cannot DROP or SET UNUSED a column that has been set unused

Solution ID:ORA-12999

Type: Oracle

Cause

An attempt was made to DROP or SET UNUSED a column that has already been 'set unused'.

Actions

Use the DROP UNUSED COLUMNS option to remove the column.

Try the following links for this error:


http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm


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