What's the performance (gain/loss) on such a join, when would you want to
use one?
Kev
-----Original Message-----
McDonald
Sent: Thursday, May 31, 2001 6:00 AM
To: Multiple recipients of list ORACLE-L
A method of joining two tables. You scan each and use
a hashing algorithm to isolate/match keys.
hth
connor
- Senthil Ganapathi
<senthil.ganapathi_at_mannai.com.qa> wrote: >
> Hi Rukmini
> could tell me what's that hash-join
>
> GSK
>
>
>
>
> "Rukmini
>
> Devi" To:
> Multiple recipients of list ORACLE-L
> <rukmini_at_indb
> <ORACLE-L_at_fatcity.com>
> rain.com> cc:
>
> Sent by: Subject:
> Re: 4 join methods?
> root_at_fatcity.
>
> com
>
>
>
>
>
> 31-05-01
>
> 09:55 AM
>
> Please
>
> respond to
>
> ORACLE-L
>
>
>
>
>
>
>
>
>
> 1. Equi-join 2. Self-join 3. Outer-join 4.
> Hash-join
>
> rukmini
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> Sent: Thursday, May 31, 2001 11:20 AM
>
>
> > i feel the fourth one is self join.
> >
> > ----- Original Message -----
> > To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> > Sent: Thursday, May 31, 2001 8:10 AM
> >
> >
> > > Hi,
> > >
> > > I just read there are four join methods. I know
> three:
> > >
> > > Nested loops
> > > Sort merge
> > > Hash join
> > >
> > > What's the fourth?
> > >
> > > - Greg
> > >
> > > --
> > > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
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> > > Author: Greg Moore
> > > INET: sqlgreg_at_pacbell.net
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> --
> Please see the official ORACLE-L FAQ:
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> Author: Rukmini Devi
> INET: rukmini_at_indbrain.com
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> Fat City Network Services -- (858) 538-5051 FAX:
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> --
> Please see the official ORACLE-L FAQ:
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> Author: Senthil Ganapathi
> INET: senthil.ganapathi_at_mannai.com.qa
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Received on Thu May 31 2001 - 09:09:06 CDT
