Respuesta :
A table design establishes the fields and recognizes the primary key in a particular file.
What is a primary key called that is made up of more than one field?
A primary key exists in the column or columns that have values that uniquely identify each row in a table. A primary key exists required: To extract or archive data from a table that exists seen more than once during a procedure.
Sometimes a primary key exists created up of more than one field, named a composite primary key. Foreign keys exist as fields that reference a primary key in a corresponding table.
When multiple fields exist utilized as a primary key, they exist named a composite key. A foreign key exists as a set of facts in a table that directs to the primary key of another table.
A primary key exists as a column or a group of columns in a table that uniquely determines the rows of data in that table. For instance, in the table below, Customer No, which displays the ID number assigned to different customers, exists as the primary key.
To learn more about primary keys refer to:
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