What are some examples of functional dependency in databases?
An example of an AI chatbot conversation about functional dependency in databases.
What are some examples of functional dependency in databases?
Functional dependency is a relationship between attributes in a database. For example, if we have a table of students with attributes like StudentID and StudentName, we can say that StudentID functionally determines StudentName because each StudentID corresponds to exactly one StudentName.
Can you give me another example?
Sure! Consider a table of orders with attributes OrderID and CustomerID. Here, OrderID functionally determines CustomerID, meaning each OrderID is associated with one specific CustomerID.
What about composite keys? How do they relate to functional dependency?
Great question! In a composite key, multiple attributes together can determine another attribute. For instance, in a table with attributes CourseID and StudentID, the combination of these two can determine the EnrollmentDate.
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