From: "Gábor Boskovits" <boskovits@gmail.com>
To: "Clément Lassieur" <clement@lassieur.org>
Cc: Guix-devel <guix-devel@gnu.org>,
Tatiana Sholokhova <tanja201396@gmail.com>
Subject: Re: GSoC: Adding a web interface similar to the Hydra web interface
Date: Sun, 29 Jul 2018 15:25:42 +0200 [thread overview]
Message-ID: <CAE4v=pjmEO=Lbw3AohjTPdz1cK=YFGu-m9EbuFXqRU86V0mPEA@mail.gmail.com> (raw)
In-Reply-To: <87tvoib69u.fsf@lassieur.org>
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P
Clément Lassieur <clement@lassieur.org> ezt írta (időpont: 2018. júl. 29.,
V 14:01):
> Danny Milosavljevic <dannym@scratchpost.org> writes:
>
> > Hi Tatiana,
> >
> > On Sun, 8 Jul 2018 21:48:32 +0200
> > Tatiana Sholokhova <tanja201396@gmail.com> wrote:
> >
> >> Do you have ideas on how to
> >> implement tuple comparison and other routines in SQL and guile in a
> >> convenient and flexible way?
> >
> > sqlite3 supports row values, so the comparison can be
> > written like this:
> >
> > select * from foo where (a,b,c) = (2,'foo',3);
> >
> > It even supports NULLs for wildcards, though it's a little more
> complicated:
> >
> > select * from foo where coalesce((a,b,c) = (2,NULL,3), 1) = 1;
> >
> > The sqlite C interface doesn't support parameter bindings for the entire
> > row, though, so you'd have to specify 3 values.
> >
> > This works:
> >
> > (sqlite-exec db "select * from foo where (a,b,c) = (" 2 "," "foo" ","
> 3 ");")
> >
> > but this doesn't work, unfortunately:
> >
> > (sqlite-exec db "select * from foo where (a,b,c) = " '(2 "foo" 3) ";")
> >
> > See also https://www.sqlite.org/rowvalue.html
>
> With the '<' operator, it doesn't give the results we are looking for, I
> think.
>
> For example:
>
> select (0,1) < (1,0); -- returns 1
> select (0,0) < (0,1); -- returns 1
>
This is working as expected. Actually this:
(a,b)<(c,d) is a shortcut for a<c or (a=c and b<d).
In both cases, we'd want it to return 0.
>
How do we use it? Why this is the expected result?
> I think we should use:
>
> select (0 < 1) and (1 < 0); -- returns 0
> select (0 < 0) and (0 < 1); -- returns 0
>
Could you please clarify which numbers are the placeholders for which
quantities?
>
> instead, for the pagination borders code.
>
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next prev parent reply other threads:[~2018-07-29 13:25 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-03 15:44 GSoC: Adding a web interface similar to the Hydra web interface Tatiana Sholokhova
2018-05-04 2:01 ` Maxim Cournoyer
2018-05-04 12:55 ` Ludovic Courtès
2018-05-05 10:50 ` Ricardo Wurmus
2018-05-08 7:26 ` Danny Milosavljevic
2018-05-09 9:56 ` Ricardo Wurmus
2018-05-09 17:21 ` Ricardo Wurmus
2018-05-13 18:45 ` Tatiana Sholokhova
2018-05-13 19:30 ` Gábor Boskovits
2018-05-13 19:33 ` Tonton
2018-05-13 19:54 ` Danny Milosavljevic
2018-05-14 3:34 ` Chris Marusich
2018-05-14 4:20 ` Ricardo Wurmus
2018-05-17 22:31 ` Tatiana Sholokhova
2018-05-18 20:35 ` Ricardo Wurmus
2018-05-21 21:52 ` Tatiana Sholokhova
2018-05-22 5:33 ` Ricardo Wurmus
2018-05-23 21:06 ` Tatiana Sholokhova
2018-05-24 6:03 ` Ricardo Wurmus
[not found] ` <CAMSS15DThnLO+YEVaBmJ9ozMeu4mO1rHAdXHgZ8K+Csu40pORQ@mail.gmail.com>
2018-05-28 10:39 ` Ricardo Wurmus
2018-06-02 15:03 ` Ricardo Wurmus
2018-06-03 15:50 ` Tatiana Sholokhova
2018-06-03 19:40 ` Ricardo Wurmus
2018-06-04 22:14 ` Tatiana Sholokhova
2018-06-05 20:40 ` Ricardo Wurmus
2018-06-06 18:02 ` Danny Milosavljevic
2018-06-10 14:36 ` Tatiana Sholokhova
2018-06-11 10:19 ` Ricardo Wurmus
2018-06-11 11:23 ` Ludovic Courtès
2018-06-12 16:35 ` Danny Milosavljevic
2018-06-12 21:52 ` Ricardo Wurmus
2018-06-12 22:43 ` Tatiana Sholokhova
2018-06-13 6:39 ` Gábor Boskovits
2018-06-13 8:27 ` Danny Milosavljevic
2018-06-13 13:58 ` Joshua Branson
2018-06-13 14:22 ` Gábor Boskovits
2018-06-13 15:07 ` Joshua Branson
2018-06-25 10:46 ` Gábor Boskovits
2018-06-25 12:12 ` Tatiana Sholokhova
2018-06-27 19:56 ` Ludovic Courtès
2018-07-04 20:54 ` Tatiana Sholokhova
2018-07-04 21:47 ` Jelle Licht
2018-07-05 8:27 ` Danny Milosavljevic
2018-07-06 9:58 ` Gábor Boskovits
2018-07-08 19:48 ` Tatiana Sholokhova
2018-07-08 21:09 ` Danny Milosavljevic
2018-07-29 12:01 ` Clément Lassieur
2018-07-29 13:25 ` Gábor Boskovits [this message]
2018-07-29 14:41 ` Clément Lassieur
2018-07-08 21:19 ` Gábor Boskovits
2018-07-18 10:37 ` Clément Lassieur
2018-07-19 20:10 ` Tatiana Sholokhova
2018-07-19 21:47 ` Amirouche Boubekki
2018-07-18 10:19 ` Clément Lassieur
2018-07-17 19:31 ` Clément Lassieur
2018-05-29 16:07 ` Ludovic Courtès
2018-05-29 16:17 ` Gábor Boskovits
2018-07-18 9:34 ` Clément Lassieur
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