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rhishi20

Suggest website for best practice of sql queries

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Why not just practice using your own examples and get help when you need it?

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There are a number of sample databases available online but less in the way of teaching best practices. Most tutorials are simply focused on teaching all of the available operations that can be performed without regard for the effect these operations might have on system performance. In order to improve system performance you might be creating indexes or temporary tables or taking other steps to limit operations that create large disruptive transactions. Oracle seems to have some material discussing this sort of thing and I'm sure the broad techniques are applicable to any relational database.

 

http://docs.oracle.com/cd/B19306_01/server.102/b14211/technique.htm

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