There are 2 kinds of rules in this document: for joins and for set
operations.
As for joins, I think they are all about *inner* joins. Postgres (IMO)
"implements" them by not doing anything special if query only contains
inner joins.
On the other hand, attention has to be paid if there's at least
"where" means, which function or which part of source code.
I want to use that(function or part of source code), to produce the
equivalence
(based on equivalence rules in attachment) Relational Algebra
for a given SQL query(Relational Algebra).
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
capabilities.
SQL is not purely relational in nature so som
