Re: grouping/clustering query

Your script is handy, Steve.

Spontaneously, This seems to be an array type problem, something I just have
vague notions about.

I'll take a look at this,
http://www.postgresql.org/docs/8.3/static/arrays.html to see if something
occurs...

Best,
Oliveiros

----- Original Message -----
From: "Steve Midgley" <science(at)misuse(dot)org>
To: "Joe" <dev(at)freedomcircle(dot)net>
Cc: <pgsql-sql(at)postgresql(dot)org>; "David Garamond" <davidgaramond(at)gmail(dot)com>
Sent: Friday, October 24, 2008 4:04 PM
Subject: Re: [SQL] grouping/clustering query

> At 11:28 AM 10/23/2008, Joe wrote:
>>Steve Midgley wrote:
>>>># (invoiceid, txid)
>>>>(A, 1)
>>>>(A, 3)
>>>>(B, 1)
>>>>(B, 2)
>>>>(C, 5)
>>>>(D, 6)
>>>>(D, 7)
>>>>(E, 8)
>>>>(F, 8)
>>>>
>>>>For journalling, I need to group/cluster this together. Is there a SQL
>>>>query that can generate this output:
>>>>
>>>># (journal: invoiceids, txids)
>>>>[A,B] , [1,2,3]
>>>>[C], [5]
>>>>[D], [6,7]
>>>>[E,F], [8]
>>>
>>>Hi Dave,
>>>
>>>I'm not following the logic here. A has 1,3 and B has 1,2. So why does
>>>the first line print:
>>>
>>>>[A,B] , [1,2,3]
>>>
>>>What's the rule that tells the query to output this way? Is it that all
>>>of B's values are between A's values?
>>
>> From a purely accounting standpoint, since transaction 1 was applied to
>> both invoices A and B, you need to group the invoices so that you can
>> compare total invoiced against total paid.
>
> I tinkered around briefly but didn't come up with a good idea, but I bet
> someone on this list can. However, I did create a CREATE script for your
> table design which, in my experience, makes it more likely that a real
> expert will take on your problem..
>
> Hope this helps,
>
> Steve
>
> DROP TABLE IF EXISTS trans;
>
> CREATE TABLE trans
> (
> id serial NOT NULL,
> inv_id character varying,
> tx_id character varying,
> CONSTRAINT pk_id PRIMARY KEY (id)
> )
> WITH (OIDS=FALSE);
>
> insert into trans (inv_id, tx_id) values('A','1');
> insert into trans (inv_id, tx_id) values('A','3');
> insert into trans (inv_id, tx_id) values('B','1');
> insert into trans (inv_id, tx_id) values('B','2');
> insert into trans (inv_id, tx_id) values('C','5');
> insert into trans (inv_id, tx_id) values('D','6');
> insert into trans (inv_id, tx_id) values('D','7');
> insert into trans (inv_id, tx_id) values('E','8');
> insert into trans (inv_id, tx_id) values('F','8');
>
>
>
>
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