Managing Databases with Oracle
After a table has been created, its structure can be modified using the SQL command:

MODIFY TABLE [TableName].
UPDATE TABLE [TableName].
CHANGE TABLE [TableName].
ALTER TABLE [TableName].

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

You can add a column at any time as long as it is a NULL column.
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 cannot increase or decrease the number of decimal places.

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