Question: Sometimes besides primary key and foreign key constraints, you need to create other types of constraints in your database. What unique constraint and check

Sometimes besides primary key and foreign key constraints, you need to create other types of constraints in

Sometimes besides primary key and foreign key constraints, you need to create other types of constraints in your database. What unique constraint and check constraint should you create in your database? Why are they important? What index should you create in your database? Why is it important?

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