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ORA-01758 When Adding IDENTITY Column Creates Anyway A System Generated Sequence (Doc ID 1960560.1)

Last updated on AUGUST 23, 2021

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


On database version.

When attempting to add IDENTITY column to a table with data, the following error occurs and the sequence is created anyway.

ORA-01758: table must be empty to add mandatory (NOT NULL) column

Steps to reproduce:

The issue can be reproduced at will with the following steps:
1. create a table
2. populate the table with data
3. add the identity primary key column

Test Case:

Due to this issue, users cannot create an identity columns on existing tables with data in it.




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