From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | "Josh Berkus" <josh(at)agliodbs(dot)com> |
Cc: | Matt Clark <mclark(at)rushe(dot)aero(dot)org>, pgsql-novice(at)postgresql(dot)org |
Subject: | Re: Use of nextval, currval |
Date: | 2002-11-08 07:29:23 |
Message-ID: | 3343.1036740563@sss.pgh.pa.us |
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Lists: | pgsql-novice |
"Josh Berkus" <josh(at)agliodbs(dot)com> writes:
>> I believe that I can replace this in Postgres with:
>>
>> insert into TABLE (id1,.......,id2)
>> values (nextval('DataId'),.....,currval('DataId');
>>
>> What I think is expected is that the values of id1 and id2 will be
>> equal.
> This is correct.
Well ... it's relying on the assumption that the elements of the VALUES
list will be evaluated left-to-right. Which is true at the moment,
and I don't really expect it to change, but it still could be called an
unsafe dependency on undocumented implementation details. I doubt you
will find anything in the SQL spec that requires implementations to
behave that way.
regards, tom lane
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