Re: Many to many join seems slow?

2007/5/15, Drew Wilson <drewmwilson(at)gmail(dot)com>:
> =# explain SELECT s.source_id, s.value AS sourceValue, t.value AS
> translationValue
> FROM
> source s,
> translation_pair tp,
> translation t,
> language l
> WHERE
> s.source_id = tp.source_id
> AND tp.translation_id = t.translation_id
> AND t.language_id = l.language_id
> AND l.name = 'French' ;
>
> QUERY PLAN
> ------------------------------------------------------------------------
> -----------------------------------------------------
> Merge Join (cost=524224.49..732216.29 rows=92447 width=97)

This way you get all word matches for the French language. Shouldn't
it be all matches for a specific word (s.value = 'word' in WHERE)?

--
Daniel Cristian Cruz