Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）A、UniqueB、CheckC、ReferentialD、Informational
题目
Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）
- A、Unique
- B、Check
- C、Referential
- D、Informational
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参考答案和解析
正确答案:B