单选题Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCHAR2(14), loc VARCHAR2(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 s
题目
单选题
Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCHAR2(14), loc VARCHAR2(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 occupied 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.