Please sugges the link helpful for writing efficient sql queries

Please suggest any good resource that is weblink which can help me in optimizing sql queries. especially while writing select statements improve the execution time of the sql query.
Thanx in advance
prasanth

in general I found books from O'Reilly very helpful (not only for Oracle, but for Unix too).
Moreover there is pretty good Oracle Documentation available.
After all, it's not only about writing good queries, but also about setting up data-models, indexes, primary keys, etc.
Look for a real slow computer, take a lot of data, then try writing your speedy queries. This is the school of hard knocks, on the long run it's the best training.

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