试题详情
- 多项选择题 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 wouldwait when issued in SCOTT’s second session()
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;
- A,B,E
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