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Describe the reason why it is acceptable to have null foreign key,but it is unacceptable to have a null primary key.Use the concept of entity integrity rule and referential integrity rule in your answer.
Daniel Levinson
A psychologist who proposed a widely recognized theory of adult development, which includes various stages and transitions throughout the lifespan.
Celibate
A person who abstains from marriage and sexual relations, often for religious or spiritual reasons.
Sexual Arousal
The physiological and emotional response to sexual stimulation, which can vary greatly among individuals.
Self-Esteem
An individual's subjective evaluation of their own worth, encompassing beliefs and emotions about oneself.
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