[arronax]

> Of course there are "bad queries" where you query for things you don't need, join on the wrong columns, etc.

You can inject a hint into the query, forcing it to use a plan that would not otherwise be used, for example. Although, fixing a plan through a baseline is way cleaner. Mostly, I just meant that as an extreme example of something you can do, not something you should do. And yes, the only reason to re-write the query is when the query itself is bad in that it asks for unnecessary data or misses a join column. Admittedly, that's an extremely dirty and dangerous thing to do, as it uncouples app from db, but it is possible.