中国大学MOOC: Which command is used to add attributes or constraints to an existing relation?
举一反三
- Which of the following are basic elements of the E-R model? A: Entities B: Attributes C: Relationships D: Constraints
- 中国大学MOOC: Which of the following is WRONG in the relation rules?
- 中国大学MOOC: ________is used to express the relation between a class and one or more detailed classes, i.e., the relation between “general” and “special”.
- Which command is used to display the collection of OSPF link states?
- 中国大学MOOC:"Which of the following could be used as a conclusion?";