Re: unique key problem on update

Gary Stainburn wrote on 20.09.2013 18:30:
>> You need to define the primary key as deferrable:
>>
>> create table skills_pages
>> (
>> sp_id serial not null,
>> sp_sequence integer not null,
>> sp_title character varying(80),
>> sp_narative text,
>> primary key (sp_id) deferrable
>> );
>
> Cheers. I'll look at that. It's actually the second unique index that's the
> problem but I'm guessing I can set that index up as deferrable too.

Ah, sorry didn't see that ;) but, yes it works the same way:

create table skills_pages
(
sp_id serial not null,
sp_sequence integer not null,
sp_title character varying(80),
sp_narative text,
primary key (sp_id),
unique (sp_sequence) deferrable
);

> Hopefully it'll work for mysql too.
No, it won't.

MySQL neither has deferrable constraints nor does it evaluate them on statement level (they are *always* evaluated row-by-row).