Re: ORDER BY not working with UNION ALL

2017-05-10 Thread Sergey Soldatov 
Well, even if you don't use family, you will get an error that column
date_time is undefined. Consider the result of UNION ALL as a separate
table and ORDER BY is applied to this table. You don't have column
date_time there. Don't forget that UNION ALL may work with different
tables, so there may be no date_time column in the second table.
So you need a construction something like :
select p.name from (select p.name, f.date_time  UNION ALL select
p.name.f.date_time  ORDER BY f.date_time LIMIT 20)

Thanks,
Sergey

On Wed, May 3, 2017 at 4:57 PM, Cheyenne Forbes <
cheyenne.osanu.for...@gmail.com> wrote:

>  I get "Undefined column family. familyName=f" whenever I run the
> following query,it works without the ORDER BY and works with the ORDER BY
> if its not a union and just one select statement
>
>SELECT
>   p.name
> FROM
>   person p
> JOIN
>   friends f
> ON
>   f.person = p.id
> WHERE
>   567 != ANY(f.persons)
> UNION ALL
> SELECT
>   p.name
> FROM
>   person p
> JOIN
>   friends f
> ON
>   f.person = p.id
> WHERE
>   123 != ANY(f.persons)
> ORDER BY f.date_time LIMIT 20
>
> Regards,
>
> Cheyenne O. Forbes
>

ORDER BY not working with UNION ALL

2017-05-03 Thread Cheyenne Forbes 
 I get "Undefined column family. familyName=f" whenever I run the following
query,it works without the ORDER BY and works with the ORDER BY if its not
a union and just one select statement

   SELECT
  p.name
FROM
  person p
JOIN
  friends f
ON
  f.person = p.id
WHERE
  567 != ANY(f.persons)
UNION ALL
SELECT
  p.name
FROM
  person p
JOIN
  friends f
ON
  f.person = p.id
WHERE
  123 != ANY(f.persons)
ORDER BY f.date_time LIMIT 20

Regards,

Cheyenne O. Forbes