From: Stefan Arentz <stefan.arentz@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Querying for name/value pairs in reverse
Date: Sat, 15 Jul 2006 11:24:17 +0200
Message-ID: <adf34c300607150224k7d4243f6ye52a21bf0a1bd0a6@mail.gmail.com> (raw)
I'm no SQL expert by any means so I'm wondering if something like this
is possible.
I have two tables like this:
create table Errors (
Id serial not null,
CreateDate timestamp not null,
primary key (Id)
);
create table ErrorValues (
Id serial not null,
ErrorId int not null,
Name varchar(255) not null,
Value text not null,
primary key (Id),
foreign key (ErrorId) references Errors (Id)
);
Now, selecting specific ErrorValues with a bunch of names that are
related to an Error is of course pretty simple. But I want to go the
other way. I want to query for:
'give me all Errors that have the Code=1234 AND Address=1.2.3.4 AND
Type=OSX Name/Value pairs'
What is a good recipe to deal with this? Is something like this
possible with standard sql? Is there a nice PG way to do this?
Are there good books that cover real world stuff like this?
So many questions from a SQL noob.
S.
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To: pgsql-sql@postgresql.org
Cc: stefan.arentz@gmail.com
Subject: Re: Querying for name/value pairs in reverse
In-Reply-To: <adf34c300607150224k7d4243f6ye52a21bf0a1bd0a6@mail.gmail.com>
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