PostGIS Users Discussion
Objet : Re: [postgis-users] st_offsetcurve
Ups, sorry...
The whole sql:
create table test4 as
(select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) ,
(ST_Parallel(the_geom,-3.0,0,0))
from streets
group by n_street)
Em 11-05-2012 00:03, Simon Greener escreveu:
> Pedro,
>
>> greate. The funcion works.
>>
>> I'm doing something like that:
>>
>> ST_Parallel(the_geom,3.0,0,0)
>>
>> but give me error:
>>
>> column "streetss.the_geom" must appear in the GROUP BY clause or be used
>> in an aggregate function
>>
>> anybody know the problem?
>
> Not without the whole SQL statement.
>
> S
>>
>> thanks
>>
>>
>> Em 10-05-2012 04:40, Simon Greener escreveu:
>>> Folks,
>>>
>>> Sorry about that. The file:
>>>
>>> http://www.spatialdbadvisor.com/file_download/55/PostGIS_Parallel.sql
>>>
>>> Did not contain all the required types and functions. One needed also
>>> to access the types and functions for my ST_GetVector function.
>>>
>>> I have now included all the required types and related functions in
>>> the above script and replaced it on my site.
>>>
>>> I have changed a bit in the code as it didn't handle some situations
>>> as I expected. Hopefully my test cases give good coverage.
>>>
>>> My tests, conducted on PostgreSQL 9.1 and PostGIS 2.0 on Windows 7 64
>>> Bit all work as this example shows:
>>>
>>> With geometries As (
>>> select ST_GeomFromText('LINESTRING(1 1,1 10)') as geom,
>>> 10.0 as offset,2 as roundFactor,0 as curved
>>> union all select ST_GeomFromText('LINESTRING(0 0,1 1,1 2)') as geom,
>>> 0.5 as offset,2 as roundFactor,
>>> generate_series(0,1,1) as curved
>>> union all select ST_GeomFromText('LINESTRING(0.0 0.0, 45.0 45.0, 90.0
>>> 0.0, 135.0 45.0, 180.0 0.0, 180.0 -45.0, 45.0 -45.0, 0.0 0.0)') as
>>> geom,
>>> 10.0 as offset,2 as roundFactor,
>>> generate_series(0,1,1) as curved
>>> union all select ST_GeomFromText('MULTILINESTRING((0 0,1 1,1 2),(2 3,3
>>> 2,5 4))') as geom,
>>> 0.5 as offsetRight,2 as roundFactor,
>>> generate_series(0,1,1) as curved
>>> )
>>> select ST_AsText(g.geom) as origGeom, g.offset,g.curved,
>>> ST_AsText(ST_Parallel(g.geom,g.offset,g.roundFactor,g.curved))
>>> as geomWKTLeft,
>>>
>>> ST_AsText(ST_Parallel(g.geom,0.0-g.offset,g.roundFactor,g.curved)) as
>>> geomWKTRight
>>> from geometries as g;
>>>
>>> "LINESTRING(1 1,1 10)";10.0;0;"LINESTRING(11 1,11 10)";"LINESTRING(-9
>>> 1,-9 10)"
>>> "LINESTRING(0 0,1 1,1 2)";0.5;0;"LINESTRING(0.35 -0.35,1.5 0.79,1.5
>>> 2)";"LINESTRING(-0.35 0.35,0.5 1.21,0.5 2)"
>>> "LINESTRING(0 0,1 1,1 2)";0.5;1;"COMPOUNDCURVE((0.35 -0.35,1.35
>>> 0.65),CIRCULARSTRING(1.35 0.65,1.46 0.81,1.5 1),(1.5 1,1.5
>>> 2))";"LINESTRING(-0.35 0.35,0.5 1.21,0.5 2)"
>>> "LINESTRING(0 0,45 45,90 0,135 45,180 0,180 -45,45 -45,0
>>> 0)";10.0;0;"LINESTRING(7.07 -7.07,45 30.86,90 -14.14,135 30.86,170
>>> -4.14,170 -35,49.14 -35,7.07 7.07)";"LINESTRING(-7.07 7.07,45 59.14,90
>>> 14.14,135 59.14,190 4.14,190 -55,40.86 -55,-7.07 -7.07)"
