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Date: Thu, 03 Mar 2005 17:18:31 +0100
From: Benoit Hambucken <b.hambucken@immedia.be>
Organization: IMmedia
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To: Derby Discussion <derby-user@db.apache.org>
Subject: Re: using a join in UPDATE or DELETE command
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Maybe:

update keys set ky='xxx' where person in
(select person from badies where age<25);

delete from keys where person in
(select person from badies where age<25);

Benoit Hambucken

derby@os10000.net wrote:
> Hello,
> 
> I have asked the same question in the IBM Cloudscape forum, but with a
> different wording.  Perhaps one of you can provide a definitive answer.
> 
> I wish to do the following
> 
> create table keys ( person varchar(10), ky varchar(10) );
> insert into keys values ( 'alice', '9876' );
> insert into keys values ( 'bob', '54321' );
> insert into keys values ( 'charlie', '121212' );
> insert into keys values ( 'douglas', '343434' );
> 
> create table badies ( person varchar(10), age int );
> insert into badies values ( 'charlie', 20 );
> insert into badies values ( 'douglas', 30 );
> 
> update keys set ky='xxx' where person=badies.person and badies.age<25;
> 
> ERROR 42X04: Column 'BADIES.PERSON' is not in any table in the FROM list
> or it appears within a join specification and is outside the scope of
> the join specification or it appears in a HAVING clause and is not in
> the GROUP BY list.  If this is a CREATE or ALTER TABLE statement then
> 'BADIES.PERSON' is not a column in the target table.
> ERROR 42X04: Column 'BADIES.PERSON' is not in any table in the FROM list
> or it appears within a join specification and is outside the scope of
> the join specification or it appears in a HAVING clause and is not in
> the GROUP BY list.  If this is a CREATE or ALTER TABLE statement then
> 'BADIES.PERSON' is not a column in the target table.
> delete from keys where person=badies.person and badies.age>=25;
> 
> Do you have any suggestions on how I should construct the update and
> delete commands to achieve what I aim for?
> 
> I am currently using a very tedious method with a temporary table, into
> which I insert carefully crafted fragments that do not include the data
> I would simply delete from an existing table.  This is possible, since
> the INSERT command does support joins in its select clause.
> 
> Thanks so much,
> 
> Oliver Seidel
> 
> 
> 
> 
>