How to upgrade an ordered list with a constraint

Hi friends,


I need to update a column for all records in the table with a unique constraint

ex - select rec_no in tablename;
9
8
7
6
5

now I have to update this as
Select rec_no in tablename;
8
7
6
5
4
but when I do update tablename set rec_no = rec_no-1
I get unique constraint error



Please help me

DJ wrote:
but when I do update tablename set rec_no = rec_no-1
I get unique constraint error

No, you don't. Show us.

Oracle ensures consistency of 'duress of education. " If you perform an update statement (which is what you say above), then the Oracle will not give you a constraint error.

Because if she did, then we are all would have a serious problem: whether or not the update succeeds then depend on the order in which Oracle (ie. the implementation plan) happens to be updated lines. And we cannot have such behavior "undeterministic" (similar to what we would have if Oracle has not provided us with the error table mutation...).

Just so try, or show us:

create table uk_test
(i number not null unique)
/

insert into uk_test values(4);
insert into uk_test values(3);
insert into uk_test values(2);

commit;

Now try these two:

update (select * from uk_Test order by i desc) set i=i-1;

update (select * from uk_Test order by i) set i=i-1;

They both succeed. Oracle allows temporary constraint violations during at the execution of a statement inside. There is no need to define this constraint postponed here.

I'm talking about consistency of statement here also-level constraint:

http://rulegen.blogspot.nl/2012/01/statement-level-constraint-validation.html

Tags: Database

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