All the database users are presently connected to the database instance and working. The HR user hasopened three database sessions and executed the following command in one of his sessions：SQL> UPDATE persons SET ccode=’U031’ WHERE ccode=’U029’； 123 rows

题目

All the database users are presently connected to the database instance and working. The HR user hasopened three database sessions and executed the following command in one of his sessions：SQL> UPDATE persons SET ccode=’U031’ WHERE ccode=’U029’； 123 rows updated.SQL> DELETE FROM persons WHERE exp=’Y’；3 rows deleted. The SYS user opens a new session after HR executed the above commands. Which sessions can see theeffect of the UPDATE and DELETE commands（）

A、All sessions of the HR user only
B、All sessions of the HR user and the SYS user
C、The session of the HR user that executed the commands
D、All the sessions for which the database users have access privilege to the PERSONS table

参考答案和解析

正确答案:C

如果没有搜索结果或未解决您的问题，请直接联系老师获取答案。

相似问题和答案

第1题：

有关ALL以下说法正确的是

A、免疫学分型将T细胞ALL分为4个亚型

B、免疫学分型将B细胞ALL分为3个亚型

C、仅10%ALL患者可检出克隆性核型异常相关性

D、除ALL L3型以外，ALL的免疫学亚型与FAB亚型之间无相关性

E、免疫学分型将ALL分为T细胞ALL、B细胞ALL和T、B细胞混合性ALL

参考答案：D

第2题：

[A] All in all [B] In addition [C] In case [D] After all

正确答案：D
28.D all in all总之；in addition除此之外，另外；in case以防；after all 毕竟。根据前文所述杰索普需要帮他承担风险的人，可推断此处应紧接着解释这个风险是什么，也就是“毕竟，他们还不确定黄金是否还在那里。”，故选D。

第3题：

我们从特供商场购买食品，并加强对所购食品的检查

A.We’ll buy all the food from supermarket and check all the food we buy carefully

B.We’ll buy all the food from foreign countries and check all the food we buy carefully

C.We’ll import all the food and check all the food we buy carefully

D.We’ll buy all the food from exclusive shops and check all the food we buy carefully

正确答案：D

第4题：

Barbara tried _______ in the door but _________ worked.

A、every of her keys; none

B、all of her keys; not every one

C、all of her keys; none

D、her all keys; not all

正确答案：C

第5题：

__________ specifies the feature of [+continuant] .

A、all the fricatives

B、all the fricatives and glides

C、all the fricatives and liquids

D、all the fricatives, liquids and glides

参考答案：D

第6题：

下列命令中,功能相同的是

A．DELETE ALL和PACK

B．DELETE ALL、ZAP和PACK

C．DELETE ALL、PACK和ZAP

D．DELETE ALL和RECALL ALL

正确答案：C
解析：本题考查了通过命令的方式删除表中记录的操作。DELETE ALL 、PACK和ZAP命令都是可以物理删除表中的全部记录,不管是否有删除标记。

第7题：

The villagers,()had been destroyed by the flood, were helped by the Red Cross.

A、all whose homes

B、all of their homes

C、all of whose homes

D、all their homes

参考答案：C

第8题：

Her sister did better than Elisabeth ________.

(A) in all sides

(B) on all sides

(D) on all side

正确答案：B
解答参考：本题考查短语on all sides “在各方面，到处”。【译文】伊丽莎白的姐姐各方面都做得比她好。

第9题：

_____________, we started looking for work.

A. Having been spent all the money

B. All the money having been spent

C. We spent all the money

D. All the money was spent

正确答案：B

第10题：

___ I’d like to welcome you to the conference.

A、All first

B、First of all

C、Of all the first

D、All of the first

参考答案：B

All the database&ensp

题目

参考答案和解析

相似问题和答案

更多相关问题

相关内容