（185）User SCOTT executes the following command on the EMP table but has not issued COMMIT, ROLLBACK, or any data definition language (DDL) command:

SQL> SELECT ename FROM emp

2 WHERE job='CLERK' FOR UPDATE OF empno;

SCOTT has opened another session to work with the database instance.

Which three operations would wait when issued in SCOTT's second session? (Choose three.)

A. LOCK TABLE emp IN SHARE MODE;

B. LOCK TABLE emp IN EXCLUSIVE MODE;

C. UPDATE emp SET sal=sal*1.2 WHERE job=MANAGER;

D. INSERT INTO emp(empno,ename) VALUES (1289,'Harry');

E. SELECT ename FROM emp WHERE job='CLERK' FOR UPDATE OF empno;

答案：（A、B、E）