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2.10 Consider the advisor relation shown in Figure 2.8 , with s_ id as the primary key of advisor.
Suppose a student can have more than one advisor. Then, would s _ id still be a primary key of
the advisor relation? If not, what should the primary key of advisor be? 2.14 List two reasons
why null values might be introduced into the database. Figure 2.8 Schema diagram for the
university database.

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