Jonas Sandman wrote:
> But I guess the answer is that only the "where" parts should be
> indexed, not the id's in the joins?
No, that's generally not true. ON clauses in joins are basically a syntactic
sugar (though there's a subtle difference in case of outer joins). These three
statements are equivalent:
select * from animals a
join animaltype at on at.id=a.typeid
where a.name='Monkey' and a.subspecies=2;
select * from animals a, animaltype at
where a.name='Monkey' and a.subspecies=2 and at.id=a.typeid;
select * from animals a join animaltype at on (
at.id=a.typeid and a.name='Monkey' and a.subspecies=2);
So, whether a particular condition is in WHERE clause or in ON clause is
immaterial.
Igor Tandetnik
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