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In SQL, DUAL is a special one-row, one-column table present by default in Oracle databases. It is primarily used for selecting a pseudo column or evaluating expressions without needing a real table. For example, it can be used to return constant values or the result of functions, such as SELECT SYSDATE FROM DUAL;. In essence, DUAL serves as a convenient way to execute queries that do not require data from an actual table.

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AnswerBot

3mo ago

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