Default value for column cannot be changed to NULL
Last updated on DECEMBER 06, 2016
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 and later
Information in this document applies to any platform.
When using fast add method to add a column with a default value, as per the following:-
and after dropping the NOT NULL constraint , If you tried to change or remove the default value by setting it to NULL , it will still use the old one.
Here is an example of the situation:-
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