Wow, this joined query is super faster then intersect(10x), thanks a lot!!
Regarding that I have to make a join for every term, I would think it would be more consuming. Is there any limit of joins or something similar which I should be aware of?
Sebastjan
On 1/20/06, Michael Glaesemann <grzm@myrealbox.com> wrote:
On Jan 20, 2006, at 22:19 , Sebastjan Trepca wrote:
> What I would like is to write a query where I can specify multiple
> names and get the IDs which have them.
>
> For now it seems the most efficient way is to use INTERSECT statement:
>
> SELECT "ID" from customer_mapping WHERE "Name"='john'
> INTERSECT
> SELECT "ID" from customer_mapping WHERE "Name"='peter'
My first thought is to use a join. Does this do what you want?
select id
from customer_mapping cm1
join customer_mapping cm2 using ("ID")
where cm1."Name" = 'john
and cm2."Name" = 'peter';
> Although, I don't know how exactly to use ORDER, OFFSET and LIMIT
> in this case...
ORDER, OFFSET and LIMIT should work just fine with the JOIN query.
You could also use your intersect in a subquery and then use ORDER,
OFFSET and LIMIT on the outer query, e.g.,
select *
from (
select "ID"...
intersect
select "ID" ...
) as common_names
...
Michael Glaesemann
grzm myrealbox com
