Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT What is true about the set?

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  1. The DESCRIBE DEPT statement displays the structure of the DEPT table.

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

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

  4. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement

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Correct Option: A

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) The DESCRIBE DEPT statement displays the structure of the DEPT table. This option is correct. The DESCRIBE statement in SQL is used to display the structure of a table. In this case, the DESCRIBE DEPT statement will display the structure of the DEPT table.

Option B) The ROLLBACK statement frees the storage space occupied by the DEPT table. This option is incorrect. The ROLLBACK statement in SQL is used to undo the changes made in the current transaction. It does not directly free the storage space occupied by a table.

Option C) The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist. This option is incorrect. Since the CREATE TABLE dept statement is executed before the DESCRIBE DEPT statement, the DEPT table does exist. Therefore, the DESCRIBE DEPT statement will not return an error.

Option D) The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement. This option is incorrect. The DESCRIBE statement can be used to display the structure of a table regardless of whether a COMMIT statement has been executed or not.

The correct answer is A. The DESCRIBE DEPT statement displays the structure of the DEPT table.

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