Managing Databases with Oracle
Which of the following is not true about modifying table columns?

You cannot increase or decrease the number of decimal places.
You can increase the number of characters in character columns or the number of digits in numeric columns
You can drop a column at any time.
You can add a column at any time as long as it is a NULL column.

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Managing Databases with Oracle
Which of the following is not true about indexes?

Indexes are created to enable fast retrieval by column values.
Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.
Indexes are created with the ALTER TABLE command.
Indexes are created to enforce uniqueness on columns.

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