Re: [HACKERS] is it possible to use LIMIT and INTERSECT ?

Oleg Bartunov wrote:
>
> Tom,
>
> patch was applied smoothly to 6.5.2
> What's the syntax ?
>
> select a.msg_id, c.status_set_date, c.title
> from Message_Keyword_map a, messages c, keywords d
> where c.status_id =1 and d.name ~* 'moon' and a.key_id=d.key_id
> and c.msg_id=a.msg_id
> intersect
> select a.msg_id, a.status_set_date, a.title from messages a
> where a.status_id = 1 and a.title ~* 'moon' limit 5;
>
> produces (10 rows)
>
> select a.msg_id, c.status_set_date, c.title
> from Message_Keyword_map a, messages c, keywords d
> where c.status_id =1 and d.name ~* 'moon' and a.key_id=d.key_id
> and c.msg_id=a.msg_id limit 5
> intersect
> select a.msg_id, a.status_set_date, a.title from messages a
> where a.status_id = 1 and a.title ~* 'moon' limit 5;
>

As the limit is applied to the final result, I guess you can have only one
LIMIT per query.

So try removing the limit 5 before intersect .

-----------
Hannu