Re: [GENERAL] Re: sql question

Ed Loehr wrote:

>
> >
> > Create temp table tempGroup(adrGroup_id integer, groupcounter integer);
> > INSERT INTO tempGroup
> > SELECT adrGroup_Id, count(*) FROM adrGroup GROUP BY 1 HAVING COUNT(*) = 1);
> > SELECT * from adrGroup, tempGroup
> >  WHERE adrGroup.adrGroup_id = tempGroup.adrGroup_id
> >    AND adrGroup.group_id = 7;
> >
> > This is working but without the desired performance :-(
> >
>
> I meant to use Address_Id where I used adrGroup_id.  Sorry 'bout that.  Try this, it seems to work:
>
> SELECT *
> FROM AddressGroup ag1
> WHERE NOT EXISTS (
>         SELECT *
>         FROM AddressGroup ag2
>         WHERE ag1.Address_Id = ag2.Address_Id AND
>               ag1.Group_Id <> ag2.Group_Id);
>
> A working demonstration is below.
>
> Cheers,
> Ed
>
> mydb=> create sequence adrverw_id_seq;
> CREATE
> mydb=> create table AddressGroup
> mydb-> (
> mydb->         AdrGroup_Id INTEGER NOT NULL DEFAULT NEXTVAL('adrverw_id_seq'),
> mydb->         Zeit        DATETIME NOT NULL,
> mydb->         Group_Id    INTEGER NOT NULL,
> mydb->         Address_Id  INTEGER NOT NULL
> mydb-> );
> CREATE
> mydb=> insert into AddressGroup(Zeit,Group_Id,Address_Id) values ('now',5,1);
> NOTICE:  adrverw_id_seq.nextval: sequence was re-created
> NOTICE:  adrverw_id_seq.nextval: sequence was re-created
> INSERT 3669904 1
> mydb=> insert into AddressGroup(Zeit,Group_Id,Address_Id) values ('now',6,1);
> INSERT 3669905 1
> mydb=> insert into AddressGroup(Zeit,Group_Id,Address_Id) values ('now',6,2);
> INSERT 3669906 1
> mydb=> insert into AddressGroup(Zeit,Group_Id,Address_Id) values ('now',6,3);
> INSERT 3669907 1
> mydb=> insert into AddressGroup(Zeit,Group_Id,Address_Id) values ('now',7,3);
> INSERT 3669908 1
> mydb=>
> mydb=> SELECT * FROM AddressGroup;
> adrgroup_id|zeit                        |group_id|address_id
> -----------+----------------------------+--------+----------
>           1|Thu Nov 18 18:10:50 1999 CST|       5|         1
>           2|Thu Nov 18 18:10:50 1999 CST|       6|         1
>           3|Thu Nov 18 18:10:50 1999 CST|       6|         2
>           4|Thu Nov 18 18:10:50 1999 CST|       6|         3
>           5|Thu Nov 18 18:10:50 1999 CST|       7|         3
> (5 rows)
>
> mydb=>
> mydb=> SELECT *
> mydb-> FROM AddressGroup ag1
> mydb-> WHERE NOT EXISTS (
> mydb->         SELECT *
> mydb->         FROM AddressGroup ag2
> mydb->         WHERE ag1.Address_Id = ag2.Address_Id AND
> mydb->               ag1.Group_Id <> ag2.Group_Id);
> adrgroup_id|zeit                        |group_id|address_id
> -----------+----------------------------+--------+----------
>           3|Thu Nov 18 18:10:50 1999 CST|       6|         2
> (1 row)

It is working ;-) Thanks

Herbie

--
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Herbert Liechti                            E-Mail: Herbert.Liechti@thinx.ch
ThinX networked business services               Stahlrain 10, CH-5200 Brugg
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