Oracle add-on primary key added [sequence]--table data already exists

Source: Internet
Author: User

--increase the primary key IDAlter TableClerk_compareAddId Number( -);--set sequence to make the ID self-incrementCreatesequence seq_id MinValue1MaxValue999999999Start with 1;--set the value of the ID to sequenceUpdateClerk_compareSetId=Seq_id.nextval;Commit;--set ID as primary keyAlter TableClerk_compareAdd constraintClerk_comparePrimary Key(ID);
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Add:

1: A sequence can be shared by multiple tables.

2: The number sequence generated by sequence shared by multiple tables is always continuous and does not start again.

3: If the sequence is no longer used, delete it.

Oracle add-on primary key added [sequence]--table data already exists

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