VOQL sessions in Beijing and DAL-VOQL joint sessions
Alex Szalay
szalay at jhu.edu
Fri May 4 13:38:18 PDT 2007
http://sqlbible.tar.hu/sqlbible0099.html
on ORACLE -- indeed not strictly verbatim compliant, but
by and large has the same functionality. The above links
show the translation
--Alex
-----Original Message-----
From: owner-voql-teg at eso.org [mailto:owner-voql-teg at eso.org] On Behalf Of
Doug Tody
Sent: Friday, May 04, 2007 1:52 PM
To: Francois Ochsenbein
Cc: voql-teg at ivoa.net
Subject: Re: VOQL sessions in Beijing and DAL-VOQL joint sessions
On Fri, 4 May 2007, Francois Ochsenbein wrote:
> I could try to talk about the metadata requirements -- but the
> information_schema being something existing almost only in SQL server,
> I don't feel it would be wise to insist on this solution.
>
> Cheers, francois
Probably the implementation of information_schema is pretty mixed, although
I got the impression that MySQL and PostgreSQL have a pretty good
implementation as well, and possibly DB2 and INFORMIX (but not Oracle
evidently). And of course SQL Server.
I suggest we consider the issue of an information_schema like approach, and
the issue of whether to use the information_schema specification directly,
as two separate issues. The key question is what metadata is required to
compose non-trivial queries, as opposed to discovery/planning via the
registry, where only very limited information is required, and whether these
are the same or distinct. I just would hate to see TAP crippled by an
approach which can't easily grow to support more sophisticated applications,
and efficient execution of complex queries against large tables.
- Doug
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