Hi,
On 11 November 2011 00:04, Jay Levitt <jay.levitt@gmail.com> wrote:
> Sometimes the planner can't find the most efficient way to execute your
> query. Thanks to relational algebra, there may be other, logically
> equivalent queries that it DOES know how to optimize.
>
> But I don't know relational algebra. yet. (Date/Codd is a sleeping pill.)
> I need more experience first.
>
> Are there blogs, guides, rules of thumb, common refactoring patterns out
> there somewhere? I'm looking for a list of basic equalities, the SQL
> equivalent of:
Have a look here: http://en.wikipedia.org/wiki/Relational_algebra
plus "External links" section
--
Ondrej Ivanic
(ondrej.ivanic@gmail.com)
