​Which of the Following Statements About Creating Constraints Is Incorrect?​

question 123

Multiple Choice

​Which of the following statements about creating constraints is incorrect?​

• A) ​If a constraint applies to more than one column,the constraint must be created at the table level.
• B) ​Using the column level approach,the definition of the constraint is included as part of the column definition.
• C) ​When you create constraints at the column level,the constraint being created applies to the column specified.
• D) ​The NOT NULL constraint can be created at either the column level or the table level.

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