| From: | Thom Brown <thombrown(at)gmail(dot)com> |
|---|---|
| To: | Stefan Schwarzer <stefan(dot)schwarzer(at)grid(dot)unep(dot)ch> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Subqueries or Joins? Problems with multiple table query |
| Date: | 2010-02-23 13:46:16 |
| Message-ID: | bddc86151002230546n6fef7acag70e41b60503bc84d@mail.gmail.com |
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| Lists: | pgsql-general |
On 23 February 2010 13:43, Stefan Schwarzer
<stefan(dot)schwarzer(at)grid(dot)unep(dot)ch> wrote:
>>>> Select countries.name, basel.year, basel.value, cites.year, cites.value
>>>> From countries
>>>> Left Join basel on basel.id_country = countries.id_country and
>>>> basel.value=1
>>>> Left Join cites on cites.id_country = countries.id_country and
>>>> cites.value=1
>>>
>>> I would have thought so, but the query turns forever.
>>
>> How many rows in each of your tables, and what indexes do you have?
>
> around 5000 rows
>
It takes a long time for just 5000 rows? Could you provide the
execution plan for it by putting EXPLAIN ANALYZE at the front of your
query and post the result here?
Thom
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