1 Feb
2016
1 Feb
'16
4:32 p.m.
2016-02-01 16:29 GMT+01:00 Anne Etien <anne.etien(a)univ-lille1.fr>fr>:
Le 1 févr. 2016 à 08:09, stepharo <stepharo(a)free.fr> a écrit :
Where? because I spent a couple of hours I only found SQL92
http://savage.net.au/SQL/
SQL-92, -99, -2003
Excellent!
Thanks I will archive that.
I am not an expert in grammar, but I don’t see on this page the rules
relative to function or even to select query.
First one, just a search on SELECT in the web page:
<query specification> <http://savage.net.au/SQL/sql-92.bnf.html#xref-query
specification> ::=
SELECT <http://savage.net.au/SQL/sql-92.bnf.html#xref-SELECT>[ <set
quantifier> <http://savage.net.au/SQL/sql-92.bnf.html#set quantifier> ]
<select
list> <http://savage.net.au/SQL/sql-92.bnf.html#select list> <table
expression> <http://savage.net.au/SQL/sql-92.bnf.html#table expression>
Thierry
Anne
But the point wasn't that; what a LALR/LR parser gives you is a
grammar ambiguity and conflicts... PetitParser will happily take your
grammar ans you will only discover when parsing something that it
doesn't do what you would like.
(The reference citation of Aho and Ullman is ... it may be difficult
to determine what the language is).
So since you have a grammar, use LALR to check it.
But as I said we do not have it.
You do have a PEG grammar in your PetitParser efforts, since you have been
working on it. From far, those grammars are very much like other
grammars... just that the parser generator behave differently when you have
conflicts and ambiguity.
Thierry
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