You can designate the primary key for a table by modifying the REST file. In the column object, add the #key after the data type element, separated by a comma. In the following example, the employeeID column has been designated the primary key for this table.
You an also create a composite primary key by using the #key element to designate multiple columns in a definition. For example, the values of the employeeID and position columns act as a composite key in the following:
