单选题CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT 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 o
题目
单选题
CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT 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.
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参考答案和解析
正确答案：
B
解析：
暂无解析