[postgis-users] My crusade to get the real angle

[Ezequias Rodrigues da Rocha]

Thank you very much Guido,

I still want to make an if statement on psql command line.

Best regards...
Ezequias

Guido Lemoine escreveu:
> Just use a 'where' clause. This is basic SQL. Nothing to do with PostGIS.
>
> UPDATE TABLE MUB SET ANGLE = 90 – ANGLE
> WHERE ANGLE BETWEEN 0 AND 90
>
> (try lower case if this doesn't work).
>
> GL
>
> Ezequias Rodrigues da Rocha wrote:
>
>> Hi list,
>>
>> I am still on my crusade to my real angle (not azimuth). Even with 
>> the mapserver doesen't helping me with labels I am sill trying to 
>> retrieve the real angle of a linestring.
>>
>> As you should know I have the azimuth of a set of linestrings and 
>> after a radians to degree conversion I noticed that the XY system is 
>> quite different from the Azimuth system and I need to do some 
>> conversions for each quadrant.
>>
>> *So my question is:* How do I apply a if statement on 
>> Postgis/Postgresql ? I know is is not a Postgis question but I think 
>> you could help me.
>>
>> I am trying to run this command line on psql:
>>
>> select angulo from mub;
>> IF ANGLE >= 0 AND ANGLE <=90 THEN
>> UPDATE TABLE MUB SET ANGLE = 90 – ANGLE
>> END IF;
>>
>> But it does not work. Any help will be welcomed.
>>
>> Regards ...
>>
>> -- 
>> Ezequias Rodrigues da Rocha
>> http://ezequiasrocha.blogspot.com
>> msn:ezequias at hotmail.com
>> "the worst of democracies is still better than the best of dictatorship"
>>  
>>
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-- 
Ezequias Rodrigues da Rocha
http://ezequiasrocha.blogspot.com
msn:ezequias at hotmail.com
"the worst of democracies is still better than the best of dictatorship"