WAEC - Data Processing (2016 - No. 23)
A data element that uniquely identifies one record from the other in a table is the
Attribute key
determinant
entity key
primary key
설명
In DBMS, The primary key is the chosen key that uniquely identifies records in a table. It’s the one that’s used as the main identifier for each record.. There can be only one primary Key in a table. Also, the primary Key cannot have the same values repeating for any row.