于 2013-09-09 20:54, Peter Eisentraut 回复:
> On 9/3/13 3:13 AM, wangshuo@highgo.com.cn wrote:
>> Drop/build and disable/enable constraint has no fundamental
>> difference,
>> and could achieve the same purpose.What I do also more convenient
>> for
>> the user.
>> Recording the disabled constraints is easier than recoding all the
>> constrains.
>
Peter Eisentraut wrote:
> Note that other schema objects can depend on the existence of
> constraints. For example, the validity of a view might depend on the
> existence of a primary key constraint. What would you do with the
> view
> if the primary key constraint is temporarily disabled?
>
Thanks for your reply. I could't clearly understand your opinion, could you give me more
information or example？
>> What's more, a lot of people ever asked about turing off constraint
>> and
>> The sql2008 support this.So I think it's necessary in some ways.
>
> I don't see this in the SQL standard. There is [NOT] ENFORCED, but
> that's something different. Implementing that instead might actually
> address the above concern.
You are right. I had checked the SQL standard. There is not
ENABLE/DISABLE.
Sorry.
I misunderstood the former discussion about the constraint and the SQL
standard.
Thanks ,again.
Wang Shuo HighGo Software Co.,Ltd. September 11, 2013