Re: Extend inner join to fetch not yet connected rows also - Mailing list pgsql-general

Hi Arup,

Am Sonntag, 22. September 2019, 14:48:20 CEST schrieb Arup Rakshit:
> Hi Jan,
> 
> > On 22-Sep-2019, at 5:38 PM, Jan Kohnert <nospam001-lists@jan-kohnert.de>
> > wrote:
> > maybe something like
> > 
> > select
> > 
> >    c.id,
> >    c.name,
> >    case when cs.user_id = 8 then true else false end as has
> > 
> > from craftsmanships c
> > left join contractor_skills cs
> > 
> >    on cs.craftsmanship_id = c.craftmanship_id;
> 
> But this query fetched duplicate data:

yeah, that's possible, since I don't exactly know your data model. If only the 
values above are required, you could simply use distinct:

select distinct 
    c.id,
    c.name,
    case when cs.user_id = 8 then true else false end as has 
from craftsmanships c
left join contractor_skills cs
    on cs.craftsmanship_id = c.id
order by
   c.id;

-- 
MfG Jan