>>> "LINESTRING(0 0,45 45,90 0,135 45,180 0,180 -45,45 -45,0
>>> 0)";10.0;1;"COMPOUNDCURVE((7.07 -7.07,45 30.86,82.93
>>> -7.07),CIRCULARSTRING(82.93 -7.07,90 -10,97.07 -7.07),(97.07
>>> -7.07,134.71 31.15,170 -4.14,170 -35,49.14 -35,7.07
>>> 7.07))";"COMPOUNDCURVE((-7.07 7.07,37.93 52.07),CIRCULARSTRING(37.93
>>> 52.07,45 55,52.07 52.07),(52.07 52.07,89.71 13.85,127.93
>>> 52.07),CIRCULARSTRING(127.93 52.07,135 55,142.07 52.07),(142.07
>>> 52.07,187.07 7.07),CIRCULARSTRING(187.07 7.07,189.16 4.01,190 0),(190
>>> 0,190 -45),CIRCULARSTRING(190 -45,187.13 -52.01,180 -55),(180 -55,45
>>> -55),CIRCULARSTRING(45 -55,41.27 -54.28,37.93 -52.07),(37.93
>>> -52.07,-7.07 -7.07))"
>>> "MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5
>>> 4))";0.5;0;"MULTILINESTRING((1.65 2.65,3 1.29,5.35
>>> 3.65))";"MULTILINESTRING((2.35 3.35,3 2.71,4.65 4.35))"
>>> "MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5 4))";0.5;1;"MULTICURVE((1.65
>>> 2.65,2.65 1.65),CIRCULARSTRING(2.65 1.65,3 1.5,3.35 1.65),(3.35
>>> 1.65,5.35 3.65))";"MULTILINESTRING((2.35 3.35,3 2.71,4.65 4.35))"
>>>
>>> Sorry for any inconvenience.
>>>
>>> The file is available for download via the link above.
>>>
>>> regards
>>> Simon
>>>
>>>
>>> On Wed, 09 May 2012 23:27:04 +1000, Pedro Costa
>>> <pedrocostaa...@sapo.pt> wrote:
>>>
>>>> No problem Hugues.
>>>>
>>>> Give me the same error:
>>>>
>>>> ERROR: function st_parallel(geometry, numeric, numeric, integer) does
>>>> not exist
>>>> LINE 1: select ST_Parallel(the_geom, 3.0, 0.0, 0) as test from tests
>>>>
>>>>
>>>>
>>>> Em 09-05-2012 13:48, Francois Hugues escreveu:
>>>>> Sorry, I read your message too fast and forgot the PS.
>>>>>
>>>>> Maybe you could try something like :
>>>>> select ST_Parallel(the_geom, 3.0, 0.0, 0) as test from tests
>>>>>
>>>>> Hugues.
>>>>>
>>>>>
>>>>>
>>>>> -----Message d'origine-----
>>>>> De : postgis-users-boun...@postgis.refractions.net
>>>>> [mailto:postgis-users-boun...@postgis.refractions.net] De la part de
>>>>> Pedro Costa
>>>>> Envoyé : mercredi 9 mai 2012 13:06
>>>>> À : PostGIS Users Discussion
>>>>> Objet : Re: [postgis-users] st_offsetcurve
>>>>>
>>>>> Em 09-05-2012 11:28, Pedro Costa escreveu:
>>>>>> PS: I´m already install the function by your file
>>>>> I'm already do that...
>>>>> _______________________________________________
>>>>> postgis-users mailing list
>>>>> postgis-users@postgis.refractions.net
>>>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>>> _______________________________________________
>>>>> postgis-users mailing list
>>>>> postgis-users@postgis.refractions.net
>>>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>>
>>>> _______________________________________________
>>>> postgis-users mailing list
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>>>>
>>>
>>>
>>
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>
>
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