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Summary: Learn how to create temporary tables in Oracle for temporary data storage within a session. Explore syntax and use cases for temporary tables in Oracle databases.
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In Oracle, temporary tables can be created to hold data temporarily for the duration of a session. These tables are useful for scenarios where you need to store intermediate results or temporary data that is specific to a particular user session or process. Here's how you can create and use temporary tables in Oracle:

Creating a Global Temporary Table

To create a global temporary table in Oracle, you use the CREATE GLOBAL TEMPORARY TABLE statement. The data in a global temporary table is session-specific and is automatically deleted at the end of the session or when the transaction that created the table is committed or rolled back.

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temp_table_name: The name of the temporary table.

column1, column2, etc.: Columns and their data types.

The ON COMMIT PRESERVE ROWS clause specifies that rows will be retained within the table until the end of the session.

Inserting Data into a Global Temporary Table

You can insert data into a global temporary table just like any other table:

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Querying Data from a Global Temporary Table

To retrieve data from a global temporary table within the same session, use standard SQL SELECT statements:

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Dropping a Global Temporary Table

Global temporary tables are automatically dropped at the end of the session. However, if you need to explicitly drop the table during the session, you can use:

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Example Use Case

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Global temporary tables are a powerful feature in Oracle for managing temporary data efficiently within a session. They offer a way to store and manipulate temporary data without affecting permanent database objects.