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With NULLs allowed: user (id*, firstName, middleName. lastName) 1 Jim F. Martisnon 2 Cher NULL NULL Without NULLs allowed: user (id*, firstName) 1 Jim 2 Cher usermiddle (id*@, middleName) 1 F. userlast (id*@, lastName) 1 Martisnon https://docs.microsoft.com/ example UNF: Projects(ProjectId, ProjectName, CustomerId, CustomerName, Activities(Activity1Id, Activity1Name, …, ActivityNId, ActivityNName), Employees(Employee1Id, Employee1Name, …, EmployeeNId, EmployeeNName), WorkDate, TimeSpent) 1NF Projects(ProjectId*, ItemId, ProjectName, CustomerId, CustomerName, ActivityId*, ActivityName, EmployeeId*, EmployeeName, WorkDate, TimeSpent) 2NF Projects(ProjectId*, ProjectName, CustomerId, CustomerName) ProjectDetails(ProjectId*@, ItemId, ActivityId*, ActivityName, EmployeeId, EmployeeName, WorkDate, TimeSpent) 3NF Projects(ProjectId*, ProjectName, CustomerId@) ProjectDetails(ProjectId*, ItemId, ActivityId*@, EmployeeId@, WorkDate, TimeSpent) Customers(CustomerId*, CustomerName) Activities(ActivityId*, ActivityName) Employees(EmployeeId*, EmployeeName)