1z0-071 Exam Dumps | Which three actions can you perform on an existing table containing date?

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Question 125/139

Which three actions can you perform on an existing table containing date?

A. Add a new column as the table's first column.

B. Define a default value that is automatically inserted into a column containing nulls.

C. Add a new NOT NULL Column with a DEFAULT value.

D. Change a DATE Column containing data to a NUMBER data type.

E. Increase the width of a numeric column.

F. Change the default value of a column.

Correct Answer: C,E,F

C: True. You can add a new NOT NULL column to an existing table, provided you specify a DEFAULT value for the column. This ensures that existing rows in the table can be updated with a default value, thus maintaining the NOT NULL constraint integrity.
E: True. It is permissible to increase the width of a numeric column, provided the change does not truncate existing data. This change is generally safe as it allows for greater values or more precision without affecting existing data.
F: True. The default value of a column can be changed. This action affects subsequent insert operations but does not alter the values of existing rows. Changing the default is useful for adapting tables to evolving business rules without impacting existing data.

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