Still, you can also specify the field you want as the primary key for your database table. The Primary key in Microsoft Access is a field or set of fields with unique values throughout the table.

When working on a multidimensional design, every fact table within scope should be handled with care. In an ideal world, each low-level fact table represents the metrics related to a business event.

You learned about primary keys in Part 2—a primary key uniquely identifies each record in a table. A foreign key is, simply put, one table’s primary key in another table.

One of the principles within relational theory is that each entity's row or tuple be uniquely identifiable. This means the defined structure includes some combination of attributes whose populated ...

Practical .NET Defining Columns, Primary, and Composite Keys in Entity Framework There are two attributes you can put on your entity class properties: one is a convenience, the other is essential, and ...

I'm adding a table and subclass table to my DB. (Subclass table = table where the primary key joins to the primary key of another table, to give extra row information to some subset of the rows ...

MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row with a standard INSERT statement, you will ...