Re: is there a way to deliver an array over column from a query window?

[Rafał Pietrak <rafal@xxxxxxxxxxxxxxxxxx>]

W dniu 03/24/2013 12:06 PM, Misa Simic pisze:

maybe,

SELECT DISTINCT issuer,amount, array_agg(REFERENCE) over (partition by invoice_nr) from invoices;

RIGHT. Thenx. (and the first thing I did, I've read the doc on array_agg().... what stress makes from people :(

thenx again,


-R

2013/3/24 Rafał Pietrak <rafal@xxxxxxxxxxxxxxxxxx>

Hi,

I really don't know how to ask for what I'm looking for; but I think, may be, calling it an ARRAY yielding aggregate function for use within a query WINDOW would do?

I'm looking for something like:

SELECT DISTINCT issuer,amount, array(REFERENCE) over (partition by invoice_nr) from invoices;

where the invoices table contain the usual invoice data, like:
- amount
- time of issue
- the issuer ID
- and the above REFERENCE, is the reference to a bank transfer record in another table.

The thing is, that I have multiple funds transfer records referring to a single invoice; and (I currently think, that :) I need  to fetch them all in a single column - so preferrably within an ARRAY of references (or just transfer IDs) to table containing funds transfer records. In other words, I wouldn't like to collapse the query at the application level ... but "if everything else fails", that is the last resort I keep in mind.

The reason I'm not taking the last resort now, is that I also have multiple invoices to a single funds transfer record. And ultimately I'm hoping to cook a query, that would window-and-balance the two tables (invoices, and funds transfer) - so that most of the job is done by SQL/funciton/view, not by the external application.

I've looked up postgres documentation, looking for a sort of "aggregate" function, that would not compute anything, but just build an ARRAY from all its input, but couldn't locate any.

Is there a way to achieve this in postgresql?

-R


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