[多选] You need to design the restrictions on the Bank.Customers table. Which three actions should you perform?（）

A . Design a trigger that verifies that the first names and surnames are not empty strings.
B . Design a check constraint that verifies that the first names and surnames are not empty strings.
C . Design a check constraint that uses a CLR user-defined function to verify that either the phone number is a null value or the format of the phone number is valid.
D . Design a trigger that uses a CLR user-defined function to verify that either the phone number is a null value or the format of the phone number is valid.
E . Design a check constraint that ensures that the phone number cannot be changed from a valid format to a null value or to an invalid format.
F . Design a trigger that ensures that the phone number cannot be changed from a valid format to a null value.

Which of the following commands will display what space is used in /tmp filesystem?（） df -Ik /tmp。 df -fk /tmp。 df -Uk /tmp。 df -Fk /tm。淡豆沙色花泥是用来插（）和（）的。一台或两台高压泵未启动，持续（）反渗透停车 40秒。 30秒。 60秒。 You are using Resource Manager to manage system resources. While creating a new database user， you observe that the user is a member of DEFAULT_CONSUMER_GROUP by default. What would be the implications of this？（） The Resource Manager plan does not affect the user.。 There must be a plan directive in any of the plans of the group to control the resources.。 The members of the group DEFAULT_CONSUMER_GROUP always have resource restrictions.。 The members of DEFAULT_CONSUMER_GROUP are restrained from accessing the system tables.。 The members of this group can change their group without the database administrator’s intervention.。由某企业承建的某多功能现代化商务综合大厦，地上46层，地下3层，基础形式为桩基础，主体为全现浇钢筋混凝土框架一剪力墙结构.主体结构采用泵送混凝土等新技术。建筑物周边都十分接近规划红线，周边建筑及地下管线对因工程基坑开挖引起的地层变形移动十分敏感，且基坑北面临近地铁。在工程施工中发生如下事件：事件一：该工程地下室基坑开挖深度较大，为确保基坑开挖安全编制了专项施工方案，并由安全总监签字确认后实施。考虑到现场的复杂性，施工单位在施工过程中加强了基坑监测。事件二：根据施工情况，将混凝土墙体施工缝设置在地下室底板与墙体交接处。事件三：在进行基础工程桩基验收时，发现部分桩有颈缩现象，个别桩身发生断裂，施工单位及时作了处理，经重新验收全部合格。指出事件二中有哪些不妥之处，并说明理由。该施工缝应如何处理。 You need to design the restrictions on the Bank.Customers table. Which three actions should you perform?（）

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[多选] You need to design the restrictions on the Bank.Customers table. Which three actions should you perform?（）

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