Hidden Column "SYS_NC000XX$" Being Added When A New Column Is Added To The Table.

(Doc ID 2277937.1)

Last updated on JUNE 18, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.1 and later
Information in this document applies to any platform.

Symptoms

We found one hidden column (Format SYS_NC000XX$) being added to the table whenever we add a new column to the table with Default Value clause.

ALTER TABLE ORACLE.TEST ADD ( TEST_COL NUMBER(10) DEFAULT 0 NULL);

 

Cause

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