[postgis-users] function in plpgsql

[alex bodnaru]

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eehab hamzeh wrote:
> Thanks for your replay
> i need to check if the resultof this query is null or not null then do
> two different things
>  as below
> if  SELECT DISTINCT o FROM ramadan  WHERE o=mypoint or a=mypoint
> UNION SELECT DISTINCT a FROM ramadan WHERE o=mypoint or a=mypoint;
>  
> is null then
> 
look at if exists, though pay attention if it works properly with union.
also you may select into a variable, and check whether it's empty.
>  
>  
> INSERT INTO eehab (field1) -- replace with whatever your field name is
> SELECT DISTINCT o
> FROM ramadan
> WHERE o=mypoint or
> a=mypoint
> UNION SELECT DISTINCT a
> FROM ramadan
> WHERE o=mypoint or a=mypoint;
> 
>  
> else
> do some thing else
>  
>  
> can u please give me diretion to do so. i have limmited time to develop
> this function
>  
> kind regards
>  
> 
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best regards,
alex
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