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trouble with unique constraint

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The following SQL leads to a unique constraint violation error message (PostgreSQL 8.4.1).

 

 

create table test (val integer);

 

create unique index test_uni on test(val);

 

insert into test (val) values (1);

insert into test (val) values (2);

insert into test (val) values (3);

 

update test set val = val + 1;

 

 

But it works fine with Oracle, MSSQL and DB2. Any idea how to make it working with PostgreSQL as well?

 

 

 

 


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