多选题You need to design the restrictions on the Bank.Customers table. Which three actions should you perform?()ADesign a trigger that verifies that the first names and surnames are not empty strings.BDesign a check constraint that verifies that the first names and surnames are not empty strings.CDesign 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.DDesign 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.EDesign 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.FDesign a trigger that ensures that the phone number cannot be changed from a valid format to a null value.

多选题
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.


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