Re: [Pytables-users] Help on sorting tables

[Ümit S. <uem...@gm...>]

I completely forgot about the CSI index. That's of course much easier than
what I suggested ;-)
Am 22.03.2012 17:39 schrieb "Francesc Alted" <fa...@gm...>:

> On 3/22/12 11:02 AM, sreeaurovindh viswanathan wrote:
> > Hi,
> >
> > If I have three columns in a table and if i wish to sort based on one
> > field and then on the other what would be the recommended method.I
> > would be sorting atleast 75,00,000 records at a time.
> >
> > ie I would like to use something equivalent the following sql query.
> >
> > Select * from sample.table order by query desc,keyword asc.
> Provided that you have created a CSI index on this field, there are a
> couple of ways for doing this:
>
> 1) Table.itersorted(): retrieves the table records in sorted order
>
> 2) Table.readSorted(): retrieves the complete sorted table as a
> monolithic structured array
>
> Both methods follow ascending order by default.  Choose a step=-1 for
> choosing a descending order.
>
> -- Francesc Alted
>
>
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