Add a primary key to table.

Hello everybody,
I want to add a primary key to a table but it doesn't work.
select count(*), count(id) from tableA;
COUNT(*) COUNT(ID)
830447 830447
You see: The number of ids is equal to the number of rows. The ID is not marked as unique but it should be unique. I try to set id as the primary key:
alter table tableA add constraint "pk_constraint" PRIMARY KEY (id);
But I a get an error message: ORA-02437: cannot validate (pk_constraint) - primary key violated.
What is the problem?
I use Oracle 11g.

user9206958 wrote:
Hello everybody,
I want to add a primary key to a table but it doesn't work.
select count(*), count(id) from tableA;
COUNT(*) COUNT(ID)
830447 830447
You see: The number of ids is equal to the number of rows. The ID is not marked as unique but it should be unique. I try to set id as the primary key:
alter table tableA add constraint "pk_constraint" PRIMARY KEY (id);
But I a get an error message: ORA-02437: cannot validate (pk_constraint) - primary key violated.
What is the problem?
I use Oracle 11g.Revisit your query... 11g can help much in this sql.... select count(*), count(id) from tableA;... to get what your desired output should be.
Edited by: Z.K. on Mar 30, 2010 1:15 PM

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4 /
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[http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm|http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm]
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hi
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He wants to be able to get down to a single row returnedWhat is a reason for that? What will change if he will see that same worker had multiple interactions for a case for one day?
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Joe Doe SC12345 2013-02-07 4Edited by: Mark Malakanov (user11181920) on Feb 7, 2013 12:22 PM
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and TRUNC(i.Timestamp)=TO_DATE('2013-02-07');Edited by: Mark Malakanov (user11181920) on Feb 7, 2013 12:22 PM
Edited by: Mark Malakanov (user11181920) on Feb 7, 2013 12:35 PM

Add a primary key to table.

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