From: Rob Sargent <robjsargent@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: Can i force deletion of dependent rows?
Date: Mon, 15 Feb 2010 12:04:30 -0700
Message-ID: <4B799ABE.9040701@gmail.com> (raw)
In-Reply-To: <m3fx55linc.fsf@passepartout.tim-landscheidt.de>
References: <6caee9521002120424l27ec8d3eq3b69522d0a773686@mail.gmail.com>
<6caee9521002122211q7e4fd2fcj1a0489fd64dc204a@mail.gmail.com>
<m3fx55linc.fsf@passepartout.tim-landscheidt.de>
then I think OP needs to delete A where "your x";
On 02/13/2010 12:05 AM, Tim Landscheidt wrote:
> Shruthi A<shruthi.iisc@gmail.com> wrote:
>
>> I have 2 tables (A and B) where the table B has a foreign key reference to
>> table A. Like this:
>
>> create table A (x int primary key);
>> create table B (y int primary key, z int references A (x) );
>
>> As you can see, i've not specified any further 'on delete' clause to the
>> foreign key constraint like 'on delete cascade' or 'on delete restrict' or
>> 'on delete set null' or 'on delete set default'. This means that the
>> default behavior is followed ie 'on delete restrict' holds by default.
>
>> Now I want to delete a particular row from table A. Is there any way I can
>> force deletion of all the dependent rows in table B?
>
>> Note that the tables have already been created in the above manner and
>> populated. I want to do this deletion through DML only ie without any
>> change in the table definition.
>
> "DELETE FROM B WHERE z = 'your x';"?
>
> Tim
>
>
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Subject: Re: Can i force deletion of dependent rows?
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