Re: Performance trouble finding records through related records - Mailing list pgsql-performance

Andy Colson wrote:
>
> For your query, I think a join would be the best bet, can we see its
> explain analyze?
>


Here is a few variations:


SELECT events_events.* FROM events_events WHERE transactionid IN (
    SELECT transactionid FROM events_eventdetails customerDetails
    WHERE customerDetails.keyname='customer_id'
    AND substring(customerDetails.value,0,32)='1957'
    AND transactionid IS NOT NULL
) ORDER BY id LIMIT 50;

-- http://explain.depesz.com/s/Pnb


explain analyze SELECT events_events.* FROM events_events,
events_eventdetails customerDetails
    WHERE events_events.transactionid = customerDetails.transactionid
    AND customerDetails.keyname='customer_id'
    AND substring(customerDetails.value,0,32)='1957'
    AND customerDetails.transactionid IS NOT NULL
ORDER BY id LIMIT 50;

-- http://explain.depesz.com/s/rDh


explain analyze SELECT events_events.* FROM events_events
JOIN events_eventdetails customerDetails
    ON events_events.transactionid = customerDetails.transactionid
    AND customerDetails.keyname='customer_id'
    AND substring(customerDetails.value,0,32)='1957'
    AND customerDetails.transactionid IS NOT NULL
ORDER BY id LIMIT 50;

-- http://explain.depesz.com/s/6aB


Thanks for your efforts!

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