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单项选择题 Evaluate the set of SQL statements: What is true about the set?（）

A、The DESCRIBE DEPT statement displays the structure of the DEPT table.

B、The ROLLBACK statement frees the storage space occupies by the DEPT table.

C、The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.

D、The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

  • A

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