What is the primary key in the Books Table below?

What is the primary key in the Website Users table below?

What is the foreign key in Table 2?
What type of relationship exists between Table 1 and Table 2?
What is the foreign key that links the Profile table to the School table?

What is the primary key in Table 2?
Which field forms the one-to-many relationship between Table 1 and Table 2?
Which table is the cross-referencing table?
What is the foreign key that links the Employees table to the Departments table?

Which field in Table 1 forms the one-to-one relationship between Table 1 and Table 2?
What is the primary key in Table 2?
What type of relationship is formed between Table 3 and Table 1?
What type of relationship is formed between Table 3 and Table 2?
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