Ali Piroozi wrote
> Hi
> Which equivalence rule from those are listed in
> email's attachment are implemented in postgresql?
> where are them?

What do you mean by "where"?

The various JOINS and UNION/INTERSECT/DIFFERENCE are all defined

SQL is not purely relational in nature so some of the mathematical rules may
not be exactly implemented as theory would dictate but largely they are

I would suggesting providing more context as to why you are asking this as
people are more likely to provide help at this level of technical depth if
they know why; and can frame their answers more appropriately.

David J.

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