Is there alternative way to write this query?

Posted by Kugel on Stack Overflow See other posts from Stack Overflow or by Kugel
Published on 2010-06-06T23:03:22Z Indexed on 2010/06/06 23:12 UTC
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exists

I have tables A, B, C, where A represents items which can have zero or more sub-items stored in C. B table only has 2 foreign keys to connect A and C.

I have this sql query:

select * from A
where not exists (select * from B natural join C where B.id = A.id and C.value > 10);

Which says: "Give me every item from table A where all sub-items have value less than 10.

Is there a way to optimize this? And is there a way to write this not using exists operator?

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