Re: Update not behaving as hoped

From: Jack van Zanen <jack_at_vanzanen.com>
Date: Wed, 3 Nov 2010 13:35:06 +1100
Message-ID: <AANLkTi=FXfFaRvw388EFt-DUaq8f5dX50cww2uXbf5AM_at_mail.gmail.com>

try running the subselect on it's own

table2 has NO column named code.

Jack van Zanen

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On Wed, Nov 3, 2010 at 12:49 PM, Mindaugas Navickas <mnavickas_at_yahoo.com>wrote:

> Jack,
>
> I might not be as "smart" as Oracle and SQL servers together, but I can not
> see that syntax error as you see it. To it looks "normal" that sub-select
> has some columns from outer statement - for example - would you consider
> this update "normal":
>
>
> update table1
> set Org=0
> where exists (select 1 from table2 where code=per_code);
>
>
>
> As well as this (which would be equivelent to one that you have send)
>
>
> update table1
> set Org=0
> where exists (select 1 from table2 where code=code);
>
>
> Regards
> Mike Navickas
> Oracle&DB2 DBA
>
>
>
> ------------------------------
> *From:* Jack van Zanen <jack_at_vanzanen.com>
> *To:* oracle-l_at_freelists.org
> *Sent:* Tue, November 2, 2010 9:10:40 PM
> *Subject:* Update not behaving as hoped
>
> Hi All,
>
>
> Oracle 11 / Sql Server (same behaviour)
>
> My wife encountered following issue on sql server and asked me to check if
> oracle was "smarter". It seems to not be.
>
>
> Test case:
>
>
>
> create
> table table1
> (code int,Org int,Descr varchar(20));
>
> create
> table table2
> (per_code int,Name varchar(20));
>
> insert
> into table1 values (1,100,'Rec1');
>
> insert
> into table1 values (2,200,'Rec2');
>
> insert
> into table1 values (3,300,'Rec3');
>
> insert
> into table2 values (1,'TestRec1');
>
> insert
> into table2 values (2,'TestRec2');
>
> update
> table1
> set Org=0
> where code in (select code from table2); --There is a syntax error
> "invalid identifier" in the subselect but there is no error when running
> this update.
>
> select
> * from table1; --Not only was there no error but it updated the entire
> table.
>
>
> This is probably "normal" behaviour since both oracle and sql server do it
> but I would have hoped that a syntax error would result in an error no
> matter where it happens. Can anybody explain the technical reason why this
> would be happening.
>
> Jack
>

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Received on Tue Nov 02 2010 - 21:35:06 CDT