On Tue, Jan 17, 2017 at 12:37 AM, Surafel Temsgen <surafel3...@gmail.com> wrote: > I am new here and I really want to contribute, I have read same resource > that help understanding database system and postgresql. I would like to > start implementing sql syntax corresponding by clause because I believe > implementing sql syntax gives an opportunity to familiarize many part of > postgresql source code. Previous implementation is here and have an issue on > explain query and break cases on unlabeled NULLs > To repeat what a corresponding by clause means > Corresponding clause either contains a BY(...) clause or not. If it > doesn't have a BY(...) clause the usage is as follows.
This is great stuff. Does the syntax only apply to UNION? I would imagine it would also apply to INTERSECT/EXCEPT? What about UNION ALL? merlin -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
