Another great new feature oracle 12C is to have a table column as invisible columm.
Invisible column is not being fetched when generic query like
"select * from" is used.
Invisible column can only be queried by direct usage like
"select invcolumn from table.."
This feature is useful especially when the column is not in use then instead of drop it,use Invisible column, or for some security reasons for example password column etc.
Below is the example:
ALTER TABLE t_my_tab MODIFY (pwd invisible);
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