RE: Sql question

From: Arn Klammer <Arn.Klammer_at_austrac.gov.au>
Date: Tue, 12 Feb 2002 19:08:51 -0800
Message-ID: <F001.0040D83C.20020212190319@fatcity.com>

Remco is right: the last predicate in the subquery should be "=" instead of "<>" as we want to EXCLUDE those ones using the NOT EXISTS. In fact, I think that query will always return no rows, as the first part is asking for those with searchvalue = 'first one', but not those with no searchvalues that do not equal 'second one', which of course excludes 'first one'...

>>> Thomas.Mercadante_at_Labor.State.Ny.Us 13/2/2002 3:48:27 >>> This message has been scanned by MAILSweeper.

Remco,

This is exactly what he wants - all records where the first one exists and the second one does not exist.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
Sent: Tuesday, February 12, 2002 10:23 AM To: Multiple recipients of list ORACLE-L

Thomas,

"NOT EXISTS" and "<>" equals "must be at least one"

Right ?

That's not what Zsolt wants ... :-)

-----Oorspronkelijk bericht-----
Van: Mercadante, Thomas F [mailto:Thomas.Mercadante_at_Labor.State.Ny.Us] Verzonden: dinsdag 12 februari 2002 14:28 Aan: Multiple recipients of list ORACLE-L Onderwerp: RE: Sql question

Zsolt,

Try:

select a.something
,c.searchvalue

from a,

        b,
        c
  where a.a= b.a
        and b.b1= c.b1
        and b.b2= c.b2
        and c.searchvalue= 'first one' and
        and not exists(select 1 from c c1
                         where c1.b1 = c.b1
                         and   c1.b2 = c.b2
                         and   c1.searchvalue<> 'second one')

the above presumes that the columns b1 and b2 are part of the identifying
columns for the c table.

hope this helps.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
Sent: Monday, February 11, 2002 4:40 PM
To: Multiple recipients of list ORACLE-L

Hi,

I have the following sql:

select a.something
,c.searchvalue

from a,

        b,
        c

where a.a= b.a

        and b.b1= c.b1
        and b.b2= c.b2

        and c.searchvalue= 'first one' and
        c.searchvalue<> 'second one'

The problem is that if a company has a record with c.searchvalue= 'first
one' then the
query above list it although it has another record with c.searchvalue= 'second one'

To be more precise : I need to get the companies that have searchvalue =

'first one' but I don't want
to see companies that has 'second one'. (the main problem is with companies
that have both values)

Thank you

Zsolt Csillag,
Hungary

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Author: Csillag Zsolt
INET: starsoft_at_interware.hu

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Author: Mercadante, Thomas F
INET: Thomas.Mercadante_at_Labor.State.Ny.Us

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Author: Arn Klammer
  INET: Arn.Klammer_at_austrac.gov.au

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Received on Tue Feb 12 2002 - 21:08:51 CST