【2020年8月】OCP 071考试新题(-2题)CUUG内部题库
Choose two.
Which two are true about unused columns?
A) You can query the data dictionary to see the names of unused columns.
B) CASCADE CONSTRAINTS must be specified when setting a column to unused if that column is referenced in a constraint on another column.
C) Setting an indexed column to unused results in an error.
D) If you set all the columns of a table to unused, the table is automatically dropped.
E) You can specify multiple column names in an ALTER TABLE... SET UNUSED statement.
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