参照完整性规则包括更新规则、【 】和【 】。
参考答案：删除规则
解析：在Visual FoxPro中，参照完整性规则包括更新规则、删除规则和插入规则3种。
Read and judge. Amy在自制的日记本上记了一些事情，读一读并判断正(√)误 (×).
1. Amy's birthday is in June. ( )
2. Amy likes her new skirt very much. ( )
3. Jack likes cakes for dessert. ( )
4. Amy's favourite colour is green. ( )
5. Amy and her friends play at home. ( )
___________I am in trouble, my classmates will help me out.
A. Before B. Whenever C. Although
