Can a compound be a primary key?

Question

A compound primary key is made up of multiple fields and follows the requirements described in Primary Keys in Entities. To use a compound primary key, you must create a wrapper class. In order, two entities use compound primary keys: Part and LineItem .

How do you make a compound primary key?

To select more than one field to create a composite key, hold down CTRL and then click the row selector for each field. On the Design tab, in the Tools group, click Primary Key. A key indicator is added to the left of the field or fields that you specify as the primary key.

What is a compound primary key in SQL?

A primary key that is made by the combination of more than one attribute is known as a composite key. In other words we can say that: Composite key is a key which is the combination of more than one field or column of a given table. It may be a candidate key or primary key.

Can a foreign key be a compound?

A composite foreign key is a foreign key that consists of two or more columns. It is important to note that all the columns in a single foreign key must point to the same table.

Is a key a compound?

A compound key is similar to a composite key in that two or more fields are needed to create a unique value. However, a compound key is created when two or more primary keys from different tables are present as foreign keys within an entity. The foreign keys are used together to uniquely identify each record.

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