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单选题
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?()
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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更多 “单选题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?()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.” 相关考题
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考题 CREATE TABLE dept(deptno NUMBER(2),dname VARCNAR2(14),1oc VARCNAR2 (13));ROLLBACK;DESCRIBE DEPTWhat 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.

考题 Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table? () A. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) NOT NULL CONSTRAINT emp_deptno_fk FOREIGN KEY deptno REFERENCES dept deptno);B. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) CONSTRAINT emp_deptno_fk REFERENCES dept (deptno));C. CREATE TABLE EMP (empno NUMBER(4) ename VARCHAR2(35), deptno NUMBER(7,2) NOT NULL, CONSTRAINT emp_deptno_fk REFERENCES dept (deptno) FOREIGN KEY (deptno));D. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) FOREIGN KEY CONSTRAINT emp deptno fk REFERENCES dept (deptno));

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考题 Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?()A、SELECT UNIQUE dept FROM staffB、SELECT DISTINCT dept FROM staffC、SELECT (dept) UNIQUE FROM staffD、SELECT (dept) DISTINCT FROM staff

考题 下面哪一个SQL语句将删除DEPT表中的所有数据,并永久删除DEPT表的整个结构()A、DROP TABLE dept;B、DELETE TABLE dept;C、TRUNCATE TABLE dept;D、DELETE * . * FROM dept; [END CODE]"

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考题 多选题Evaluate the SQL statement DROP TABLE DEPT: Which four statements are true of the SQL statement? ()AYou cannot roll back this statement.BAll pending transactions are committed.CAll views based on the DEPT table are deleted.DAll indexes based on the DEPT table are dropped.EAll data in the table is deleted, and the table structure is also deleted.FAll data in the table is deleted, but the structure of the table is retained.GAll synonyms based on the DEPT table are deleted.

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