Entity Integrity â Elements of a primary key: It must uniquely identify each record n the table It must contain unique values It cannot be null It can
{"Image DocumentName": "Entity Integrity Elements of a primary key:", "Image ImageDescription": "It must uniquely identify each record n the table. It must contain unique values. It cannot be null. It cannot be a multi-part field. It should contain the minimum number of fields necessary to define uniqueness. It is not optional whole or in part. It must directly identify the value of each field in the table. Its value can only be modified in rare or extreme cases. concatenated primary key.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}