Managing Databases with Oracle
To obtain the structure of an Oracle table, the command to use is:

DESCRIBE [TableName].
DESC TABLE [TableName].
STRUCTURE [TableName].
DESCRIBE STRUCTURE [TableName].

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

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.
Indexes are created to enforce uniqueness on columns.
Indexes are created with the ALTER TABLE command.

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