Re: [HACKERS] unfortunately...

> I don't like implementation of referential integrity constraints
> in contrib/spi/refint.* and implementation of ... unique indices:
> backend checks constraints when tuple is changed.
>
> Oracle checks constraints after entire _statement_ is done.
> Do you remember this:
>
> vac=> create table x (a int unique);
> NOTICE:  CREATE TABLE/UNIQUE will create implicit index x_a_key for table x
> CREATE
> vac=> insert into x values (1);
> INSERT 143852 1
> vac=> insert into x values (2);
> INSERT 143853 1
> vac=> update x set a = a + 1;
> ERROR:  Cannot insert a duplicate key into a unique index
>
> This is simplest case. Keeping in mind triggers
> I would like to see Oracle behaviour some day and so
> I decided to do not implement FOREIGN keys in 6.4 -:((

OK.  Removed from open 6.4 items list.

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