The DUAL table is a little like an internal Oracle database cursor.

Name: The DUAL table is a little like an internal Oracle database cursor.
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The DUAL table is a special table in Oracle that is automatically created and used to select a single row with a single column of values. It is often used as a quick and easy way to test SQL statements or to select and display literal values. While it can be thought of as similar to a cursor, it is not actually a cursor in the technical sense.

The DUAL Table Is a Little Like an Internal Oracle