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

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

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

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

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